diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ed34ca0..eb8bf39e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.4.0](https://www.github.com/netlify/functions-js/compare/v0.3.1...v0.4.0) (2021-03-26)
+
+
+### Features
+
+* add TypeScript declarations ([#26](https://www.github.com/netlify/functions-js/issues/26)) ([6180687](https://www.github.com/netlify/functions-js/commit/618068784662782257d9d814c18cd3332e1b5fe7))
+
 ### [0.3.1](https://www.github.com/netlify/functions-js/compare/v0.3.0...v0.3.1) (2021-03-01)
 
 
diff --git a/package-lock.json b/package-lock.json
index 9a4e6151..0aef612f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@netlify/functions",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/package.json b/package.json
index 5d14697c..598e6255 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "@netlify/functions",
   "main": "./src/main.js",
   "types": "./src/main.d.ts",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "JavaScript utilities for Netlify Functions",
   "files": [
     "src/**/*.js",