diff --git a/integrations/mcp-server/README.md b/integrations/mcp-server/README.md
index b5384d5..e73f792 100644
--- a/integrations/mcp-server/README.md
+++ b/integrations/mcp-server/README.md
@@ -30,7 +30,7 @@ Safety defaults:
 
 The server speaks the MCP stdio transport: newline-delimited JSON-RPC (one
 message per line, no `Content-Length` headers) and negotiates
-`protocolVersion` during `initialize` (latest supported: `2025-06-18`).
+`protocolVersion` during `initialize` (latest supported: `2025-11-25`).
 
 The same ADB transport works with the OpenPhone SDK phone emulator:
 
diff --git a/integrations/mcp-server/src/index.mjs b/integrations/mcp-server/src/index.mjs
index ef44d6b..2c46210 100644
--- a/integrations/mcp-server/src/index.mjs
+++ b/integrations/mcp-server/src/index.mjs
@@ -9,7 +9,7 @@ import {
   textContent,
 } from "../runtime/protocol/openphone-runtime-tools.mjs";
 
-export const SUPPORTED_PROTOCOL_VERSIONS = ["2025-06-18"];
+export const SUPPORTED_PROTOCOL_VERSIONS = ["2025-11-25", "2025-06-18"];
 const LATEST_PROTOCOL_VERSION = SUPPORTED_PROTOCOL_VERSIONS[0];
 export const RUNTIME_PROTOCOL_INFO = runtimeProtocolInfo();
 const SERVER_INFO = {
diff --git a/tests/integrations/runtime-mcp-contract.mjs b/tests/integrations/runtime-mcp-contract.mjs
index 7829912..81b0e49 100644
--- a/tests/integrations/runtime-mcp-contract.mjs
+++ b/tests/integrations/runtime-mcp-contract.mjs
@@ -42,6 +42,17 @@ const fakeTransport = {
 
 {
   // A supported client protocolVersion is echoed back.
+  const response = await handleRequest({
+    jsonrpc: "2.0",
+    id: 1,
+    method: "initialize",
+    params: { protocolVersion: "2025-11-25" },
+  }, { transport: fakeTransport });
+  assert.equal(response.result.protocolVersion, "2025-11-25");
+}
+
+{
+  // Older supported client protocolVersions are still echoed back.
   const response = await handleRequest({
     jsonrpc: "2.0",
     id: 1,
@@ -206,14 +217,14 @@ const fakeTransport = {
       id: 1,
       method: "initialize",
       params: {
-        protocolVersion: "2025-06-18",
+        protocolVersion: "2025-11-25",
         capabilities: {},
         clientInfo: { name: "contract-test", version: "0.0.0" },
       },
     });
     const initialize = await nextResponse();
     assert.equal(initialize.id, 1);
-    assert.equal(initialize.result.protocolVersion, "2025-06-18");
+    assert.equal(initialize.result.protocolVersion, "2025-11-25");
     assert.equal(initialize.result.serverInfo.name, "openphone-runtime");
     assert.equal(initialize.result.serverInfo.runtimeProtocol.name, "openphone-runtime-protocol");
     assert.equal(initialize.result.serverInfo.runtimeProtocol.min_version, 1);