diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..00f27404
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,31 @@
+# Changelog
+
+## [0.5.0](https://www.github.com/grain-lang/binaryen.ml/compare/v0.4.0...v0.5.0) (2021-01-12)
+
+
+### Features
+
+* Allow optional return_type parameter when creating blocks ([ab737bd](https://www.github.com/grain-lang/binaryen.ml/commit/ab737bd4940a4534a84d1dcff2d0a42cd49cdd38))
+
+
+### Bug Fixes
+
+* add arch & os restrictions for opam ([#41](https://www.github.com/grain-lang/binaryen.ml/issues/41)) ([421b45d](https://www.github.com/grain-lang/binaryen.ml/commit/421b45d152bf8c5e15ba55e60357ab6c2d7a25f4))
+* provide type to select instruction ([#46](https://www.github.com/grain-lang/binaryen.ml/issues/46)) ([2096a3c](https://www.github.com/grain-lang/binaryen.ml/commit/2096a3c2a219212519be3498c831d2e9d234a0ee))
+
+
+### Documentation
+
+* add section about static linking ([#37](https://www.github.com/grain-lang/binaryen.ml/issues/37)) ([f9afda1](https://www.github.com/grain-lang/binaryen.ml/commit/f9afda1bf80fbf06173cc1d6767164d4d93e12a5))
+
+
+### Miscellaneous Chores
+
+* Add --no-browser flag to opam-publish ([#43](https://www.github.com/grain-lang/binaryen.ml/issues/43)) ([f47f2bb](https://www.github.com/grain-lang/binaryen.ml/commit/f47f2bb1ed2016ab9f82e25e67dcc727958581c2))
+* Switch back to official setup-opam action ([#44](https://www.github.com/grain-lang/binaryen.ml/issues/44)) ([f4338bd](https://www.github.com/grain-lang/binaryen.ml/commit/f4338bd110bf5c116a8a99f9b868a83a3da82d11))
+
+
+### Continuous Integration
+
+* Add release workflow ([#21](https://www.github.com/grain-lang/binaryen.ml/issues/21)) ([bd9d210](https://www.github.com/grain-lang/binaryen.ml/commit/bd9d210f26e7dc42ba452ee6283696d538e5bbc1))
+* Add release-please-action to release process ([#55](https://www.github.com/grain-lang/binaryen.ml/issues/55)) ([5909560](https://www.github.com/grain-lang/binaryen.ml/commit/590956017550fb884c22c2681b924856a82c87b0))
diff --git a/binaryen.opam b/binaryen.opam
index 27d55e02..92b08bb6 100644
--- a/binaryen.opam
+++ b/binaryen.opam
@@ -1,5 +1,5 @@
 opam-version: "2.0"
-version: "0.4.0"
+version: "0.5.0"
 synopsis: "OCaml bindings for Binaryen"
 maintainer: "oscar@grain-lang.org"
 author: "Oscar Spencer"
diff --git a/package.json b/package.json
index e716227c..064325d4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@grain/binaryen.ml",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "OCaml bindings for Binaryen.",
   "author": "Oscar Spencer <oscar@grain-lang.org>",
   "license": "Apache-2.0",