diff --git a/CHANGELOG.md b/CHANGELOG.md
index abb8d64..2bdc5a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.31.0] - 2026-08-07
+
 ### Added
 
 - `markgo --health-check` probes the running server's `/health` endpoint and exits 0