diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 409cd52463..2e58610450 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -328,10 +328,10 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].nThreshold = 50; // 50% of 100
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000003be69c34b1244f"); // 143200
+        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000000000003cd72a542"); // 4000
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x0000000004a7878409189b7a8f75b3815d9b8c45ee8f79955a6c727d83bddb04"); // 143200
+        consensus.defaultAssumeValid = uint256S("0x00000ce22113f3eb8636e225d6a1691e132fdd587aed993e1bc9b07a0235eea4"); // 4000
 
         pchMessageStart[0] = 0xce;
         pchMessageStart[1] = 0xe2;