diff --git a/.github/workflows/ci_macos.yaml b/.github/workflows/ci_macos.yaml
index 5719960c9..df5ef3212 100644
--- a/.github/workflows/ci_macos.yaml
+++ b/.github/workflows/ci_macos.yaml
@@ -19,7 +19,7 @@ jobs:
       matrix:
         libt_version: ["2.0.9", "1.2.19"]
         qbt_gui: ["GUI=ON", "GUI=OFF"]
-        qt_version: ["5.15.2", "6.5.0"]
+        qt_version: ["6.5.0"]
         exclude:
           - libt_version: "1.2.19"
             qt_version: "6.5.0"
@@ -88,25 +88,6 @@ jobs:
           cmake --build build
           sudo cmake --install build
 
-      - name: Build qBittorrent (Qt5)
-        if: startsWith(matrix.qt_version, 5)
-        run: |
-          CXXFLAGS="$CXXFLAGS -Werror -Wno-error=deprecated-declarations" \
-          LDFLAGS="$LDFLAGS -gz" \
-          cmake \
-            -B build \
-            -G "Ninja" \
-            -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-            -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
-            -DBOOST_ROOT="${{ env.boost_path }}" \
-            -DOPENSSL_ROOT_DIR="${{ env.openssl_root }}" \
-            -DTESTING=ON \
-            -DVERBOSE_CONFIGURE=ON \
-            -D${{ matrix.qbt_gui }}
-          cmake --build build --target qbt_update_translations
-          cmake --build build
-          cmake --build build --target check
-
       - name: Build qBittorrent (Qt6)
         if: startsWith(matrix.qt_version, 6)
         run: |
@@ -119,7 +100,6 @@ jobs:
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
             -DBOOST_ROOT="${{ env.boost_path }}" \
             -DOPENSSL_ROOT_DIR="${{ env.openssl_root }}" \
-            -DQT6=ON \
             -DTESTING=ON \
             -DVERBOSE_CONFIGURE=ON \
             -D${{ matrix.qbt_gui }}
diff --git a/.github/workflows/ci_ubuntu.yaml b/.github/workflows/ci_ubuntu.yaml
index fcb7a58ce..e43521336 100644
--- a/.github/workflows/ci_ubuntu.yaml
+++ b/.github/workflows/ci_ubuntu.yaml
@@ -20,7 +20,7 @@ jobs:
       matrix:
         libt_version: ["2.0.9", "1.2.19"]
         qbt_gui: ["GUI=ON", "GUI=OFF"]
-        qt_version: ["5.15.2", "6.2.0"]
+        qt_version: ["6.2.0"]
         exclude:
           - libt_version: "1.2.19"
             qt_version: "6.2.0"
@@ -75,25 +75,6 @@ jobs:
           config-file: ./.github/workflows/helper/codeql/cpp.yaml
           languages: cpp
 
-      - name: Build qBittorrent (Qt5)
-        if: startsWith(matrix.qt_version, 5)
-        run: |
-          CXXFLAGS="$CXXFLAGS -Werror -Wno-error=deprecated-declarations" \
-          LDFLAGS="$LDFLAGS -gz" \
-          cmake \
-            -B build \
-            -G "Ninja" \
-            -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-            -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
-            -DCMAKE_INSTALL_PREFIX="/usr" \
-            -DTESTING=ON \
-            -DVERBOSE_CONFIGURE=ON \
-            -D${{ matrix.qbt_gui }}
-          cmake --build build --target qbt_update_translations
-          cmake --build build
-          cmake --build build --target check
-          DESTDIR="qbittorrent" cmake --install build
-
       - name: Build qBittorrent (Qt6)
         if: startsWith(matrix.qt_version, 6)
         run: |
@@ -105,7 +86,6 @@ jobs:
             -DCMAKE_BUILD_TYPE=RelWithDebInfo \
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
             -DCMAKE_INSTALL_PREFIX="/usr" \
-            -DQT6=ON \
             -DTESTING=ON \
             -DVERBOSE_CONFIGURE=ON \
             -D${{ matrix.qbt_gui }}
diff --git a/.github/workflows/ci_windows.yaml b/.github/workflows/ci_windows.yaml
index f7e310f60..8f12141a2 100644
--- a/.github/workflows/ci_windows.yaml
+++ b/.github/workflows/ci_windows.yaml
@@ -118,7 +118,6 @@ jobs:
             -DBOOST_ROOT="${{ env.boost_path }}" `
             -DLibtorrentRasterbar_DIR="${{ env.libtorrent_path }}/lib/cmake/LibtorrentRasterbar" `
             -DMSVC_RUNTIME_DYNAMIC=OFF `
-            -DQT6=ON `
             -DTESTING=ON `
             -DVCPKG_TARGET_TRIPLET=x64-windows-static-release `
             -DVERBOSE_CONFIGURE=ON `
diff --git a/.github/workflows/coverity-scan.yaml b/.github/workflows/coverity-scan.yaml
index b3fcace21..74b91dea8 100644
--- a/.github/workflows/coverity-scan.yaml
+++ b/.github/workflows/coverity-scan.yaml
@@ -62,7 +62,6 @@ jobs:
             -G "Ninja" \
             -DCMAKE_BUILD_TYPE=RelWithDebInfo \
             -DGUI=ON \
-            -DQT6=ON \
             -DVERBOSE_CONFIGURE=ON
           export PATH="$(pwd)/coverity_tool/bin:$PATH"
           cov-build --dir cov-int cmake --build build
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9a2712e62..e78fe8125 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,6 @@ project(qBittorrent
 
 # version requirements - older versions may work, but you are on your own
 set(minBoostVersion 1.71)
-set(minQt5Version 5.15.2)
 set(minQt6Version 6.2)
 set(minOpenSSLVersion 1.1.1)
 set(minLibtorrent1Version 1.2.19)
@@ -25,7 +24,6 @@ include(FeatureOptionsSetup)
 # features, list is loosely sorted by user's interests
 feature_option(GUI "Build GUI application" ON)
 feature_option(WEBUI "Enable built-in HTTP server for remote control" ON)
-feature_option(QT6 "Build with Qt 6 instead of Qt 5" OFF)
 feature_option(STACKTRACE "Enable stacktrace support" ON)
 feature_option(TESTING "Build internal testing suite" OFF)
 feature_option(VERBOSE_CONFIGURE "Show information about PACKAGES_FOUND and PACKAGES_NOT_FOUND in the configure output (only useful for debugging the CMake build scripts)" OFF)
diff --git a/INSTALL b/INSTALL
index 97cd5a9cf..e3169327a 100644
--- a/INSTALL
+++ b/INSTALL
@@ -11,7 +11,7 @@ qBittorrent - A BitTorrent client in C++ / Qt
 
