diff --git a/CHANGELOG.md b/CHANGELOG.md
index a07535cc73..70f9a709cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,25 @@
 # `chainweb-node` Changelog
 
+## 2.21 (2023-10-05)
+
+This version replaces all previous versions. Any prior version will stop working
+on **2023-10-19T00:00:00Z**. Node administrators must upgrade to this version before
+that date.
+
+This version will expire on **2023-12-13T:00:00Z**.
+
+To upgrade, pull the latest docker image or download the binary and restart the node.
+
+Changes:
+
+* Support for WebAuthN signatures in Pact keyset guards. (#1729, see [https://github.com/kadena-io/pact](Pact) #1139)
+* Updated to Pact 4.9. (numerous, see [Pact
+  changelog](https://github.com/kadena-io/pact/releases/tag/v4.9))
+
+Internal Changes:
+* Updated from tls package version 1.7.1 to 1.9. (#1734)
+* Updated from base64-bytestring package version 1.0.0.3 to 1.2.1.0. (#1729)
+
 ## 2.20 (2023-08-28)
 
 This version replaces all previous versions. Any prior version will stop working
diff --git a/node/ChainwebNode.hs b/node/ChainwebNode.hs
index de7c207d00..f2cf011a92 100644
--- a/node/ChainwebNode.hs
+++ b/node/ChainwebNode.hs
@@ -526,10 +526,10 @@ pkgInfoScopes =
 -- -------------------------------------------------------------------------- --
 -- main
 
--- SERVICE DATE for version 2.19
+-- SERVICE DATE for version 2.21
 --
 serviceDate :: Maybe String
-serviceDate = Just "2023-10-19T00:00:00Z"
+serviceDate = Just "2023-12-13T00:00:00Z"
 
 mainInfo :: ProgramInfo ChainwebNodeConfiguration
 mainInfo = programInfoValidate
diff --git a/src/Chainweb/Version/Mainnet.hs b/src/Chainweb/Version/Mainnet.hs
index 657c0bfedd..75494fb991 100644
--- a/src/Chainweb/Version/Mainnet.hs
+++ b/src/Chainweb/Version/Mainnet.hs
@@ -140,8 +140,7 @@ mainnet = ChainwebVersion
         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 (ForkAtBlockHeight $ BlockHeight 4_056_499) -- 2023-09-08 00:00:00+00:00
-        -- TODO: This is a placeholder!
-        Chainweb221Pact -> AllChains ForkNever -- TODO: Fix this at release time.
+        Chainweb221Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 4_177_889) -- 2023-10-20 00:00:00+00:00
 
     , _versionGraphs =
         (to20ChainsMainnet, twentyChainGraph) `Above`
diff --git a/src/Chainweb/Version/Testnet.hs b/src/Chainweb/Version/Testnet.hs
index b4fbadf873..c6e198c052 100644
--- a/src/Chainweb/Version/Testnet.hs
+++ b/src/Chainweb/Version/Testnet.hs
@@ -120,7 +120,7 @@ testnet = ChainwebVersion
         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 $ ForkAtBlockHeight $ BlockHeight 3_580_964 -- 2023-09-08 12:00:00+00:00
-        Chainweb221Pact -> AllChains ForkNever -- TODO: Fix this at release time.
+        Chainweb221Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 3_702_250 -- 2023-10-19 12:00:00+00:00
 
     , _versionGraphs =
         (to20ChainsTestnet, twentyChainGraph) `Above`