diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 1ff3cf6e08..409cd52463 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -310,20 +310,20 @@ public:
 
         // Deployment of BIP68, BIP112, and BIP113.
         consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
-        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1506556800; // September 28th, 2017
-        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1538092800; // September 28th, 2018
+        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1544655600; // Dec 13th, 2018
+        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1576191600; // Dec 13th, 2019
 
         // Deployment of DIP0001
         consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].bit = 1;
-        consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].nStartTime = 1505692800; // Sep 18th, 2017
-        consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].nTimeout = 1537228800; // Sep 18th, 2018
+        consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].nStartTime = 1544655600; // Dec 13th, 2018
+        consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].nTimeout = 1576191600; // Dec 13th, 2019
         consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].nWindowSize = 100;
         consensus.vDeployments[Consensus::DEPLOYMENT_DIP0001].nThreshold = 50; // 50% of 100
 
         // Deployment of BIP147
         consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].bit = 2;
-        consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].nStartTime = 1517792400; // Feb 5th, 2018
-        consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].nTimeout = 1549328400; // Feb 5th, 2019
+        consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].nStartTime = 1544655600; // Dec 13th, 2018
+        consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].nTimeout = 1576191600; // Dec 13th, 2019
         consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].nWindowSize = 100;
         consensus.vDeployments[Consensus::DEPLOYMENT_BIP147].nThreshold = 50; // 50% of 100