diff --git a/CMakeLists.txt b/CMakeLists.txt
index f390c33f4..aa9fdefcf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@ project(qBittorrent
 set(CMAKE_FIND_PACKAGE_PREFER_CONFIG ON)
 # version requirements - older vesions may work, but you are on your own
 set(minBoostVersion 1.65)
-set(minQtVersion 5.14)
+set(minQtVersion 5.15.2)
 set(minOpenSSLVersion 1.1.1)
 set(minLibtorrentVersion 1.2.14)
 set(minZlibVersion 1.2.11)
diff --git a/INSTALL b/INSTALL
index 6c6b7a3c1..79639b390 100644
--- a/INSTALL
+++ b/INSTALL
@@ -11,7 +11,7 @@ qBittorrent - A BitTorrent client in C++ / Qt
 
   - OpenSSL >= 1.1.1
 
-  - Qt >= 5.14
+  - Qt >= 5.15.2
 
   - zlib >= 1.2.11
 
diff --git a/configure b/configure
index 2d4980fcd..91fa2a986 100755
--- a/configure
+++ b/configure
@@ -1450,7 +1450,7 @@ Some influential environment variables:
               directories to add to pkg-config's search path
   PKG_CONFIG_LIBDIR
               path overriding pkg-config's built-in search path
-  QT_QMAKE    value of host_bins for Qt5Core >= 5.14, overriding pkg-config
+  QT_QMAKE    value of host_bins for Qt5Core >= 5.15.2, overriding pkg-config
   Qt5Svg_CFLAGS
               C compiler flags for Qt5Svg, overriding pkg-config
   Qt5Svg_LIBS linker flags for Qt5Svg, overriding pkg-config
@@ -5456,8 +5456,8 @@ printf "%s\n" "$enable_webui" >&6; }
 esac
 
 if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
@@ -5466,12 +5466,12 @@ if test -n "$QT_QMAKE"; then
     pkg_cv_QT_QMAKE="$QT_QMAKE"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_QT_QMAKE=`$PKG_CONFIG --variable="host_bins" "Qt5Core >= 5.14" 2>/dev/null`
+  pkg_cv_QT_QMAKE=`$PKG_CONFIG --variable="host_bins" "Qt5Core >= 5.15.2" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5501,8 +5501,8 @@ fi
 
 fi
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5 qmake >= 5.14" >&5
-printf %s "checking for Qt5 qmake >= 5.14... " >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5 qmake >= 5.15.2" >&5
+printf %s "checking for Qt5 qmake >= 5.15.2... " >&6; }
 if test "x$QT_QMAKE" != "x"
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $QT_QMAKE" >&5
@@ -5529,12 +5529,12 @@ if test -n "$Qt5Svg_CFLAGS"; then
     pkg_cv_Qt5Svg_CFLAGS="$Qt5Svg_CFLAGS"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_Qt5Svg_CFLAGS=`$PKG_CONFIG --cflags "Qt5Svg >= 5.14" 2>/dev/null`
+  pkg_cv_Qt5Svg_CFLAGS=`$PKG_CONFIG --cflags "Qt5Svg >= 5.15.2" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5546,12 +5546,12 @@ if test -n "$Qt5Svg_LIBS"; then
     pkg_cv_Qt5Svg_LIBS="$Qt5Svg_LIBS"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_Qt5Svg_LIBS=`$PKG_CONFIG --libs "Qt5Svg >= 5.14" 2>/dev/null`
+  pkg_cv_Qt5Svg_LIBS=`$PKG_CONFIG --libs "Qt5Svg >= 5.15.2" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5572,14 +5572,14 @@ else
         _pkg_short_errors_supported=no
 fi
         if test $_pkg_short_errors_supported = yes; then
-	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "Qt5Svg >= 5.14" 2>&1`
+	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "Qt5Svg >= 5.15.2" 2>&1`
         else
-	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "Qt5Svg >= 5.14" 2>&1`
+	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "Qt5Svg >= 5.15.2" 2>&1`
         fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$Qt5Svg_PKG_ERRORS" >&5
 
-	as_fn_error $? "Package requirements (Qt5Svg >= 5.14) were not met:
+	as_fn_error $? "Package requirements (Qt5Svg >= 5.15.2) were not met:
 
 $Qt5Svg_PKG_ERRORS
 
@@ -5619,11 +5619,11 @@ case "x$enable_qt_dbus" in #(
   "xyes") :
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 printf "%s\n" "yes" >&6; }
-               { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5DBus >= 5.14" >&5
-printf %s "checking for Qt5DBus >= 5.14... " >&6; }
+               { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5DBus >= 5.15.2" >&5
+printf %s "checking for Qt5DBus >= 5.15.2... " >&6; }
        if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5DBus >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5DBus >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5DBus >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5DBus >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
diff --git a/configure.ac b/configure.ac
index 8f2064243..5c63b1df0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,3 +1,4 @@
+
 AC_INIT([qbittorrent], [v4.4.0alpha], [bugs.qbittorrent.org], [], [https://www.qbittorrent.org/])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
@@ -141,7 +142,7 @@ AS_IF([test "x$QT_QMAKE" = "x"],
       [AC_MSG_ERROR([Could not find qmake])
       ])
 AS_IF([test "x$enable_gui" = "xyes"],
-      [PKG_CHECK_MODULES(Qt5Svg, [Qt5Svg >= 5.14])
+      [PKG_CHECK_MODULES(Qt5Svg, [Qt5Svg >= 5.15.2])
       ])
 AC_MSG_CHECKING([whether QtDBus should be enabled])
 AS_CASE(["x$enable_qt_dbus"],
diff --git a/m4/qbittorrent.m4 b/m4/qbittorrent.m4
index 56bdadaaa..e67f93544 100644
--- a/m4/qbittorrent.m4
+++ b/m4/qbittorrent.m4
@@ -5,9 +5,9 @@
 # Sets the QT_QMAKE variable to the path of Qt5 qmake if found.
 # --------------------------------------
 AC_DEFUN([FIND_QT5],
-[PKG_CHECK_EXISTS([Qt5Core >= 5.14],
+[PKG_CHECK_EXISTS([Qt5Core >= 5.15.2],
                  [PKG_CHECK_VAR(QT_QMAKE,
-                                [Qt5Core >= 5.14],
+                                [Qt5Core >= 5.15.2],
                                 [host_bins])
                  ])
 
