diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index e6f87756..cf533f28 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.0.0"
+  ".": "4.0.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d5c1456..0e760061 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [4.0.1](https://github.com/jg-wright/timeline/compare/v4.0.0...v4.0.1) (2026-05-26)
+
+
+### Bug Fixes
+
+* ensure module annotation ([f250ae0](https://github.com/jg-wright/timeline/commit/f250ae00d1d4925c7cea219a3643a7604a623cd1))
+
 ## [4.0.0](https://github.com/johngeorgewright/timeline/compare/v3.0.1...v4.0.0) (2026-01-22)
 
 
diff --git a/package.json b/package.json
index f9ae75b4..e1b85362 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@johngw/timeline",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Parse a stream-like timeline of values",
   "type": "module",
   "sideEffects": false,