diff --git a/core/setup.py b/core/setup.py
index e0f9c26bfb92..3eec083d29a0 100644
--- a/core/setup.py
+++ b/core/setup.py
@@ -56,7 +56,7 @@
     'google-auth >= 0.4.0, < 2.0.0dev',
     'requests >= 2.18.0, < 3.0.0dev',
     'setuptools >= 34.0.0',
-    'six',
+    'six >= 1.10.0',
 ]
 
 EXTRAS_REQUIREMENTS = {