diff --git a/setup.cfg b/setup.cfg
index 28c222b0..d21c76a9 100755
--- a/setup.cfg
+++ b/setup.cfg
@@ -61,7 +61,7 @@ install_requires =
     pytest>=4.0
     pyyaml
     psycopg2-binary
-    celery[redis]>5
+    celery[redis]>5,<6
     apscheduler
     python-dateutil
     ocs_ingester>=3.0.4,<4.0.0