diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index b8f51dd4c..ece03992a 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -21,7 +21,7 @@ dependencies = [
     "jsonref>=1.1.0",
     "ruamel-yaml==0.19.1",
     "redis>=5.0.0",
-    "fastmcp>=2.14.2,<3.0",
+    "fastmcp>=2.14.2,<4.0",
     "langchain>=0.3.26",
     "scikit-learn>=1.0.0",
     "numpy>=1.24.0",