diff --git a/server/website/requirements.txt b/server/website/requirements.txt
index c90fc46..b4e01fa 100644
--- a/server/website/requirements.txt
+++ b/server/website/requirements.txt
@@ -1,7 +1,7 @@
 autopep8==1.4.4
-celery==3.1.23
+celery>=3.1.23,<4.0.0
 Django==1.11.27
-django-celery==3.2.1
+django-celery<=3.3.1
 django-debug-toolbar==1.5
 django-db-logger>=0.1.7
 django-request-logging==0.4.6