diff --git a/config/upgrade.sh b/config/upgrade.sh
index 894fc07..67a5008 100755
--- a/config/upgrade.sh
+++ b/config/upgrade.sh
@@ -119,6 +119,8 @@ then
        /opt/zope213/bin/pip install requests
 fi
 
+/opt/zope213/bin/pip install --upgrade python-dateutil
+
 # Ensure www-data can duplicate databases (for dumps)
 su -c $'psql -c \'alter role "www-data" with CREATEDB;\'' "$POSTGRES_SUPERUSER"
 #'