   - OpenSSL >= 1.1.1
 
-  - Qt 5.15.2 - 5.x || 6.2.0 - 6.x
+  - Qt 6.2.0 - 6.x
 
   - zlib >= 1.2.11
 
diff --git a/cmake/Modules/CheckPackages.cmake b/cmake/Modules/CheckPackages.cmake
index 672cbd9d2..6c85b8d11 100644
--- a/cmake/Modules/CheckPackages.cmake
+++ b/cmake/Modules/CheckPackages.cmake
@@ -46,22 +46,11 @@ set_property(CACHE LibtorrentRasterbar_DIR PROPERTY TYPE PATH)
 find_package(Boost ${minBoostVersion} REQUIRED)
 find_package(OpenSSL ${minOpenSSLVersion} REQUIRED)
 find_package(ZLIB ${minZlibVersion} REQUIRED)
-if (QT6)
-    find_package(Qt6 ${minQt6Version} REQUIRED COMPONENTS Core Network Sql Xml LinguistTools)
-    if (DBUS)
-        find_package(Qt6 ${minQt6Version} REQUIRED COMPONENTS DBus)
-        set_package_properties(Qt6DBus PROPERTIES
-            DESCRIPTION "Qt6 module for inter-process communication over the D-Bus protocol"
-            PURPOSE "Required by the DBUS feature"
-        )
-    endif()
-else()
-    find_package(Qt5 ${minQt5Version} REQUIRED COMPONENTS Core Network Sql Xml LinguistTools)
-    if (DBUS)
-        find_package(Qt5 ${minQt5Version} REQUIRED COMPONENTS DBus)
-        set_package_properties(Qt5DBus PROPERTIES
-            DESCRIPTION "Qt5 module for inter-process communication over the D-Bus protocol"
-            PURPOSE "Required by the DBUS feature"
-        )
-    endif()
+find_package(Qt6 ${minQt6Version} REQUIRED COMPONENTS Core Network Sql Xml LinguistTools)
+if (DBUS)
+    find_package(Qt6 ${minQt6Version} REQUIRED COMPONENTS DBus)
+    set_package_properties(Qt6DBus PROPERTIES
+        DESCRIPTION "Qt6 module for inter-process communication over the D-Bus protocol"
+        PURPOSE "Required by the DBUS feature"
+    )
 endif()
diff --git a/src/app/application.cpp b/src/app/application.cpp
index 6abe0bdaa..0fcc14d87 100644
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@@ -248,9 +248,6 @@ Application::Application(int &argc, char **argv)
     setOrganizationDomain(u"qbittorrent.org"_s);
 #if !defined(DISABLE_GUI)
     setDesktopFileName(u"org.qbittorrent.qBittorrent"_s);
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-    setAttribute(Qt::AA_UseHighDpiPixmaps, true);  // opt-in to the high DPI pixmap support
-#endif
     setQuitOnLastWindowClosed(false);
     QPixmapCache::setCacheLimit(PIXMAP_CACHE_SIZE);
 #endif
@@ -1037,11 +1034,15 @@ void Application::initializeTranslation()
     // Load translation
     const QString localeStr = pref->getLocale();
 
-    if (m_qtTranslator.load((u"qtbase_" + localeStr), QLibraryInfo::location(QLibraryInfo::TranslationsPath)) ||
-        m_qtTranslator.load((u"qt_" + localeStr), QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
-            qDebug("Qt %s locale recognized, using translation.", qUtf8Printable(localeStr));
+    if (m_qtTranslator.load((u"qtbase_" + localeStr), QLibraryInfo::path(QLibraryInfo::TranslationsPath))
+            || m_qtTranslator.load((u"qt_" + localeStr), QLibraryInfo::path(QLibraryInfo::TranslationsPath)))
+    {
+        qDebug("Qt %s locale recognized, using translation.", qUtf8Printable(localeStr));
+    }
     else
+    {
         qDebug("Qt %s locale unrecognized, using default (en).", qUtf8Printable(localeStr));
+    }
 
     installTranslator(&m_qtTranslator);
 
diff --git a/src/app/filelogger.cpp b/src/app/filelogger.cpp
index e13beb7c9..e0cafbb7e 100644
--- a/src/app/filelogger.cpp
+++ b/src/app/filelogger.cpp
@@ -127,9 +127,6 @@ void FileLogger::addLogMessage(const Log::Msg &msg)
     if (!m_logFile.isOpen()) return;
 
     QTextStream stream(&m_logFile);
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-    stream.setCodec("UTF-8");
-#endif
 
     switch (msg.type)
     {
diff --git a/src/app/main.cpp b/src/app/main.cpp
index 1e95075f4..a9e29f86d 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -105,15 +105,6 @@ int main(int argc, char *argv[])
     // We must save it here because QApplication constructor may change it
     bool isOneArg = (argc == 2);
 
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)) && !defined(DISABLE_GUI)
-    // Attribute Qt::AA_EnableHighDpiScaling must be set before QCoreApplication is created
-    if (qgetenv("QT_ENABLE_HIGHDPI_SCALING").isEmpty() && qgetenv("QT_AUTO_SCREEN_SCALE_FACTOR").isEmpty())
-        Application::setAttribute(Qt::AA_EnableHighDpiScaling, true);
-    // HighDPI scale factor policy must be set before QGuiApplication is created
-    if (qgetenv("QT_SCALE_FACTOR_ROUNDING_POLICY").isEmpty())
-        Application::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
-#endif
-
     try
     {
         // Create Application
@@ -212,10 +203,6 @@ int main(int argc, char *argv[])
         // 3. https://bugreports.qt.io/browse/QTBUG-46015
 
         qputenv("QT_BEARER_POLL_TIMEOUT", QByteArray::number(-1));
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)) && !defined(DISABLE_GUI)
-        // this is the default in Qt6
-        app->setAttribute(Qt::AA_DisableWindowContextHelpButton);
-#endif
 #endif // Q_OS_WIN
 
 #ifdef Q_OS_MACOS
diff --git a/src/base/CMakeLists.txt b/src/base/CMakeLists.txt
index 2403c2e11..4265c5aa8 100644
--- a/src/base/CMakeLists.txt
+++ b/src/base/CMakeLists.txt
@@ -20,7 +20,6 @@ add_library(qbt_base STATIC
     bittorrent/infohash.h
     bittorrent/loadtorrentparams.h
     bittorrent/ltqbitarray.h
-    bittorrent/ltqhash.h
     bittorrent/lttypecast.h
     bittorrent/magneturi.h
     bittorrent/nativesessionextension.h
diff --git a/src/base/bittorrent/customstorage.h b/src/base/bittorrent/customstorage.h
index facbea6df..ad91b7cf7 100644
--- a/src/base/bittorrent/customstorage.h
+++ b/src/base/bittorrent/customstorage.h
@@ -41,8 +41,6 @@
 #include <libtorrent/io_context.hpp>
 
 #include <QHash>
-
-#include "ltqhash.h"
 #else
 #include <libtorrent/storage.hpp>
 #endif
diff --git a/src/base/bittorrent/dbresumedatastorage.cpp b/src/base/bittorrent/dbresumedatastorage.cpp
index cd360aef0..2801522ac 100644
--- a/src/base/bittorrent/dbresumedatastorage.cpp
+++ b/src/base/bittorrent/dbresumedatastorage.cpp
@@ -848,7 +848,7 @@ namespace
             query.bindValue(DB_COLUMN_NAME.placeholder, m_resumeData.name);
             query.bindValue(DB_COLUMN_CATEGORY.placeholder, m_resumeData.category);
             query.bindValue(DB_COLUMN_TAGS.placeholder, (m_resumeData.tags.isEmpty()
-                    ? QVariant(QVariant::String) : m_resumeData.tags.join(u","_s)));
+                    ? QString() : m_resumeData.tags.join(u","_s)));
             query.bindValue(DB_COLUMN_CONTENT_LAYOUT.placeholder, Utils::String::fromEnum(m_resumeData.contentLayout));
             query.bindValue(DB_COLUMN_RATIO_LIMIT.placeholder, static_cast<int>(m_resumeData.ratioLimit * 1000));
             query.bindValue(DB_COLUMN_SEEDING_TIME_LIMIT.placeholder, m_resumeData.seedingTimeLimit);
diff --git a/src/base/bittorrent/infohash.cpp b/src/base/bittorrent/infohash.cpp
index e4ee0f08d..1a6035353 100644
--- a/src/base/bittorrent/infohash.cpp
+++ b/src/base/bittorrent/infohash.cpp
@@ -111,11 +111,7 @@ BitTorrent::TorrentID BitTorrent::TorrentID::fromSHA256Hash(const SHA256Hash &ha
     return BaseType::UnderlyingType(static_cast<typename SHA256Hash::UnderlyingType>(hash).data());
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 std::size_t BitTorrent::qHash(const BitTorrent::TorrentID &key, const std::size_t seed)
-#else
-uint BitTorrent::qHash(const BitTorrent::TorrentID &key, const uint seed)
-#endif
 {
     return ::qHash(static_cast<TorrentID::BaseType>(key), seed);
 }
diff --git a/src/base/bittorrent/infohash.h b/src/base/bittorrent/infohash.h
index 0c69e37d4..fa033d0ae 100644
--- a/src/base/bittorrent/infohash.h
+++ b/src/base/bittorrent/infohash.h
@@ -87,11 +87,7 @@ namespace BitTorrent
         WrappedType m_nativeHash;
     };
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(const TorrentID &key, std::size_t seed = 0);
-#else
-    uint qHash(const TorrentID &key, uint seed = 0);
-#endif
 
