diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2be9c43c..af55ef03 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.2.0"
+  ".": "0.2.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e1bc10c..fabb5a08 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.2.1](https://github.com/metasequoiaime/MSIME-Windows/compare/v0.2.0...v0.2.1) (2026-09-06)
+
+
+### Bug Fixes
+
+* **server:** adopt isolated engine sessions and helpcode annotations ([#178](https://github.com/metasequoiaime/MSIME-Windows/issues/178)) ([2b8bf93](https://github.com/metasequoiaime/MSIME-Windows/commit/2b8bf937d96e5ff80e19f97de5be594802d90b5d))
+
 ## [0.2.0](https://github.com/metasequoiaime/MSIME-Windows/compare/v0.1.4...v0.2.0) (2026-09-06)
 
 
diff --git a/version.txt b/version.txt
index 0ea3a944..0c62199f 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-0.2.0
+0.2.1