diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index 6a99632..1a85349 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "cloud-sql-postgresql",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Create, connect, and interact with a Cloud SQL for PostgreSQL database and data.",
   "author": {
     "name": "Google LLC",
diff --git a/.codex-plugin/plugin.json b/.codex-plugin/plugin.json
index 1373e63..5800351 100644
--- a/.codex-plugin/plugin.json
+++ b/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "cloud-sql-postgresql",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Create, connect, and interact with a Cloud SQL for PostgreSQL database and data.",
   "author": {
     "name": "Google LLC",
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index da59f99..3e2bf49 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.4.0"
+  ".": "0.4.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9fb5efd..19721c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.4.1](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/compare/0.4.0...0.4.1) (2026-09-23)
+
+
+### Features
+
+* **plugin:** migrate from generated skills to the prebuilt MCP server ([#187](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/issues/187)) ([6191fb9](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/6191fb93757355204a5f909d41ad6c9fa2900a83))
+* **plugin:** support agent plugin spec ([#185](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/issues/185)) ([69cf787](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/69cf78726668b7b922758b963212fe46744511ac))
+
 ## [0.4.0](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/compare/0.3.0...0.4.0) (2026-04-14)
 
 
diff --git a/README.md b/README.md
index 38e11e7..d727227 100644
--- a/README.md
+++ b/README.md
@@ -89,8 +89,8 @@ For the latest version, check the [releases page][releases].
 <summary id="antigravity">Antigravity</summary>
 
 You can use either of these two agents for Antigravity:
-- [Antigravity CLI](https://github.com/google-gemini/gemini-cli) version **v1.6.0** or higher
-- [Antigravity 2.0](https://antigravity.google/product/antigravity-2) version **v2.0.0** or higher.
+- [Antigravity CLI](https://github.com/google-gemini/gemini-cli) version **v0.4.1** or higher
+- [Antigravity 2.0](https://antigravity.google/product/antigravity-2) version **v0.4.1** or higher.
 
 <blockquote>
 💡 <strong>Tip — Migrating from Gemini CLI?</strong><br>
diff --git a/gemini-extension.json b/gemini-extension.json
index fa81ef9..313de94 100644
--- a/gemini-extension.json
+++ b/gemini-extension.json
@@ -1,6 +1,6 @@
 {
   "name": "cloud-sql-postgresql",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Create, connect, and interact with a Cloud SQL for PostgreSQL database and data.",
   "mcpServers": {
     "cloud-sql-postgres": {
diff --git a/plugin.json b/plugin.json
index 68d2dca..f5f2eb9 100644
--- a/plugin.json
+++ b/plugin.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
   "name": "cloud-sql-postgresql",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Create, connect, and interact with a Cloud SQL for PostgreSQL database and data.",
   "author": {
     "name": "Google LLC",