diff --git a/node/ChainwebNode.hs b/node/ChainwebNode.hs
index 1304a1f224..5fe732b8de 100644
--- a/node/ChainwebNode.hs
+++ b/node/ChainwebNode.hs
@@ -529,7 +529,7 @@ pkgInfoScopes =
 -- SERVICE DATE for version 2.19
 --
 serviceDate :: Maybe String
-serviceDate = Just "2023-09-07T00:00:00Z"
+serviceDate = Just "2023-11-07T00:00:00Z"
 
 mainInfo :: ProgramInfo ChainwebNodeConfiguration
 mainInfo = programInfoValidate
@@ -558,7 +558,7 @@ main = do
                     logFunctionJson logger Error (ProcessDied $ show e) >> throwIO e
                 ] $ do
                 kt <- mapM iso8601ParseM serviceDate
-                withServiceDate (logFunctionText logger) kt $ void $ 
+                withServiceDate (logFunctionText logger) kt $ void $
                     race (node conf logger) (gcRunner (logFunctionText logger))
     where
     gcRunner lf = runForever lf "GarbageCollect" $ do
diff --git a/src/Chainweb/Version/Mainnet.hs b/src/Chainweb/Version/Mainnet.hs
index 8240fad9e0..05ebafaf8e 100644
--- a/src/Chainweb/Version/Mainnet.hs
+++ b/src/Chainweb/Version/Mainnet.hs
@@ -139,7 +139,7 @@ mainnet = ChainwebVersion
         Chainweb217Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 3_250_348) -- 2022-12-02T00:00:00+00:00
         Chainweb218Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 3_512_363) -- 2023-03-03 00:00:00+00:00
         Chainweb219Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 3_774_423) -- 2023-06-02 00:00:00+00:00
-        Chainweb220Pact -> AllChains ForkNever
+        Chainweb220Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 4_056_980) -- 2023-09-08 00:00:00+00:00
 
     , _versionGraphs =
         (to20ChainsMainnet, twentyChainGraph) `Above`
diff --git a/src/Chainweb/Version/Testnet.hs b/src/Chainweb/Version/Testnet.hs
index dab02a2531..11a31d8859 100644
--- a/src/Chainweb/Version/Testnet.hs
+++ b/src/Chainweb/Version/Testnet.hs
@@ -119,7 +119,7 @@ testnet = ChainwebVersion
         Chainweb217Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 2_777_367  -- 2022-12-01 12:00:00+00:00
         Chainweb218Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 3_038_343  -- 2023-03-02 12:00:00+00:00
         Chainweb219Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 3_299_753 -- 2023-06-01 12:00:00+00:00
-        Chainweb220Pact -> AllChains ForkNever
+        Chainweb220Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 3_581_450 -- 2023-09-08 12:00:00+00:00
 
     , _versionGraphs =
         (to20ChainsTestnet, twentyChainGraph) `Above`
diff --git a/tools/calculate-release/CalculateRelease.hs b/tools/calculate-release/CalculateRelease.hs
index 31728264b6..06c0074306 100644
--- a/tools/calculate-release/CalculateRelease.hs
+++ b/tools/calculate-release/CalculateRelease.hs
@@ -48,8 +48,8 @@ main = do
 
     putStrLn $ "Mainnet fork height (at " <> show mainnetForkTime <> "): " <> show mainnetForkHeight
     putStrLn $ "Testnet fork height (at " <> show testnetForkTime <> "): " <> show testnetForkHeight
-    let nextServiceDateDay = addGregorianMonthsClip 4 serviceDateDay
-    putStrLn $ "Next service date (+4 months): " <> show nextServiceDateDay
+    let nextServiceDateDay = addGregorianMonthsClip 2 serviceDateDay
+    putStrLn $ "Next service date (+2 months): " <> show nextServiceDateDay
     where
     heightOfChain0 :: String -> IO BlockHeight
     heightOfChain0 cutUrl =