diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39a42a2..9c047fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+## 0.4.0
+
+## What's Changed
+* feat: Add support for `426: Upgrade Required` by @willlockwood in https://github.com/Betterment/sturdy_http/pull/12
+
+## New Contributors
+* @willlockwood made their first contribution in https://github.com/Betterment/sturdy_http/pull/12
+
+**Full Changelog**: https://github.com/Betterment/sturdy_http/compare/v0.3.1...v0.4.0
+
 ## 0.3.1
 
 ## What's Changed
diff --git a/pubspec.yaml b/pubspec.yaml
index c6eee93..2ce21af 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: sturdy_http
 description: A strongly typed, event-based, reliable HTTP client that wraps `Dio`.
-version: 0.3.1
+version: 0.4.0
 homepage: https://github.com/Betterment/sturdy_http
 repository: https://github.com/Betterment/sturdy_http