diff --git a/CHANGELOG.md b/CHANGELOG.md
index 009fc0f..afa687f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@
 All notable changes to `seqtree`. Dates are release dates. From 1.0.0 the project follows semantic
 versioning: breaking changes need a **major** bump.
 
-## Unreleased
+## [1.3.1] — 2026-10-19
 
 ### Changed