diff --git a/CHANGELOG.md b/CHANGELOG.md
index f2b32c7..02c0faa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# [4.0.0](https://github.com/reactjs/react-transition-group/compare/v3.0.0...v4.0.0) (2019-04-16)
+
+
+### Features
+
+* support esm via package.json routes ([#488](https://github.com/reactjs/react-transition-group/issues/488)) ([6337bf5](https://github.com/reactjs/react-transition-group/commit/6337bf5)), closes [#77](https://github.com/reactjs/react-transition-group/issues/77)
+
+
+### BREAKING CHANGES
+
+* in environments where esm is supported importing from commonjs requires explicitly adding the `.default` after `require()` when resolving to the esm build
+
 # [3.0.0](https://github.com/reactjs/react-transition-group/compare/v2.9.0...v3.0.0) (2019-04-15)
 
 
diff --git a/package.json b/package.json
index 5b47e0c..2143116 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-transition-group",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "A react component toolset for managing animations",
   "main": "lib/cjs/index.js",
   "module": "lib/esm/index.js",