diff --git a/setup.py b/setup.py
index bc2edea0c..0c44f8124 100644
--- a/setup.py
+++ b/setup.py
@@ -122,6 +122,13 @@ try:
 except ImportError:
     from distutils.core import setup
 else:
-    setup_args['install_requires'] = ['Twisted>=10.0.0', 'w3lib>=1.2', 'queuelib', 'lxml', 'pyOpenSSL', 'cssselect>0.8']
+    setup_args['install_requires'] = [
+        'Twisted>=10.0.0',
+        'w3lib>=1.2',
+        'queuelib',
+        'lxml',
+        'pyOpenSSL',
+        'cssselect>=0.9',
+    ]
 
 setup(**setup_args)