diff --git a/pyproject.toml b/pyproject.toml
index 96d3654..c62cab2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ dependencies = [
     "pydantic>=2.5.0",
     "pydantic-settings>=2.1.0",
     "nltk>=3.8.1",
-    "mcp>=1.0.0",
+    "mcp>=1.0.0,<2.0.0",
     "packaging>=24.0",
 ]