     bool operator==(const InfoHash &left, const InfoHash &right);
     bool operator!=(const InfoHash &left, const InfoHash &right);
diff --git a/src/base/bittorrent/ltqhash.h b/src/base/bittorrent/ltqhash.h
deleted file mode 100644
index b8a929b32..000000000
--- a/src/base/bittorrent/ltqhash.h
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Bittorrent Client using Qt and libtorrent.
- * Copyright (C) 2020  Vladimir Golovnev <glassez@yandex.ru>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- *
- * In addition, as a special exception, the copyright holders give permission to
- * link this program with the OpenSSL project's "OpenSSL" library (or with
- * modified versions of it that use the same license as the "OpenSSL" library),
- * and distribute the linked executables. You must obey the GNU General Public
- * License in all respects for all of the code used other than "OpenSSL".  If you
- * modify file(s), you may extend this exception to your version of the file(s),
- * but you are not obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- */
-
-#pragma once
-
-#include <QtGlobal>
-
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-#include <functional>
-
-#include <libtorrent/units.hpp>
-
-#include <QHash>
-
-namespace libtorrent
-{
-    namespace aux
-    {
-        template <typename T, typename Tag>
-        uint qHash(const strong_typedef<T, Tag> &key, const uint seed = 0)
-        {
-            return ::qHash((std::hash<strong_typedef<T, Tag>> {})(key), seed);
-        }
-    }
-}
-#endif
diff --git a/src/base/bittorrent/peeraddress.cpp b/src/base/bittorrent/peeraddress.cpp
index acaf7bd9d..1d05ef92f 100644
--- a/src/base/bittorrent/peeraddress.cpp
+++ b/src/base/bittorrent/peeraddress.cpp
@@ -77,14 +77,7 @@ bool BitTorrent::operator==(const BitTorrent::PeerAddress &left, const BitTorren
     return (left.ip == right.ip) && (left.port == right.port);
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 std::size_t BitTorrent::qHash(const BitTorrent::PeerAddress &addr, const std::size_t seed)
 {
     return qHashMulti(seed, addr.ip, addr.port);
 }
-#else
-uint BitTorrent::qHash(const BitTorrent::PeerAddress &addr, const uint seed)
-{
-    return (::qHash(addr.ip, seed) ^ ::qHash(addr.port));
-}
-#endif
diff --git a/src/base/bittorrent/peeraddress.h b/src/base/bittorrent/peeraddress.h
index 9f1e7d0a7..46e6de15c 100644
--- a/src/base/bittorrent/peeraddress.h
+++ b/src/base/bittorrent/peeraddress.h
@@ -45,9 +45,5 @@ namespace BitTorrent
     };
 
     bool operator==(const PeerAddress &left, const PeerAddress &right);
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(const PeerAddress &addr, std::size_t seed = 0);
-#else
-    uint qHash(const PeerAddress &addr, uint seed = 0);
-#endif
 }
diff --git a/src/base/bittorrent/sessionimpl.cpp b/src/base/bittorrent/sessionimpl.cpp
index e021a5453..a6c2efb07 100644
--- a/src/base/bittorrent/sessionimpl.cpp
+++ b/src/base/bittorrent/sessionimpl.cpp
@@ -66,9 +66,6 @@
 #include <QJsonObject>
 #include <QJsonValue>
 #include <QNetworkAddressEntry>
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-#include <QNetworkConfigurationManager>
-#endif
 #include <QNetworkInterface>
 #include <QRegularExpression>
 #include <QString>
@@ -118,24 +115,6 @@ const Path CATEGORIES_FILE_NAME {u"categories.json"_s};
 const int MAX_PROCESSING_RESUMEDATA_COUNT = 50;
 const int STATISTICS_SAVE_INTERVAL = std::chrono::milliseconds(15min).count();
 
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-namespace std
-{
-    uint qHash(const std::string &key, uint seed = 0)
-    {
-        return ::qHash(std::hash<std::string> {}(key), seed);
-    }
-}
-
-namespace libtorrent
-{
-    uint qHash(const libtorrent::torrent_handle &key)
-    {
-        return static_cast<uint>(libtorrent::hash_value(key));
-    }
-}
-#endif
-
 namespace
 {
     const char PEER_ID[] = "qB";
@@ -537,9 +516,6 @@ SessionImpl::SessionImpl(QObject *parent)
     , m_ioThread {new QThread}
     , m_asyncWorker {new QThreadPool(this)}
     , m_recentErroredTorrentsTimer {new QTimer(this)}
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-    , m_networkManager {new QNetworkConfigurationManager(this)}
-#endif
 {
     // It is required to perform async access to libtorrent sequentially
     m_asyncWorker->setMaxThreadCount(1);
@@ -580,14 +556,6 @@ SessionImpl::SessionImpl(QObject *parent)
         , &Net::ProxyConfigurationManager::proxyConfigurationChanged
         , this, &SessionImpl::configureDeferred);
 
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-    // Network configuration monitor
-    connect(m_networkManager, &QNetworkConfigurationManager::onlineStateChanged, this, &SessionImpl::networkOnlineStateChanged);
-    connect(m_networkManager, &QNetworkConfigurationManager::configurationAdded, this, &SessionImpl::networkConfigurationChange);
-    connect(m_networkManager, &QNetworkConfigurationManager::configurationRemoved, this, &SessionImpl::networkConfigurationChange);
-    connect(m_networkManager, &QNetworkConfigurationManager::configurationChanged, this, &SessionImpl::networkConfigurationChange);
-#endif
-
     m_fileSearcher = new FileSearcher;
     m_fileSearcher->moveToThread(m_ioThread.get());
     connect(m_ioThread.get(), &QThread::finished, m_fileSearcher, &QObject::deleteLater);
@@ -3148,13 +3116,7 @@ void SessionImpl::saveResumeData()
 
     // clear queued storage move jobs except the current ongoing one
     if (m_moveStorageQueue.size() > 1)
-    {
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-        m_moveStorageQueue = m_moveStorageQueue.mid(0, 1);
-#else
         m_moveStorageQueue.resize(1);
-#endif
-    }
 
     QElapsedTimer timer;
     timer.start();
@@ -3277,29 +3239,6 @@ void SessionImpl::setDownloadPath(const Path &path)
         torrent->handleCategoryOptionsChanged();
 }
 
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-void SessionImpl::networkOnlineStateChanged(const bool online)
-{
-    LogMsg(tr("System network status changed to %1", "e.g: System network status changed to ONLINE").arg(online ? tr("ONLINE") : tr("OFFLINE")), Log::INFO);
-}
-
-void SessionImpl::networkConfigurationChange(const QNetworkConfiguration &cfg)
-{
-    const QString configuredInterfaceName = networkInterface();
-    // Empty means "Any Interface". In this case libtorrent has binded to 0.0.0.0 so any change to any interface will
-    // be automatically picked up. Otherwise we would rebinding here to 0.0.0.0 again.
-    if (configuredInterfaceName.isEmpty()) return;
-
-    const QString changedInterface = cfg.name();
-
-    if (configuredInterfaceName == changedInterface)
-    {
-        LogMsg(tr("Network configuration of %1 has changed, refreshing session binding", "e.g: Network configuration of tun0 has changed, refreshing session binding").arg(changedInterface), Log::INFO);
-        configureListeningInterface();
-    }
-}
-#endif
-
 QStringList SessionImpl::getListeningIPs() const
 {
     QStringList IPs;
@@ -6201,12 +6140,8 @@ void SessionImpl::processTrackerStatuses()
 
                         const QMap<TrackerEntry::Endpoint, int> &updateInfo = updatedTrackersIter.value();
                         TrackerEntry trackerEntry = torrent->updateTrackerEntry(announceEntry, updateInfo);
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-                        updatedTrackerEntries[trackerEntry.url] = std::move(trackerEntry);
-#else
                         const QString url = trackerEntry.url;
                         updatedTrackerEntries.emplace(url, std::move(trackerEntry));
-#endif
                     }
 
                     emit trackerEntriesUpdated(torrent, updatedTrackerEntries);
diff --git a/src/base/bittorrent/sessionimpl.h b/src/base/bittorrent/sessionimpl.h
index f75879019..b6222160c 100644
--- a/src/base/bittorrent/sessionimpl.h
+++ b/src/base/bittorrent/sessionimpl.h
@@ -57,10 +57,6 @@
 #include "torrentinfo.h"
 #include "trackerentry.h"
 
