diff --git a/setup.py b/setup.py
index f05cbeb..510052a 100755
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,7 @@ setuptools.setup(
     ],
     install_requires=[
         'async_property',
+        'websockets',
     ],
     long_description=long_description,
     long_description_content_type='text/markdown',