diff --git a/mcp_server/pyproject.toml b/mcp_server/pyproject.toml
index 01dfa29d..7b8b3fae 100644
--- a/mcp_server/pyproject.toml
+++ b/mcp_server/pyproject.toml
@@ -3,7 +3,7 @@ name = "mcp-server"
 version = "0.1.0"
 description = "Graphiti MCP Server"
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.10,<4"
 dependencies = [
     "mcp>=1.5.0",
     "openai>=1.68.2",