diff --git a/src/mcp/shared/version.py b/src/mcp/shared/version.py
index d00077705..23c46d04b 100644
--- a/src/mcp/shared/version.py
+++ b/src/mcp/shared/version.py
@@ -1,3 +1,3 @@
 from mcp.types import LATEST_PROTOCOL_VERSION
 
-SUPPORTED_PROTOCOL_VERSIONS: list[str] = ["2024-11-05", LATEST_PROTOCOL_VERSION]
+SUPPORTED_PROTOCOL_VERSIONS: list[str] = ["2024-11-05", "2025-03-26", LATEST_PROTOCOL_VERSION]
diff --git a/src/mcp/types.py b/src/mcp/types.py
index ef5e5dad8..4a9c2bf1a 100644
--- a/src/mcp/types.py
+++ b/src/mcp/types.py
@@ -23,7 +23,7 @@
   not separate types in the schema.
 """
 
-LATEST_PROTOCOL_VERSION = "2025-03-26"
+LATEST_PROTOCOL_VERSION = "2025-06-18"
 
 """
 The default negotiated version of the Model Context Protocol when no version is specified.