diff --git a/pyproject.toml b/pyproject.toml
index f741384..c36a8dd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ dependencies = [
     "requests",
     "tqdm",
     "pandas",
-    "pymongo",
+    "pymongo==3.13",
     "openpyxl",
     "biopython"
 ]