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-class QNetworkConfiguration;
-class QNetworkConfigurationManager;
-#endif
 class QString;
 class QThread;
 class QThreadPool;
@@ -486,12 +482,6 @@ namespace BitTorrent
         void handleDownloadFinished(const Net::DownloadResult &result);
         void fileSearchFinished(const TorrentID &id, const Path &savePath, const PathList &fileNames);
 
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-        // Session reconfiguration triggers
-        void networkOnlineStateChanged(bool online);
-        void networkConfigurationChange(const QNetworkConfiguration &);
-#endif
-
     private:
         struct ResumeSessionContext;
 
@@ -778,9 +768,6 @@ namespace BitTorrent
 
         SessionStatus m_status;
         CacheStatus m_cacheStatus;
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-        QNetworkConfigurationManager *m_networkManager = nullptr;
-#endif
 
         QList<MoveStorageJob> m_moveStorageQueue;
 
diff --git a/src/base/bittorrent/torrent.cpp b/src/base/bittorrent/torrent.cpp
index 7df2d8dc3..c9ed27bfb 100644
--- a/src/base/bittorrent/torrent.cpp
+++ b/src/base/bittorrent/torrent.cpp
@@ -35,11 +35,7 @@
 
 namespace BitTorrent
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(const TorrentState key, const std::size_t seed)
-#else
-    uint qHash(const TorrentState key, const uint seed)
-#endif
     {
         return ::qHash(static_cast<std::underlying_type_t<TorrentState>>(key), seed);
     }
diff --git a/src/base/bittorrent/torrent.h b/src/base/bittorrent/torrent.h
index 49a332515..80e22b77a 100644
--- a/src/base/bittorrent/torrent.h
+++ b/src/base/bittorrent/torrent.h
@@ -100,11 +100,7 @@ namespace BitTorrent
         Error
     };
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(TorrentState key, std::size_t seed = 0);
-#else
-    uint qHash(TorrentState key, uint seed = 0);
-#endif
 
     class Torrent : public TorrentContentHandler
     {
diff --git a/src/base/bittorrent/torrentimpl.cpp b/src/base/bittorrent/torrentimpl.cpp
index 86a4e1147..c66565409 100644
--- a/src/base/bittorrent/torrentimpl.cpp
+++ b/src/base/bittorrent/torrentimpl.cpp
@@ -62,7 +62,6 @@
 #include "extensiondata.h"
 #include "loadtorrentparams.h"
 #include "ltqbitarray.h"
-#include "ltqhash.h"
 #include "lttypecast.h"
 #include "peeraddress.h"
 #include "peerinfo.h"
diff --git a/src/base/bittorrent/tracker.cpp b/src/base/bittorrent/tracker.cpp
index a42e285dc..eb6f5606b 100644
--- a/src/base/bittorrent/tracker.cpp
+++ b/src/base/bittorrent/tracker.cpp
@@ -140,11 +140,7 @@ namespace BitTorrent
         return !(left == right);
     }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(const Peer &key, const std::size_t seed)
-#else
-    uint qHash(const Peer &key, const uint seed)
-#endif
     {
         return qHash(key.uniqueID(), seed);
     }
diff --git a/src/base/bittorrent/tracker.h b/src/base/bittorrent/tracker.h
index bc9de5edc..6a54ca3a9 100644
--- a/src/base/bittorrent/tracker.h
+++ b/src/base/bittorrent/tracker.h
@@ -65,11 +65,7 @@ namespace BitTorrent
 
     bool operator==(const Peer &left, const Peer &right);
     bool operator!=(const Peer &left, const Peer &right);
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(const Peer &key, std::size_t seed = 0);
-#else
-    uint qHash(const Peer &key, uint seed = 0);
-#endif
 
     // *Basic* Bittorrent tracker implementation
     // [BEP-3] The BitTorrent Protocol Specification
diff --git a/src/base/bittorrent/trackerentry.cpp b/src/base/bittorrent/trackerentry.cpp
index 5521c63d3..776053911 100644
--- a/src/base/bittorrent/trackerentry.cpp
+++ b/src/base/bittorrent/trackerentry.cpp
@@ -61,11 +61,7 @@ bool BitTorrent::operator==(const TrackerEntry &left, const TrackerEntry &right)
     return (left.url == right.url);
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 std::size_t BitTorrent::qHash(const TrackerEntry &key, const std::size_t seed)
-#else
-uint BitTorrent::qHash(const TrackerEntry &key, const uint seed)
-#endif
 {
     return ::qHash(key.url, seed);
 }
diff --git a/src/base/bittorrent/trackerentry.h b/src/base/bittorrent/trackerentry.h
index fc933e82f..502a8b096 100644
--- a/src/base/bittorrent/trackerentry.h
+++ b/src/base/bittorrent/trackerentry.h
@@ -79,9 +79,5 @@ namespace BitTorrent
     QVector<TrackerEntry> parseTrackerEntries(QStringView str);
 
     bool operator==(const TrackerEntry &left, const TrackerEntry &right);
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(const TrackerEntry &key, std::size_t seed = 0);
-#else
-    uint qHash(const TrackerEntry &key, uint seed = 0);
-#endif
 }
diff --git a/src/base/digest32.h b/src/base/digest32.h
index b1c903c62..11c0c314b 100644
--- a/src/base/digest32.h
+++ b/src/base/digest32.h
@@ -157,16 +157,8 @@ bool operator<(const Digest32<N> &left, const Digest32<N> &right)
             < static_cast<typename Digest32<N>::UnderlyingType>(right);
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 template <int N>
 std::size_t qHash(const Digest32<N> &key, const std::size_t seed = 0)
 {
     return ::qHash(static_cast<typename Digest32<N>::UnderlyingType>(key), seed);
 }
-#else
-template <int N>
-uint qHash(const Digest32<N> &key, const uint seed = 0)
-{
-    return ::qHash(std::hash<typename Digest32<N>::UnderlyingType> {}(key), seed);
-}
-#endif
diff --git a/src/base/global.h b/src/base/global.h
index fde7984be..5e38af844 100644
--- a/src/base/global.h
+++ b/src/base/global.h
@@ -50,11 +50,7 @@ void asConst(const T &&) = delete;
 // https://doc.qt.io/qt-6/qstring.html#operator-22-22_s
 inline QString operator"" _s(const char16_t *str, const std::size_t size)
 {
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-    return QString::fromRawData(reinterpret_cast<const QChar *>(str), static_cast<int>(size));
-#else
     return operator""_qs(str, size);
-#endif
 }
 #else
 using namespace Qt::Literals::StringLiterals;
diff --git a/src/base/net/downloadmanager.cpp b/src/base/net/downloadmanager.cpp
index 7669af79f..82c3fb143 100644
--- a/src/base/net/downloadmanager.cpp
+++ b/src/base/net/downloadmanager.cpp
@@ -376,17 +376,10 @@ Net::ServiceID Net::ServiceID::fromURL(const QUrl &url)
     return {url.host(), url.port(80)};
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 std::size_t Net::qHash(const ServiceID &serviceID, const std::size_t seed)
 {
     return qHashMulti(seed, serviceID.hostName, serviceID.port);
 }
-#else
-uint Net::qHash(const ServiceID &serviceID, const uint seed)
-{
-    return ::qHash(serviceID.hostName, seed) ^ ::qHash(serviceID.port);
-}
-#endif
 
 bool Net::operator==(const ServiceID &lhs, const ServiceID &rhs)
 {
diff --git a/src/base/net/downloadmanager.h b/src/base/net/downloadmanager.h
index faf636ba6..441780bd1 100644
--- a/src/base/net/downloadmanager.h
+++ b/src/base/net/downloadmanager.h
@@ -54,11 +54,7 @@ namespace Net
         static ServiceID fromURL(const QUrl &url);
     };
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     std::size_t qHash(const ServiceID &serviceID, std::size_t seed = 0);
-#else
-    uint qHash(const ServiceID &serviceID, uint seed = 0);
-#endif
     bool operator==(const ServiceID &lhs, const ServiceID &rhs);
 
