diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 704bf0be..8514a9ba 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -56,6 +56,7 @@ dependencies = [
     "pyhive[hive_pure_sasl]>=0.7.0",
     "thrift-sasl",
     "dbutils>=3.1.2",
+    "mcp<2.0.0",
 ]
 
 [project.optional-dependencies]