diff --git a/CHANGELOG.md b/CHANGELOG.md
index 519b502..0be1526 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [v3.5.1] - 2020-03-16
 ### Fixed
 - Support insta-checking for legacy puzzles
 
diff --git a/VERSION b/VERSION
index 1545d96..d5c0c99 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.5.0
+3.5.1