     enum class DownloadStatus
diff --git a/src/base/net/geoipdatabase.cpp b/src/base/net/geoipdatabase.cpp
index 7117742cb..12f00efcf 100644
--- a/src/base/net/geoipdatabase.cpp
+++ b/src/base/net/geoipdatabase.cpp
@@ -484,7 +484,7 @@ QVariant GeoIPDatabase::readMapValue(quint32 &offset, const quint32 count) const
 
         const QString key = field.toString();
         field = readDataField(offset);
-        if (field.userType() == QVariant::Invalid)
+        if (field.userType() == QMetaType::UnknownType)
             return {};
 
         map[key] = field;
@@ -500,7 +500,7 @@ QVariant GeoIPDatabase::readArrayValue(quint32 &offset, const quint32 count) con
     for (quint32 i = 0; i < count; ++i)
     {
         const QVariant field = readDataField(offset);
-        if (field.userType() == QVariant::Invalid)
+        if (field.userType() == QMetaType::UnknownType)
             return {};
 
         array.append(field);
diff --git a/src/base/path.cpp b/src/base/path.cpp
index 5ec30549d..75bf074ed 100644
--- a/src/base/path.cpp
+++ b/src/base/path.cpp
@@ -377,11 +377,7 @@ QDataStream &operator>>(QDataStream &in, Path &path)
     return in;
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 std::size_t qHash(const Path &key, const std::size_t seed)
-#else
-uint qHash(const Path &key, const uint seed)
-#endif
 {
     return ::qHash(key.data(), seed);
 }
diff --git a/src/base/path.h b/src/base/path.h
index 1b9e95198..16bf51f71 100644
--- a/src/base/path.h
+++ b/src/base/path.h
@@ -101,8 +101,4 @@ Path operator+(const Path &lhs, QStringView rhs);
 QDataStream &operator<<(QDataStream &out, const Path &path);
 QDataStream &operator>>(QDataStream &in, Path &path);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 std::size_t qHash(const Path &key, std::size_t seed = 0);
-#else
-uint qHash(const Path &key, uint seed = 0);
-#endif
diff --git a/src/base/preferences.cpp b/src/base/preferences.cpp
index 331983640..fe5addf6e 100644
--- a/src/base/preferences.cpp
+++ b/src/base/preferences.cpp
@@ -1671,11 +1671,7 @@ void Preferences::setMainLastDir(const Path &path)
 
 QByteArray Preferences::getPeerListState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     return value<QByteArray>(u"GUI/Qt6/TorrentProperties/PeerListState"_s);
-#else
-    return value<QByteArray>(u"TorrentProperties/Peers/qt5/PeerListState"_s);
-#endif
 }
 
 void Preferences::setPeerListState(const QByteArray &state)
@@ -1683,11 +1679,7 @@ void Preferences::setPeerListState(const QByteArray &state)
     if (state == getPeerListState())
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     setValue(u"GUI/Qt6/TorrentProperties/PeerListState"_s, state);
-#else
-    setValue(u"TorrentProperties/Peers/qt5/PeerListState"_s, state);
-#endif
 }
 
 QString Preferences::getPropSplitterSizes() const
@@ -1705,11 +1697,7 @@ void Preferences::setPropSplitterSizes(const QString &sizes)
 
 QByteArray Preferences::getPropFileListState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     return value<QByteArray>(u"GUI/Qt6/TorrentProperties/FilesListState"_s);
-#else
-    return value<QByteArray>(u"TorrentProperties/qt5/FilesListState"_s);
-#endif
 }
 
 void Preferences::setPropFileListState(const QByteArray &state)
@@ -1717,11 +1705,7 @@ void Preferences::setPropFileListState(const QByteArray &state)
     if (state == getPropFileListState())
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     setValue(u"GUI/Qt6/TorrentProperties/FilesListState"_s, state);
-#else
-    setValue(u"TorrentProperties/qt5/FilesListState"_s, state);
-#endif
 }
 
 int Preferences::getPropCurTab() const
@@ -1752,11 +1736,7 @@ void Preferences::setPropVisible(const bool visible)
 
 QByteArray Preferences::getPropTrackerListState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     return value<QByteArray>(u"GUI/Qt6/TorrentProperties/TrackerListState"_s);
-#else
-    return value<QByteArray>(u"TorrentProperties/Trackers/qt5/TrackerListState"_s);
-#endif
 }
 
 void Preferences::setPropTrackerListState(const QByteArray &state)
@@ -1764,11 +1744,7 @@ void Preferences::setPropTrackerListState(const QByteArray &state)
     if (state == getPropTrackerListState())
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     setValue(u"GUI/Qt6/TorrentProperties/TrackerListState"_s, state);
-#else
-    setValue(u"TorrentProperties/Trackers/qt5/TrackerListState"_s, state);
-#endif
 }
 
 QStringList Preferences::getRssOpenFolders() const
@@ -1786,11 +1762,7 @@ void Preferences::setRssOpenFolders(const QStringList &folders)
 
 QByteArray Preferences::getRssSideSplitterState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     return value<QByteArray>(u"GUI/Qt6/RSSWidget/SideSplitterState"_s);
-#else
-    return value<QByteArray>(u"GUI/RSSWidget/qt5/splitter_h"_s);
-#endif
 }
 
 void Preferences::setRssSideSplitterState(const QByteArray &state)
@@ -1798,20 +1770,12 @@ void Preferences::setRssSideSplitterState(const QByteArray &state)
     if (state == getRssSideSplitterState())
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     setValue(u"GUI/Qt6/RSSWidget/SideSplitterState"_s, state);
-#else
-    setValue(u"GUI/RSSWidget/qt5/splitter_h"_s, state);
-#endif
 }
 
 QByteArray Preferences::getRssMainSplitterState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     return value<QByteArray>(u"GUI/Qt6/RSSWidget/MainSplitterState"_s);
-#else
-    return value<QByteArray>(u"GUI/RSSWidget/qt5/splitterMain"_s);
-#endif
 }
 
 void Preferences::setRssMainSplitterState(const QByteArray &state)
@@ -1819,20 +1783,12 @@ void Preferences::setRssMainSplitterState(const QByteArray &state)
     if (state == getRssMainSplitterState())
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     setValue(u"GUI/Qt6/RSSWidget/MainSplitterState"_s, state);
-#else
-    setValue(u"GUI/RSSWidget/qt5/splitterMain"_s, state);
-#endif
 }
 
 QByteArray Preferences::getSearchTabHeaderState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     return value<QByteArray>(u"GUI/Qt6/SearchTab/HeaderState"_s);
-#else
-    return value<QByteArray>(u"SearchTab/qt5/HeaderState"_s);
-#endif
 }
 
 void Preferences::setSearchTabHeaderState(const QByteArray &state)
@@ -1840,11 +1796,7 @@ void Preferences::setSearchTabHeaderState(const QByteArray &state)
     if (state == getSearchTabHeaderState())
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     setValue(u"GUI/Qt6/SearchTab/HeaderState"_s, state);
-#else
-    setValue(u"SearchTab/qt5/HeaderState"_s, state);
-#endif
 }
 
 bool Preferences::getRegexAsFilteringPatternForSearchJob() const
@@ -1979,11 +1931,7 @@ void Preferences::setHideZeroStatusFilters(const bool hide)
 
