diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca323ae..ed35f9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 0.4.0 (unreleased)
+## 0.4.0 (2019-05-23)
  * Fixed `shouldFail.reverting.withMessage` on non-Ganache chains. ([#25](https://github.com/OpenZeppelin/openzeppelin-test-helpers/pull/25))
  * Fixed `send.transaction` not working on contracts with a fallback function. ([#26](https://github.com/OpenZeppelin/openzeppelin-test-helpers/pull/26))
  * Made `shouldFail.reverting.withMessage` fail if no error string was provided. ([#28](https://github.com/OpenZeppelin/openzeppelin-test-helpers/pull/28))
diff --git a/package-lock.json b/package-lock.json
index a0f07d9..f31eafa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "openzeppelin-test-helpers",
-  "version": "0.3.2",
+  "version": "0.4.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index e3dacd5..e87c421 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "openzeppelin-test-helpers",
-  "version": "0.3.2",
+  "version": "0.4.0",
   "description": "JavaScript testing helpers for Ethereum smart contract development.",
   "main": "index.js",
   "files": [