diff --git a/CHANGELOG.md b/CHANGELOG.md
index 973f2a2..8e7ad0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 This project adheres to semantic versioning.
 
+## 0.4.1 (2023-10-04)
+
+Fixes pattern matching branches which return `undefined` in `matchX` and `matchXW`.
+
 ## 0.4.0 (2023-05-16)
 
 Adds supports for convenient "strict" pattern matching without access to member values, denoted by an "X" suffix.
diff --git a/package.json b/package.json
index a9b0431..2961a14 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@unsplash/sum-types",
   "description": "Safe, ergonomic, non-generic sum types in TypeScript.",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "license": "MIT",
   "author": "Unsplash",
   "repository": {
@@ -49,4 +49,4 @@
     "ts-jest": "^26.4.1",
     "typescript": "^4.0.3"
   }
-}
+}
\ No newline at end of file