diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 3a0149163..ba65feccc 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -101,10 +101,10 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000ba50a60f8b56c7fe0");
+        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000002ebcfe2dd9eff82666");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x29c8c00e1a5f446a6364a29633d3f1ee16428d87c8d3851a1c570be8170b04c2"); //1259849
+        consensus.defaultAssumeValid = uint256S("0x59c9b9d3fec105bdc716d84caa7579503d5b05b73618d0bf2d5fa639f780a011"); //1353397
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -165,9 +165,9 @@ public:
         };
 
         chainTxData = ChainTxData{
-            // Data as of block db42d00d824950a125f9b08b6b6c282c484781562fa8b3bd29d6ce4a2627c348 (height 1259851).
-            1502955334, // * UNIX timestamp of last known number of transactions
-            11428845,  // * total number of transactions between genesis and that timestamp
+            // Data as of block 59c9b9d3fec105bdc716d84caa7579503d5b05b73618d0bf2d5fa639f780a011 (height 1353397).
+            1516406833, // * UNIX timestamp of last known number of transactions
+            19831879,  // * total number of transactions between genesis and that timestamp
                     //   (the tx=... number in the SetBestChain debug.log lines)
             0.06     // * estimated number of transactions per second after that timestamp
         };
@@ -208,10 +208,10 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000000364b0cbc3568");
+        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000007d006a402163e");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0xad8ff6c2f5580d2b50bd881e11312425ea84fa99f322bf132beb722f97971bba"); //153490
+        consensus.defaultAssumeValid = uint256S("0xa0afbded94d4be233e191525dc2d467af5c7eab3143c852c3cd549831022aad6"); //343833
 
         pchMessageStart[0] = 0xfd;
         pchMessageStart[1] = 0xd2;
@@ -252,9 +252,9 @@ public:
         };
 
         chainTxData = ChainTxData{
-            // Data as of block 3351b6229da00b47ad7a8d7e1323b0e2874744b5296e3d6448293463ab758624 (height 153489)
-            1502953751,
-            382986,
+            // Data as of block a0afbded94d4be233e191525dc2d467af5c7eab3143c852c3cd549831022aad6 (height 343833)
+            1516406749,
+            794057,
             0.01
         };
 
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index edf9a1a1c..6ff037330 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -22,7 +22,7 @@
 
 static const uint64_t GB_BYTES = 1000000000LL;
 /* Minimum free space (in GB) needed for data directory */
-static const uint64_t BLOCK_CHAIN_SIZE = 9;
+static const uint64_t BLOCK_CHAIN_SIZE = 14;
 /* Minimum free space (in GB) needed for data directory when pruned; Does not include prune target */
 static const uint64_t CHAIN_STATE_SIZE = 3;
 /* Total required space (in GB) depending on user choice (prune, not prune) */