diff --git a/requirements.txt b/requirements.txt
index 448ced0..36d9103 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ pycparser==2.19
 PyNaCl==1.3.0
 pytest==4.4.2
 pytest-cov==2.7.1
-six==1.12.0
+six==1.15.0
 websockets==6.0
 wincertstore==0.2
 yarl==1.3.0