diff --git a/pyproject.toml b/pyproject.toml
index e36f8dfa..e6900c65 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
     "rich>=12.0.0",
     "rich-click>=1.8.0",
     "requests>=2.28.0",
-    "pydantic>=2.5.1",
+    "pydantic>=2.5.1,<2.12.0",
     "mcp>=1.8.0",
     "fastmcp==2.10.2",
     "ruamel-yaml>=0.18.10",