diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f49384..0bcd5bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic
 Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [12.1.0] - 2018-09-25
 
 ### Added
 - Maps and sets now have the `clear` method just like `Vector`. (#46)
diff --git a/Cargo.toml b/Cargo.toml
index cdde7a9..b34f52c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "im"
-version = "12.0.0"
+version = "12.1.0"
 authors = ["Bodil Stokke <bodil@bodil.org>"]
 license = "MPL-2.0+"
 description = "Immutable collection datatypes"