diff --git a/docs/protocol.md b/docs/protocol.md
index 16ba0bfa..a2724b76 100644
--- a/docs/protocol.md
+++ b/docs/protocol.md
@@ -165,7 +165,7 @@ func ExampleStreamableHTTPHandler() {
 	resp := mustPostMessage(`{"jsonrpc": "2.0", "id": 1, "method":"initialize", "params": {}}`, httpServer.URL)
 	fmt.Println(resp)
 	// Output:
-	// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.1.0"}}}
+	// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.1.0"}}}
 }
 ```
 
diff --git a/docs/troubleshooting.md b/docs/troubleshooting.md
index b8cc7769..1a0c3679 100644
--- a/docs/troubleshooting.md
+++ b/docs/troubleshooting.md
@@ -50,8 +50,8 @@ func ExampleLoggingTransport() {
 	}
 
 	// Output:
-	// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.0.1"}}}
-	// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-06-18","capabilities":{"roots":{"listChanged":true}}}}
+	// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.0.1"}}}
+	// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-11-25","capabilities":{"roots":{"listChanged":true}}}}
 	// write: {"jsonrpc":"2.0","method":"notifications/initialized","params":{}}
 }
 ```
diff --git a/mcp/shared.go b/mcp/shared.go
index d83eae7d..b559236f 100644
--- a/mcp/shared.go
+++ b/mcp/shared.go
@@ -33,8 +33,8 @@ const (
 	//
 	// It is the version that the client sends in the initialization request, and
 	// the default version used by the server.
-	latestProtocolVersion   = protocolVersion20250618
-	protocolVersion20251125 = "2025-11-25" // not yet released
+	latestProtocolVersion   = protocolVersion20251125
+	protocolVersion20251125 = "2025-11-25"
 	protocolVersion20250618 = "2025-06-18"
 	protocolVersion20250326 = "2025-03-26"
 	protocolVersion20241105 = "2024-11-05"
diff --git a/mcp/streamable_example_test.go b/mcp/streamable_example_test.go
index f1cdf90a..7ff1612e 100644
--- a/mcp/streamable_example_test.go
+++ b/mcp/streamable_example_test.go
@@ -35,7 +35,7 @@ func ExampleStreamableHTTPHandler() {
 	resp := mustPostMessage(`{"jsonrpc": "2.0", "id": 1, "method":"initialize", "params": {}}`, httpServer.URL)
 	fmt.Println(resp)
 	// Output:
-	// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.1.0"}}}
+	// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.1.0"}}}
 }
 
 // !-streamablehandler
diff --git a/mcp/streamable_test.go b/mcp/streamable_test.go
index b1c3f074..58d3956a 100644
--- a/mcp/streamable_test.go
+++ b/mcp/streamable_test.go
@@ -758,7 +758,7 @@ func TestStreamableServerTransport(t *testing.T) {
 			Logging: &LoggingCapabilities{},
 			Tools:   &ToolCapabilities{ListChanged: true},
 		},
-		ProtocolVersion: latestProtocolVersion,
+		ProtocolVersion: protocolVersion20250618,
 		ServerInfo:      &Implementation{Name: "testServer", Version: "v1.0.0"},
 	}, nil)
 	initializedMsg := req(0, notificationInitialized, &InitializedParams{})
diff --git a/mcp/testdata/conformance/server/version-latest.txtar b/mcp/testdata/conformance/server/version-latest.txtar
index 75317676..77d1de26 100644
--- a/mcp/testdata/conformance/server/version-latest.txtar
+++ b/mcp/testdata/conformance/server/version-latest.txtar
@@ -20,7 +20,7 @@ response with its latest supported version.
 		"capabilities": {
 			"logging": {}
 		},
-		"protocolVersion": "2025-06-18",
+		"protocolVersion": "2025-11-25",
 		"serverInfo": {
 			"name": "testServer",
 			"version": "v1.0.0"
diff --git a/mcp/transport_example_test.go b/mcp/transport_example_test.go
index bb032f11..62fc0315 100644
--- a/mcp/transport_example_test.go
+++ b/mcp/transport_example_test.go
@@ -45,8 +45,8 @@ func ExampleLoggingTransport() {
 	}
 
 	// Output:
-	// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.0.1"}}}
-	// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-06-18","capabilities":{"roots":{"listChanged":true}}}}
+	// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.0.1"}}}
+	// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-11-25","capabilities":{"roots":{"listChanged":true}}}}
 	// write: {"jsonrpc":"2.0","method":"notifications/initialized","params":{}}
 }