diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index fdcb427..bd7fb18 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -12,7 +12,7 @@
       "name": "deploygate",
       "source": "./plugin",
       "description": "Upload apps, manage distribution pages, add team members, and set up CI/CD integration with DeployGate",
-      "version": "1.5.0"
+      "version": "1.3.1"
     }
   ]
 }
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index dd8fde7..9049e2f 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.5.0"
+  ".": "1.3.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87b31be..0dc5c7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,24 @@
 # Changelog
 
+## [1.3.1](https://github.com/DeployGate/deploygate-agent-plugin/compare/deploygate--v1.5.0...deploygate--v1.3.1) (2026-06-01)
+
+
+### Features
+
+* add release automation ([#12](https://github.com/DeployGate/deploygate-agent-plugin/issues/12)) ([492b93d](https://github.com/DeployGate/deploygate-agent-plugin/commit/492b93d5c54835c6f66426f4d27afe19b88033e8))
+* expose the full DeployGate public API as MCP tools (apps, projects, workspaces) ([#27](https://github.com/DeployGate/deploygate-agent-plugin/issues/27)) ([60b288d](https://github.com/DeployGate/deploygate-agent-plugin/commit/60b288d2f5dbff47cf9deb6035e087bfeccd3391))
+* send User-Agent header on DeployGate API requests ([#17](https://github.com/DeployGate/deploygate-agent-plugin/issues/17)) ([0756a9f](https://github.com/DeployGate/deploygate-agent-plugin/commit/0756a9fd0079c87be184737022f877e7bd6e3982))
+
+
+### Bug Fixes
+
+* **ci:** avoid fromJSON in step env so the bundle-commit step skips cleanly ([#19](https://github.com/DeployGate/deploygate-agent-plugin/issues/19)) ([de3df07](https://github.com/DeployGate/deploygate-agent-plugin/commit/de3df0736c3d67647bb85c474de172d97223ca0b))
+
+
+### Miscellaneous Chores
+
+* release 1.3.1 ([84ef070](https://github.com/DeployGate/deploygate-agent-plugin/commit/84ef070e562f5a8982794154e6c17bc49cc9e6c5))
+
 ## [1.5.0](https://github.com/DeployGate/deploygate-agent-plugin/compare/deploygate--v1.4.0...deploygate--v1.5.0) (2026-06-01)
 
 
diff --git a/package-lock.json b/package-lock.json
index 7aaf94b..7363534 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@deploygate/mcp",
-  "version": "1.5.0",
+  "version": "1.3.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@deploygate/mcp",
-      "version": "1.5.0",
+      "version": "1.3.1",
       "license": "MIT",
       "bin": {
         "deploygate-mcp": "plugin/scripts/bundle.js"
diff --git a/package.json b/package.json
index 64a9cf0..7bb9a1e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@deploygate/mcp",
-  "version": "1.5.0",
+  "version": "1.3.1",
   "description": "DeployGate MCP server: upload mobile apps, manage distribution pages, set up CI/CD, and onboard your team. Supports iOS (IPA) and Android (APK/AAB).",
   "type": "module",
   "bin": {
diff --git a/plugin/.claude-plugin/plugin.json b/plugin/.claude-plugin/plugin.json
index e85be63..438530e 100644
--- a/plugin/.claude-plugin/plugin.json
+++ b/plugin/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "deploygate",
-  "version": "1.5.0",
+  "version": "1.3.1",
   "description": "DeployGate agent integration: upload mobile apps, manage distribution pages, set up CI/CD, and onboard your team. Supports iOS (IPA) and Android (APK/AAB).",
   "author": {
     "name": "DeployGate",
diff --git a/plugin/.codex-plugin/plugin.json b/plugin/.codex-plugin/plugin.json
index fa3aa83..ff69c17 100644
--- a/plugin/.codex-plugin/plugin.json
+++ b/plugin/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "deploygate",
-  "version": "1.5.0",
+  "version": "1.3.1",
   "description": "DeployGate agent integration: upload mobile apps, manage distribution pages, set up CI/CD, and onboard your team. Supports iOS (IPA) and Android (APK/AAB).",
   "author": {
     "name": "DeployGate",
diff --git a/plugin/scripts/bundle.js b/plugin/scripts/bundle.js
index 728594b..745fcae 100755
--- a/plugin/scripts/bundle.js
+++ b/plugin/scripts/bundle.js
@@ -30954,7 +30954,7 @@ import { homedir } from "node:os";
 import { basename, join } from "node:path";
 
 // dist/version.js
-var VERSION = true ? "1.5.0" : "dev";
+var VERSION = true ? "1.3.1" : "dev";
 
 // dist/client.js
 var BASE_URL = "https://deploygate.com";