diff --git a/requirements.txt b/requirements.txt
index a8710b5c..f73d7ad2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ ply
 pytest
 pytest-runner
 requests
-six==1.14.0
+six==1.15.0
 sphinx
 twine
 wheel