diff --git a/pkgs/development/python-modules/mcp/default.nix b/pkgs/development/python-modules/mcp/default.nix
index 4862c9cc7d95..0cd8d583e6b2 100644
--- a/pkgs/development/python-modules/mcp/default.nix
+++ b/pkgs/development/python-modules/mcp/default.nix
@@ -75,6 +75,8 @@ buildPythonPackage rec {
     "test_command_execution"
   ];
 
+  __darwinAllowLocalNetworking = true;
+
   meta = {
     changelog = "https://github.com/modelcontextprotocol/python-sdk/releases/tag/${src.tag}";
     description = "Official Python SDK for Model Context Protocol servers and clients";