 QByteArray Preferences::getTransHeaderState() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     return value<QByteArray>(u"GUI/Qt6/TransferList/HeaderState"_s);
-#else
-    return value<QByteArray>(u"TransferList/qt5/HeaderState"_s);
-#endif
 }
 
 void Preferences::setTransHeaderState(const QByteArray &state)
@@ -1991,11 +1939,7 @@ void Preferences::setTransHeaderState(const QByteArray &state)
     if (state == getTransHeaderState())
         return;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     setValue(u"GUI/Qt6/TransferList/HeaderState"_s, state);
-#else
-    setValue(u"TransferList/qt5/HeaderState"_s, state);
-#endif
 }
 
 bool Preferences::getRegexAsFilteringPatternForTransferList() const
diff --git a/src/base/settingsstorage.cpp b/src/base/settingsstorage.cpp
index b4bbd9605..ed8f03b0d 100644
--- a/src/base/settingsstorage.cpp
+++ b/src/base/settingsstorage.cpp
@@ -212,11 +212,7 @@ bool SettingsStorage::writeNativeSettings() const
 void SettingsStorage::removeValue(const QString &key)
 {
     const QWriteLocker locker(&m_lock);
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     if (m_data.remove(key))
-#else
-    if (m_data.remove(key) > 0)
-#endif
     {
         m_dirty = true;
         m_timer.start();
diff --git a/src/base/torrentfileswatcher.cpp b/src/base/torrentfileswatcher.cpp
index 7015a293d..d645be135 100644
--- a/src/base/torrentfileswatcher.cpp
+++ b/src/base/torrentfileswatcher.cpp
@@ -233,7 +233,7 @@ void TorrentFilesWatcher::loadLegacy()
     {
         const Path watchedFolder {it.key()};
         BitTorrent::AddTorrentParams params;
-        if (it.value().type() == QVariant::Int)
+        if (it.value().userType() == QMetaType::Int)
         {
             if (it.value().toInt() == 0)
             {
diff --git a/src/base/utils/string.cpp b/src/base/utils/string.cpp
index 4301c1c22..4f3cebb9b 100644
--- a/src/base/utils/string.cpp
+++ b/src/base/utils/string.cpp
@@ -32,15 +32,10 @@
 #include <cmath>
 
 #include <QLocale>
+#include <QRegularExpression>
 #include <QStringList>
 #include <QVector>
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
-#include <QRegularExpression>
-#else
-#include <QRegExp>
-#endif
-
 // to send numbers instead of strings with suffixes
 QString Utils::String::fromDouble(const double n, const int precision)
 {
@@ -54,21 +49,10 @@ QString Utils::String::fromDouble(const double n, const int precision)
     return QLocale::system().toString(std::floor(n * prec) / prec, 'f', precision);
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 QString Utils::String::wildcardToRegexPattern(const QString &pattern)
 {
     return QRegularExpression::wildcardToRegularExpression(pattern, QRegularExpression::UnanchoredWildcardConversion);
 }
-#else
-// This is marked as internal in QRegExp.cpp, but is exported. The alternative would be to
-// copy the code from QRegExp::wc2rx().
-QString qt_regexp_toCanonical(const QString &pattern, QRegExp::PatternSyntax patternSyntax);
-
-QString Utils::String::wildcardToRegexPattern(const QString &pattern)
-{
-    return qt_regexp_toCanonical(pattern, QRegExp::Wildcard);
-}
-#endif
 
 QStringList Utils::String::splitCommand(const QString &command)
 {
diff --git a/src/gui/CMakeLists.txt b/src/gui/CMakeLists.txt
index 78ed703da..8bff5528a 100644
--- a/src/gui/CMakeLists.txt
+++ b/src/gui/CMakeLists.txt
@@ -1,11 +1,4 @@
-if (QT6)
-    find_package(Qt6 ${minQt6Version} REQUIRED COMPONENTS Widgets Svg)
-else()
-    find_package(Qt5 ${minQt5Version} REQUIRED COMPONENTS Widgets Svg)
-    if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
-        find_package(Qt5 ${minQt5Version} REQUIRED COMPONENTS WinExtras)
-    endif()
-endif()
+find_package(Qt6 ${minQt6Version} REQUIRED COMPONENTS Widgets Svg)
 
 # CMAKE_AUTO_UI causes unnecessary rebuilds
 qt_wrap_ui(UI_HEADERS
@@ -276,9 +269,6 @@ endif()
 
 if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
     target_link_libraries(qbt_gui PRIVATE PowrProf)
-    if (NOT QT6)
-        target_link_libraries(qbt_gui PRIVATE Qt5::WinExtras)
-    endif()
 endif()
 
 if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
diff --git a/src/gui/addnewtorrentdialog.cpp b/src/gui/addnewtorrentdialog.cpp
index cf0ee4aaa..98667c31c 100644
--- a/src/gui/addnewtorrentdialog.cpp
+++ b/src/gui/addnewtorrentdialog.cpp
@@ -153,16 +153,7 @@ public:
                                   : BitTorrent::TorrentContentLayout::Subfolder);
 
         if (!m_filePriorities.isEmpty())
-        {
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-            const int currentSize = m_filePriorities.size();
-            m_filePriorities.resize(filesCount());
-            for (int i = currentSize; i < filesCount(); ++i)
-                m_filePriorities[i] = BitTorrent::DownloadPriority::Normal;
-#else
             m_filePriorities.resize(filesCount(), BitTorrent::DownloadPriority::Normal);
-#endif
-        }
     }
 
     bool hasMetadata() const override
@@ -289,13 +280,8 @@ AddNewTorrentDialog::AddNewTorrentDialog(const BitTorrent::AddTorrentParams &inP
     , m_storeDialogSize(SETTINGS_KEY(u"DialogSize"_s))
     , m_storeDefaultCategory(SETTINGS_KEY(u"DefaultCategory"_s))
     , m_storeRememberLastSavePath(SETTINGS_KEY(u"RememberLastSavePath"_s))
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     , m_storeTreeHeaderState(u"GUI/Qt6/" SETTINGS_KEY(u"TreeHeaderState"_s))
     , m_storeSplitterState(u"GUI/Qt6/" SETTINGS_KEY(u"SplitterState"_s))
-#else
-    , m_storeTreeHeaderState(SETTINGS_KEY(u"TreeHeaderState"_s))
-    , m_storeSplitterState(SETTINGS_KEY(u"SplitterState"_s))
-#endif
 {
     // TODO: set dialog file properties using m_torrentParams.filePriorities
     m_ui->setupUi(this);
diff --git a/src/gui/cookiesdialog.cpp b/src/gui/cookiesdialog.cpp
index db9a91b8d..52d0dc860 100644
--- a/src/gui/cookiesdialog.cpp
+++ b/src/gui/cookiesdialog.cpp
@@ -44,11 +44,7 @@ CookiesDialog::CookiesDialog(QWidget *parent)
     , m_ui(new Ui::CookiesDialog)
     , m_cookiesModel(new CookiesModel(Net::DownloadManager::instance()->allCookies(), this))
     , m_storeDialogSize(SETTINGS_KEY(u"Size"_s))
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     , m_storeViewState("GUI/Qt6/" SETTINGS_KEY(u"ViewState"_s))
-#else
-    , m_storeViewState(SETTINGS_KEY(u"CookiesViewState"_s))
-#endif
 {
     m_ui->setupUi(this);
 
diff --git a/src/gui/fspathedit.cpp b/src/gui/fspathedit.cpp
index d620793a8..ff3a8f1e4 100644
--- a/src/gui/fspathedit.cpp
+++ b/src/gui/fspathedit.cpp
@@ -98,7 +98,7 @@ FileSystemPathEdit::FileSystemPathEditPrivate::FileSystemPathEditPrivate(
     , m_validator {new Private::FileSystemPathValidator(q)}
 {
     m_browseAction->setIconText(browseButtonBriefText.tr());
-    m_browseAction->setShortcut(Qt::CTRL + Qt::Key_B);
+    m_browseAction->setShortcut(Qt::CTRL | Qt::Key_B);
     m_browseAction->setToolTip(browseButtonFullText.tr().remove(u'&'));
 
     m_browseBtn->setDefaultAction(m_browseAction);
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index 8a10f7025..f3548d731 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -39,6 +39,7 @@
 #include <versionhelpers.h>  // must follow after Windows.h
 #endif
 
