diff --git a/.mcp.json b/.mcp.json
index 045baea18..9860a4dbe 100644
--- a/.mcp.json
+++ b/.mcp.json
@@ -2,7 +2,7 @@
   "mcpServers": {
     "chrome-devtools": {
       "command": "npx",
-      "args": ["-y", "chrome-devtools-mcp@latest"]
+      "args": ["-y", "chrome-devtools-mcp@1.10.1"]
     }
   }
 }
diff --git a/scripts/codex/merge-mcp-config.js b/scripts/codex/merge-mcp-config.js
index 721e3c29f..64f42d333 100644
--- a/scripts/codex/merge-mcp-config.js
+++ b/scripts/codex/merge-mcp-config.js
@@ -94,7 +94,7 @@ const DEFAULT_MCP_STARTUP_TIMEOUT_TOML = `startup_timeout_sec = ${DEFAULT_MCP_ST
 // mcp-configs/mcp-servers.json. Existing user-managed entries are never
 // touched by the merge (add-only), except the known-invalid repair below.
 const ECC_SERVERS = {
-  'chrome-devtools': dlxServer('chrome-devtools', 'chrome-devtools-mcp@latest', { startup_timeout_sec: DEFAULT_MCP_STARTUP_TIMEOUT_SEC }, DEFAULT_MCP_STARTUP_TIMEOUT_TOML)
+  'chrome-devtools': dlxServer('chrome-devtools', 'chrome-devtools-mcp@1.10.1', { startup_timeout_sec: DEFAULT_MCP_STARTUP_TIMEOUT_SEC }, DEFAULT_MCP_STARTUP_TIMEOUT_TOML)
 };
 
 // ECC <= 2.0.0 emitted [mcp_servers.exa] with a `url` key. Codex rejects
diff --git a/tests/scripts/codex-hooks.test.js b/tests/scripts/codex-hooks.test.js
index c47f6d986..ef4934e6b 100644
--- a/tests/scripts/codex-hooks.test.js
+++ b/tests/scripts/codex-hooks.test.js
@@ -916,7 +916,7 @@ if (
       const merged = fs.readFileSync(configPath, 'utf8');
       const parsed = TOML.parse(merged);
       assert.strictEqual(parsed.mcp_servers['chrome-devtools'].command, 'npx');
-      assert.deepStrictEqual(parsed.mcp_servers['chrome-devtools'].args, ['chrome-devtools-mcp@latest']);
+      assert.deepStrictEqual(parsed.mcp_servers['chrome-devtools'].args, ['chrome-devtools-mcp@1.10.1']);
       assert.strictEqual(parsed.mcp_servers['chrome-devtools'].startup_timeout_sec, 30);
       // No retired server may be (re-)emitted — exa's url form broke Codex (#2224).
       assert.strictEqual(parsed.mcp_servers.exa, undefined);