diff --git a/setup.py b/setup.py
old mode 100755
new mode 100644
index 4897e51..34d1869
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
     install_requires=[
         'wagtail>=1.0',
         'requests>=2.9.1',
-        'celery>=4.0,<4.1'
+        'celery>=4.0,<5.4'
     ],
     zip_safe=False,
     license='BSD License',