+#include <QAction>
 #include <QActionGroup>
 #include <QClipboard>
 #include <QCloseEvent>
@@ -49,6 +50,7 @@
 #include <QFileSystemWatcher>
 #include <QKeyEvent>
 #include <QLabel>
+#include <QMenu>
 #include <QMessageBox>
 #include <QMetaObject>
 #include <QMimeData>
@@ -870,7 +872,7 @@ void MainWindow::createKeyboardShortcuts()
     m_ui->actionIncreaseQueuePos->setShortcut(Qt::CTRL | Qt::Key_Plus);
     m_ui->actionTopQueuePos->setShortcut(Qt::CTRL | Qt::SHIFT | Qt::Key_Plus);
 #ifdef Q_OS_MACOS
-    m_ui->actionMinimize->setShortcut(Qt::CTRL + Qt::Key_M);
+    m_ui->actionMinimize->setShortcut(Qt::CTRL | Qt::Key_M);
     addAction(m_ui->actionMinimize);
 #endif
 }
diff --git a/src/gui/previewselectdialog.cpp b/src/gui/previewselectdialog.cpp
index 21546e081..ca0e2320e 100644
--- a/src/gui/previewselectdialog.cpp
+++ b/src/gui/previewselectdialog.cpp
@@ -52,11 +52,7 @@ PreviewSelectDialog::PreviewSelectDialog(QWidget *parent, const BitTorrent::Torr
     , m_ui(new Ui::PreviewSelectDialog)
     , m_torrent(torrent)
     , m_storeDialogSize(SETTINGS_KEY(u"Size"_s))
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     , m_storeTreeHeaderState(u"GUI/Qt6/" SETTINGS_KEY(u"HeaderState"_s))
-#else
-    , m_storeTreeHeaderState(SETTINGS_KEY(u"HeaderState"_s))
-#endif
 {
     m_ui->setupUi(this);
 
diff --git a/src/gui/properties/peerlistwidget.cpp b/src/gui/properties/peerlistwidget.cpp
index bc8fc5077..afae06d64 100644
--- a/src/gui/properties/peerlistwidget.cpp
+++ b/src/gui/properties/peerlistwidget.cpp
@@ -74,17 +74,10 @@ bool operator==(const PeerEndpoint &left, const PeerEndpoint &right)
     return (left.address == right.address) && (left.connectionType == right.connectionType);
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 std::size_t qHash(const PeerEndpoint &peerEndpoint, const std::size_t seed = 0)
 {
     return qHashMulti(seed, peerEndpoint.address, peerEndpoint.connectionType);
 }
-#else
-uint qHash(const PeerEndpoint &peerEndpoint, const uint seed = 0)
-{
-    return (qHash(peerEndpoint.address, seed) ^ ::qHash(peerEndpoint.connectionType));
-}
-#endif
 
 namespace
 {
diff --git a/src/gui/properties/piecesbar.cpp b/src/gui/properties/piecesbar.cpp
index eccbe6814..0d42ec2ab 100644
--- a/src/gui/properties/piecesbar.cpp
+++ b/src/gui/properties/piecesbar.cpp
@@ -144,11 +144,7 @@ bool PiecesBar::event(QEvent *e)
     return base::event(e);
 }
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 void PiecesBar::enterEvent(QEnterEvent *e)
-#else
-void PiecesBar::enterEvent(QEvent *e)
-#endif
 {
     m_hovered = true;
     base::enterEvent(e);
diff --git a/src/gui/properties/piecesbar.h b/src/gui/properties/piecesbar.h
index 1e87ba364..2f6e20615 100644
--- a/src/gui/properties/piecesbar.h
+++ b/src/gui/properties/piecesbar.h
@@ -59,11 +59,7 @@ public:
 
 protected:
     // QWidget interface
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     void enterEvent(QEnterEvent *e) override;
-#else
-    void enterEvent(QEvent *e) override;
-#endif
     void leaveEvent(QEvent *e) override;
     void mouseMoveEvent(QMouseEvent *e) override;
 
diff --git a/src/gui/properties/proptabbar.cpp b/src/gui/properties/proptabbar.cpp
index aa43dd109..c7b1a4302 100644
--- a/src/gui/properties/proptabbar.cpp
+++ b/src/gui/properties/proptabbar.cpp
@@ -48,7 +48,7 @@ PropTabBar::PropTabBar(QWidget *parent)
             UIThemeManager::instance()->getIcon(u"help-about"_s, u"document-properties"_s),
 #endif
             tr("General"), parent);
-    mainInfosButton->setShortcut(Qt::ALT + Qt::Key_G);
+    mainInfosButton->setShortcut(Qt::ALT | Qt::Key_G);
     addWidget(mainInfosButton);
     m_btnGroup->addButton(mainInfosButton, MainTab);
     // Trackers tab
@@ -57,7 +57,7 @@ PropTabBar::PropTabBar(QWidget *parent)
             UIThemeManager::instance()->getIcon(u"trackers"_s, u"network-server"_s),
 #endif
             tr("Trackers"), parent);
-    trackersButton->setShortcut(Qt::ALT + Qt::Key_C);
+    trackersButton->setShortcut(Qt::ALT | Qt::Key_C);
     addWidget(trackersButton);
     m_btnGroup->addButton(trackersButton, TrackersTab);
     // Peers tab
@@ -66,7 +66,7 @@ PropTabBar::PropTabBar(QWidget *parent)
             UIThemeManager::instance()->getIcon(u"peers"_s),
 #endif
             tr("Peers"), parent);
-    peersButton->setShortcut(Qt::ALT + Qt::Key_R);
+    peersButton->setShortcut(Qt::ALT | Qt::Key_R);
     addWidget(peersButton);
     m_btnGroup->addButton(peersButton, PeersTab);
     // URL seeds tab
@@ -75,7 +75,7 @@ PropTabBar::PropTabBar(QWidget *parent)
             UIThemeManager::instance()->getIcon(u"network-server"_s),
 #endif
             tr("HTTP Sources"), parent);
-    URLSeedsButton->setShortcut(Qt::ALT + Qt::Key_B);
+    URLSeedsButton->setShortcut(Qt::ALT | Qt::Key_B);
     addWidget(URLSeedsButton);
     m_btnGroup->addButton(URLSeedsButton, URLSeedsTab);
     // Files tab
@@ -84,7 +84,7 @@ PropTabBar::PropTabBar(QWidget *parent)
             UIThemeManager::instance()->getIcon(u"directory"_s),
 #endif
             tr("Content"), parent);
-    filesButton->setShortcut(Qt::ALT + Qt::Key_Z);
+    filesButton->setShortcut(Qt::ALT | Qt::Key_Z);
     addWidget(filesButton);
     m_btnGroup->addButton(filesButton, FilesTab);
     // Spacer
@@ -95,7 +95,7 @@ PropTabBar::PropTabBar(QWidget *parent)
             UIThemeManager::instance()->getIcon(u"chart-line"_s),
 #endif
             tr("Speed"), parent);
-    speedButton->setShortcut(Qt::ALT + Qt::Key_D);
+    speedButton->setShortcut(Qt::ALT | Qt::Key_D);
     addWidget(speedButton);
     m_btnGroup->addButton(speedButton, SpeedTab);
     // SIGNAL/SLOT
diff --git a/src/gui/rss/automatedrssdownloader.cpp b/src/gui/rss/automatedrssdownloader.cpp
index 7bb5e4eb7..233e28f6a 100644
--- a/src/gui/rss/automatedrssdownloader.cpp
+++ b/src/gui/rss/automatedrssdownloader.cpp
@@ -67,13 +67,8 @@ AutomatedRssDownloader::AutomatedRssDownloader(QWidget *parent)
     , m_ui {new Ui::AutomatedRssDownloader}
     , m_addTorrentParamsWidget {new AddTorrentParamsWidget}
     , m_storeDialogSize {u"RssFeedDownloader/geometrySize"_s}
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     , m_storeMainSplitterState {u"GUI/Qt6/RSSFeedDownloader/HSplitterSizes"_s}
     , m_storeRuleDefSplitterState {u"GUI/Qt6/RSSFeedDownloader/RuleDefSplitterState"_s}
-#else
-    , m_storeMainSplitterState {u"RssFeedDownloader/qt5/hsplitterSizes"_s}
-    , m_storeRuleDefSplitterState {u"RssFeedDownloader/qt5/RuleDefSplitterState"_s}
-#endif
 {
     m_ui->setupUi(this);
 
diff --git a/src/gui/rss/feedlistwidget.cpp b/src/gui/rss/feedlistwidget.cpp
index ebd77889d..d1a0e3fd8 100644
--- a/src/gui/rss/feedlistwidget.cpp
+++ b/src/gui/rss/feedlistwidget.cpp
@@ -242,7 +242,7 @@ void FeedListWidget::dragMoveEvent(QDragMoveEvent *event)
 {
     QTreeWidget::dragMoveEvent(event);
 
