diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index e6f877563..cf533f280 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
new file mode 100644
index 000000000..a93351f44
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,18 @@
+# Changelog
+
+## [4.0.1](https://github.com/google/stellar-engine/compare/v4.0.0...v4.0.1) (2026-09-11)
+
+
+### Modules
+
+* **kms:** test custom modules changelog section ([f09d57a](https://github.com/google/stellar-engine/commit/f09d57a1e83e8c9ae4ac5c5e0c67a7f03d61bef4))
+
+
+### Blueprints
+
+* **il5/bastion-pattern:** test custom blueprints changelog section ([dd91564](https://github.com/google/stellar-engine/commit/dd915648ed52c83926fec60b99c2d35ea0e90c47))
+
+
+### Bug Fixes
+
+* **deploy.sh:** remove kms_project_id and us_keyring_name from gemini-stage-0 tfvars ([#234](https://github.com/google/stellar-engine/issues/234)) ([d843aec](https://github.com/google/stellar-engine/commit/d843aec5243d0207c048df819084b80babe307e1)), closes [#229](https://github.com/google/stellar-engine/issues/229)