@@ -18,7 +18,7 @@ AS_IF([test -f "$QT_QMAKE/qmake"],
                              [QT_QMAKE=""])
               ])
 
-AC_MSG_CHECKING([for Qt5 qmake >= 5.14])
+AC_MSG_CHECKING([for Qt5 qmake >= 5.15.2])
 AS_IF([test "x$QT_QMAKE" != "x"],
       [AC_MSG_RESULT([$QT_QMAKE])],
       [AC_MSG_RESULT([not found])]
@@ -29,8 +29,8 @@ AS_IF([test "x$QT_QMAKE" != "x"],
 # Sets the HAVE_QTDBUS variable to true or false.
 # --------------------------------------
 AC_DEFUN([FIND_QTDBUS],
-       [AC_MSG_CHECKING([for Qt5DBus >= 5.14])
-       PKG_CHECK_EXISTS([Qt5DBus >= 5.14],
+       [AC_MSG_CHECKING([for Qt5DBus >= 5.15.2])
+       PKG_CHECK_EXISTS([Qt5DBus >= 5.15.2],
                         [AC_MSG_RESULT([found])
                          HAVE_QTDBUS=[true]],
                         [AC_MSG_RESULT([not found])
diff --git a/src/app/application.cpp b/src/app/application.cpp
index d89a51719..1bd586755 100644
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@@ -435,16 +435,12 @@ void Application::runExternalProgram(const BitTorrent::Torrent *torrent) const
     // enable command injection via torrent name and other arguments
     // (especially when some automated download mechanism has been setup).
     // See: https://github.com/qbittorrent/qBittorrent/issues/10925
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     QStringList args = QProcess::splitCommand(program);
     if (args.isEmpty())
         return;
 
     const QString command = args.takeFirst();
     QProcess::startDetached(command, args);
-#else
-    QProcess::startDetached(program);
-#endif
 #endif
 }
 
diff --git a/src/base/net/smtp.cpp b/src/base/net/smtp.cpp
index df5f157f0..0c4ed4e69 100644
--- a/src/base/net/smtp.cpp
+++ b/src/base/net/smtp.cpp
@@ -122,12 +122,7 @@ Smtp::Smtp(QObject *parent)
 
     connect(m_socket, &QIODevice::readyRead, this, &Smtp::readyRead);
     connect(m_socket, &QAbstractSocket::disconnected, this, &QObject::deleteLater);
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     connect(m_socket, &QAbstractSocket::errorOccurred, this, &Smtp::error);
-#else
-    connect(m_socket, qOverload<QAbstractSocket::SocketError>(&QAbstractSocket::error)
-            , this, &Smtp::error);
-#endif
 
     // Test hmacMD5 function (http://www.faqs.org/rfcs/rfc2202.html)
     Q_ASSERT(hmacMD5("Jefe", "what do ya want for nothing?").toHex()
diff --git a/src/gui/properties/proptabbar.cpp b/src/gui/properties/proptabbar.cpp
index 1f6b53e42..de7079c96 100644
--- a/src/gui/properties/proptabbar.cpp
+++ b/src/gui/properties/proptabbar.cpp
@@ -100,13 +100,8 @@ PropTabBar::PropTabBar(QWidget *parent)
     addWidget(speedButton);
     m_btnGroup->addButton(speedButton, SpeedTab);
     // SIGNAL/SLOT
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     connect(m_btnGroup, &QButtonGroup::idClicked
             , this, &PropTabBar::setCurrentIndex);
-#else
-    connect(m_btnGroup, qOverload<int>(&QButtonGroup::buttonClicked)
-            , this, &PropTabBar::setCurrentIndex);
-#endif
     // Disable buttons focus
     for (QAbstractButton *btn : asConst(m_btnGroup->buttons()))
         btn->setFocusPolicy(Qt::NoFocus);
diff --git a/src/gui/torrentoptionsdialog.cpp b/src/gui/torrentoptionsdialog.cpp
index 71326f71c..49ac52cf7 100644
--- a/src/gui/torrentoptionsdialog.cpp
+++ b/src/gui/torrentoptionsdialog.cpp
@@ -263,12 +263,7 @@ TorrentOptionsDialog::TorrentOptionsDialog(QWidget *parent, const QVector<BitTor
     connect(m_ui->checkMaxRatio, &QCheckBox::toggled, m_ui->spinRatioLimit, &QDoubleSpinBox::setEnabled);
     connect(m_ui->checkMaxTime, &QCheckBox::toggled, m_ui->spinTimeLimit, &QSpinBox::setEnabled);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     connect(m_ui->buttonGroup, &QButtonGroup::idClicked, this, &TorrentOptionsDialog::handleRatioTypeChanged);
-#else
-    connect(m_ui->buttonGroup, qOverload<int>(&QButtonGroup::buttonClicked)
-            , this, &TorrentOptionsDialog::handleRatioTypeChanged);
-#endif
 
     Utils::Gui::resize(this, m_storeDialogSize);
 }