diff --git a/setup.py b/setup.py
index 107124a..643be54 100644
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,6 @@ setuptools.setup(
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],
-    install_requires=['cryptography>=3.4.7', 'pyserial', 'netifaces>=0.10.4'],
+    install_requires=['cryptography>=3.4.7', 'pyserial', 'netifaces>=0.10.4', 'six'],
     python_requires='>=3.6',
-)
\ No newline at end of file
+)