diff --git a/setup.py b/setup.py
index 77ef8a07..d75a70e6 100755
--- a/setup.py
+++ b/setup.py
@@ -102,7 +102,8 @@ if __name__ == "__main__":
         install_requires=[
             "deprecated",
             "pyjwt",
-            "requests>=2.14.0"
+            "requests>=2.14.0",
+            "six"
         ],
         extras_require={
             "integrations": ["cryptography"]