diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 43e8482a6..047e3e273 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -253,10 +253,10 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].nThreshold = 50; // 50% of 100
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0000000000000000000000000000000000000000000000000000004a6cde841e"); //4971
+        consensus.nMinimumChainWork = uint256S("00000000000000000000000000000000000000000000000000000003cd72a542"); //4000
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0000000114adcd3b4bc74f2cbb3b2506c195070f1c71bab786f0b1b3f25dd660"); //4971
+        consensus.defaultAssumeValid = uint256S("00000ce22113f3eb8636e225d6a1691e132fdd587aed993e1bc9b07a0235eea4"); //4000
 
         pchMessageStart[0] = 0xce;
         pchMessageStart[1] = 0xe2;