diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@
 
 ## [Unreleased]
 
+## 0.21.0.0 — 2026-10-14
+
+### Other Changes
+
+- No user-facing changes this release. Version and internal dependency bounds
+  advance with the shared 0.21.0.0 release.
+
 ## 0.20.0.0 — 2026-10-12
 
 ### Breaking Changes
diff --git a/keiro-core.cabal b/keiro-core.cabal
--- a/keiro-core.cabal
+++ b/keiro-core.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: keiro-core
-version: 0.20.0.0
+version: 0.21.0.0
 synopsis: Core contracts for Keiro packages
 description:
   Stable stream, codec, event-stream, and integration-event contracts