diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index 22d59ad..0cc4bbd 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "cloud-sql-postgresql",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "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 0807c04..874561d 100644
--- a/.codex-plugin/plugin.json
+++ b/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "cloud-sql-postgresql",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "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 6b7b74c..da59f99 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.3.0"
+  ".": "0.4.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d855028..9fb5efd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,29 @@
 # Changelog
 
+## [0.4.0](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/compare/0.3.0...0.4.0) (2026-04-14)
+
+
+### ⚠ BREAKING CHANGES
+
+* update repo name ([mcp-toolbox#​2968](https://redirect.github.com/googleapis/mcp-toolbox/issues/2968))
+
+### Features
+
+* **cloudsqlpg:** Run `SELECT 1` after successful connection attempt ([mcp-toolbox#​2997](https://redirect.github.com/googleapis/mcp-toolbox/issues/2997)) ([6ed9700](https://redirect.github.com/googleapis/mcp-toolbox/commit/6ed9700e15f08b31e65eb0afa605f4a8ea937e66)) ([7e70dc8](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/7e70dc8fefdb76fc24004adabbaf21d64d0c5c6e))
+* **skills:** Add Claude Code support to generated scripts ([mcp-toolbox#​2966](https://redirect.github.com/googleapis/mcp-toolbox/issues/2966)) ([a1609e1](https://redirect.github.com/googleapis/mcp-toolbox/commit/a1609e10a2eaf4ea68eae36acec3eed355b8a052)) ([d210a15](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/d210a15ca1a965da6a22ba43b62d3b657806777f))
+* **skills:** Add codex user agent ([mcp-toolbox#​2973](https://redirect.github.com/googleapis/mcp-toolbox/issues/2973)) ([070e939](https://redirect.github.com/googleapis/mcp-toolbox/commit/070e9399c02f088d43175ce6bf343378beb7f584)) ([d210a15](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/d210a15ca1a965da6a22ba43b62d3b657806777f))
+* **skills:** Tool invocation via npx ([mcp-toolbox#​2916](https://redirect.github.com/googleapis/mcp-toolbox/issues/2916)) ([377dc5b](https://redirect.github.com/googleapis/mcp-toolbox/commit/377dc5b00145a0044eef39314dd6b0ef5966fcd7)) ([d210a15](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/d210a15ca1a965da6a22ba43b62d3b657806777f))
+* add claude code plugin config ([#137](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/issues/137)) ([c3392b3](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/c3392b31686173ea6f62ec575ad58952dd06140b))
+* add codex plugin config ([#138](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/issues/138)) ([071d0ec](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/071d0ec09d631ba3665ef2b2bad6a6dde76796ba))
+* add new vectorassist skills ([#159](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/issues/159)) ([03874ac](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/03874acfa9570b854df59af4c7458b9d8fa3308e))
+* **skills:** update skill scripts for the new toolbox binary ([#144](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/issues/144)) ([71f5b11](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/71f5b1174965cbd626f1f5d88ec07bb2c4d92655))
+
+
+### Bug Fixes
+
+* **skills:** Fix skill generation template ([mcp-toolbox#​2914](https://redirect.github.com/googleapis/mcp-toolbox/issues/2914)) ([a01a15e](https://redirect.github.com/googleapis/mcp-toolbox/commit/a01a15ed1aa9a83eda8362578fed2e3a3c8dde99)) ([d210a15](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/d210a15ca1a965da6a22ba43b62d3b657806777f))
+* **skills:** Prevent empty strings overriding optional env vars in node scripts ([mcp-toolbox#​2963](https://redirect.github.com/googleapis/mcp-toolbox/issues/2963)) ([c52adeb](https://redirect.github.com/googleapis/mcp-toolbox/commit/c52adeba76fc13d0e6e415f6393def0648e478d6)) ([d210a15](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/commit/d210a15ca1a965da6a22ba43b62d3b657806777f))
+
 ## [0.3.0](https://github.com/gemini-cli-extensions/cloud-sql-postgresql/compare/0.2.4...0.3.0) (2026-03-27)
 
 
diff --git a/README.md b/README.md
index 416f089..d53668c 100644
--- a/README.md
+++ b/README.md
@@ -129,7 +129,7 @@ claude
 **3. Add the marketplace:**
 
 ```bash
-/plugin marketplace add https://github.com/gemini-cli-extensions/cloud-sql-postgresql.git#0.3.0
+/plugin marketplace add https://github.com/gemini-cli-extensions/cloud-sql-postgresql.git#0.4.0
 ```
 
 **4. Install the plugin:**
@@ -148,7 +148,7 @@ _(Tip: Run `/plugin list` inside Claude Code to verify the plugin is active, or
 **1. Clone the Repo:**
 
 ```bash
-git clone --branch 0.3.0 git@github.com:gemini-cli-extensions/cloud-sql-postgresql.git
+git clone --branch 0.4.0 git@github.com:gemini-cli-extensions/cloud-sql-postgresql.git
 ```
 
 **2. Install the plugin:**
@@ -197,7 +197,7 @@ _(Tip: Run `codex plugin list` or use the `/plugins` interactive menu to verify
 **1. Clone the Repo:**
 
 ```bash
-git clone --branch 0.3.0 https://github.com/gemini-cli-extensions/cloud-sql-postgresql.git
+git clone --branch 0.4.0 https://github.com/gemini-cli-extensions/cloud-sql-postgresql.git
 ```
 
 **2. Install the skills:**
diff --git a/gemini-extension.json b/gemini-extension.json
index 0627f84..c70080a 100644
--- a/gemini-extension.json
+++ b/gemini-extension.json
@@ -1,6 +1,6 @@
 {
   "name": "cloud-sql-postgresql",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "Create, connect, and interact with a Cloud SQL for PostgreSQL database and data.",
   "contextFileName": "CLOUD-SQL-POSTGRESQL.md",
   "settings": [