diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 8f0b848e67..5eff1ae636 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -379,7 +379,7 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
 
         consensus.vDeployments[Consensus::DEPLOYMENT_V20].bit = 9;
-        consensus.vDeployments[Consensus::DEPLOYMENT_V20].nStartTime = 19999999999;     // TODO: To be determined later
+        consensus.vDeployments[Consensus::DEPLOYMENT_V20].nStartTime = 1693526400;     // Friday, September 1, 2023 0:00:00
         consensus.vDeployments[Consensus::DEPLOYMENT_V20].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
         consensus.vDeployments[Consensus::DEPLOYMENT_V20].nWindowSize = 100;
         consensus.vDeployments[Consensus::DEPLOYMENT_V20].nThresholdStart = 80;         // 80% of 100
@@ -387,7 +387,7 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_V20].nFalloffCoeff = 5;            // this corresponds to 10 periods
 
         consensus.vDeployments[Consensus::DEPLOYMENT_MN_RR].bit = 10;
-        consensus.vDeployments[Consensus::DEPLOYMENT_MN_RR].nStartTime = 19999999999;   // TODO: To be determined later
+        consensus.vDeployments[Consensus::DEPLOYMENT_MN_RR].nStartTime = 1693526400;   // Friday, September 1, 2023 0:00:00
         consensus.vDeployments[Consensus::DEPLOYMENT_MN_RR].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
         consensus.vDeployments[Consensus::DEPLOYMENT_MN_RR].nWindowSize = 100;
         consensus.vDeployments[Consensus::DEPLOYMENT_MN_RR].nThresholdStart = 80;       // 80% of 100