diff --git a/requirements.txt b/requirements.txt
index e27cd42e..8efb19bb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ httplib2>=0.12.0
 oauth2client>=4.0.0
 tornado>=6.0.1
 google-api-python-client>=1.7.8
-cloudpickle>=0.8,<=1.4.1
+cloudpickle>=0.8,<2.2.1
 urllib3==1.24.2
 boto3>=1.9.0
 azure-storage-file>=2.1.0