diff --git a/CHANGELOG.md b/CHANGELOG.md
index b76cf21..7d3acc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## [0.12.0] - 2026-05-11
+
 ### Changed
 
 - `multipartkit/form.add_field`, `add_file`, `add_field_strict`, and
diff --git a/gleam.toml b/gleam.toml
index a22755a..a4cbe8e 100644
--- a/gleam.toml
+++ b/gleam.toml
@@ -1,5 +1,5 @@
 name = "multipartkit"
-version = "0.11.0"
+version = "0.12.0"
 description = "Multipart body parsing and generation primitives for Gleam on Erlang and JavaScript targets"
 licences = ["MIT"]
 repository = { type = "github", user = "nao1215", repo = "multipartkit" }