diff --git a/pyproject.toml b/pyproject.toml
index 774249210b..768298b5a6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ dependencies = [
     "pydantic-settings>=2.0.3",
     "pydantic>=2.0.1",
     "pymatgen>=2024.11.13",
-    "pymongo<=4.10.1",
+    "pymongo<=4.15.5",
 ]
 
 [project.optional-dependencies]