-    QTreeWidgetItem *item = itemAt(event->pos());
+    QTreeWidgetItem *item = itemAt(event->position().toPoint());
     if ((item == m_unreadStickyItem)  // Prohibit dropping onto global unread counter
         || selectedItems().contains(m_unreadStickyItem)  // Prohibit dragging of global unread counter
         || (item && isFeed(item)))  // Prohibit dropping onto feeds
@@ -253,7 +253,7 @@ void FeedListWidget::dragMoveEvent(QDragMoveEvent *event)
 
 void FeedListWidget::dropEvent(QDropEvent *event)
 {
-    QTreeWidgetItem *destFolderItem = itemAt(event->pos());
+    QTreeWidgetItem *destFolderItem = itemAt(event->position().toPoint());
     RSS::Folder *destFolder = (destFolderItem
                                ? static_cast<RSS::Folder *>(getRSSItem(destFolderItem))
                                : RSS::Session::instance()->rootFolder());
diff --git a/src/gui/torrentcontentmodel.cpp b/src/gui/torrentcontentmodel.cpp
index 204caf5bf..43460a487 100644
--- a/src/gui/torrentcontentmodel.cpp
+++ b/src/gui/torrentcontentmodel.cpp
@@ -40,9 +40,6 @@
 #if defined(Q_OS_WIN)
 #include <Windows.h>
 #include <Shellapi.h>
-#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
-#include <QtWin>
-#endif
 #else
 #include <QMimeDatabase>
 #include <QMimeType>
@@ -133,11 +130,7 @@ namespace
             if (FAILED(hr))
                 return {};
 
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
             const auto iconPixmap = QPixmap::fromImage(QImage::fromHICON(sfi.hIcon));
-#else
-            const QPixmap iconPixmap = QtWin::fromHICON(sfi.hIcon);
-#endif
             ::DestroyIcon(sfi.hIcon);
             return iconPixmap;
         }
diff --git a/src/gui/transferlistwidget.cpp b/src/gui/transferlistwidget.cpp
index c46b65a03..d44c83f8f 100644
--- a/src/gui/transferlistwidget.cpp
+++ b/src/gui/transferlistwidget.cpp
@@ -217,15 +217,15 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *mainWindow)
     connect(editHotkey, &QShortcut::activated, this, &TransferListWidget::renameSelectedTorrent);
     const auto *deleteHotkey = new QShortcut(QKeySequence::Delete, this, nullptr, nullptr, Qt::WidgetShortcut);
     connect(deleteHotkey, &QShortcut::activated, this, &TransferListWidget::softDeleteSelectedTorrents);
-    const auto *permDeleteHotkey = new QShortcut(Qt::SHIFT + Qt::Key_Delete, this, nullptr, nullptr, Qt::WidgetShortcut);
+    const auto *permDeleteHotkey = new QShortcut((Qt::SHIFT | Qt::Key_Delete), this, nullptr, nullptr, Qt::WidgetShortcut);
     connect(permDeleteHotkey, &QShortcut::activated, this, &TransferListWidget::permDeleteSelectedTorrents);
     const auto *doubleClickHotkeyReturn = new QShortcut(Qt::Key_Return, this, nullptr, nullptr, Qt::WidgetShortcut);
     connect(doubleClickHotkeyReturn, &QShortcut::activated, this, &TransferListWidget::torrentDoubleClicked);
     const auto *doubleClickHotkeyEnter = new QShortcut(Qt::Key_Enter, this, nullptr, nullptr, Qt::WidgetShortcut);
     connect(doubleClickHotkeyEnter, &QShortcut::activated, this, &TransferListWidget::torrentDoubleClicked);
-    const auto *recheckHotkey = new QShortcut(Qt::CTRL + Qt::Key_R, this, nullptr, nullptr, Qt::WidgetShortcut);
+    const auto *recheckHotkey = new QShortcut((Qt::CTRL | Qt::Key_R), this, nullptr, nullptr, Qt::WidgetShortcut);
     connect(recheckHotkey, &QShortcut::activated, this, &TransferListWidget::recheckSelectedTorrents);
-    const auto *forceStartHotkey = new QShortcut(Qt::CTRL + Qt::Key_M, this, nullptr, nullptr, Qt::WidgetShortcut);
+    const auto *forceStartHotkey = new QShortcut((Qt::CTRL | Qt::Key_M), this, nullptr, nullptr, Qt::WidgetShortcut);
     connect(forceStartHotkey, &QShortcut::activated, this, &TransferListWidget::forceStartSelectedTorrents);
 }
 
diff --git a/src/webui/api/synccontroller.cpp b/src/webui/api/synccontroller.cpp
index 830614b28..ef906b9f0 100644
--- a/src/webui/api/synccontroller.cpp
+++ b/src/webui/api/synccontroller.cpp
@@ -186,7 +186,7 @@ namespace
             const QVariant &value = i.value();
             QVariantList removedItems;
 
-            switch (static_cast<QMetaType::Type>(value.type()))
+            switch (value.userType())
             {
             case QMetaType::QVariantMap:
                 {
@@ -232,7 +232,7 @@ namespace
             default:
                 Q_ASSERT_X(false, "processMap"
                            , u"Unexpected type: %1"_s
-                           .arg(QString::fromLatin1(QMetaType::typeName(static_cast<QMetaType::Type>(value.type()))))
+                           .arg(QString::fromLatin1(value.metaType().name()))
                            .toUtf8().constData());
             }
         }
@@ -257,9 +257,9 @@ namespace
         {
             for (auto i = data.cbegin(); i != data.cend(); ++i)
             {
-                switch (i.value().type())
+                switch (i.value().userType())
                 {
-                case QVariant::Map:
+                case QMetaType::QVariantMap:
                     if (!prevData.contains(i.key()))
                     {
                         // new list item found - append it to syncData
@@ -278,7 +278,7 @@ namespace
                         }
                     }
                     break;
-                case QVariant::StringList:
+                case QMetaType::QStringList:
                     if (!prevData.contains(i.key()))
                     {
                         // new list item found - append it to syncData
diff --git a/src/webui/api/torrentscontroller.cpp b/src/webui/api/torrentscontroller.cpp
index 57799f9e4..798619e92 100644
--- a/src/webui/api/torrentscontroller.cpp
+++ b/src/webui/api/torrentscontroller.cpp
@@ -302,9 +302,9 @@ void TorrentsController::infoAction()
 
         const auto lessThan = [](const QVariant &left, const QVariant &right) -> bool
         {
-            Q_ASSERT(left.type() == right.type());
+            Q_ASSERT(left.userType() == right.userType());
 
-            switch (static_cast<QMetaType::Type>(left.type()))
+            switch (left.userType())
             {
             case QMetaType::Bool:
                 return left.value<bool>() < right.value<bool>();
@@ -319,8 +319,8 @@ void TorrentsController::infoAction()
             case QMetaType::QString:
                 return left.value<QString>() < right.value<QString>();
             default:
-                qWarning("Unhandled QVariant comparison, type: %d, name: %s", left.type()
-                    , QMetaType::typeName(left.type()));
+                qWarning("Unhandled QVariant comparison, type: %d, name: %s"
+                        , left.userType(), left.metaType().name());
                 break;
             }
             return false;
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 611e7f96b..dbd47af58 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,8 +1,4 @@
-if (QT6)
-    find_package(Qt6 REQUIRED COMPONENTS Test)
-else()
-    find_package(Qt5 REQUIRED COMPONENTS Test)
-endif()
+find_package(Qt6 REQUIRED COMPONENTS Test)
 
 enable_testing(true)
 add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure)