diff --git a/pyproject.toml b/pyproject.toml
index fc590418e7..80dec58b99 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ classifiers = [
 dependencies = [
   "attrs>=23.1.0,<24",
   "boto3>=1.34.142,<2.0",
-  "cloudpickle>=2.2.1",
+  "cloudpickle==2.2.1",
   "docker",
   "google-pasta",
   "importlib-metadata>=1.4.0,<7.0",