diff --git a/tools/requirements.txt b/tools/requirements.txt
index c48971c5..1af23846 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -27,7 +27,7 @@ pyparsing==2.4.6
 pytest-cov==2.8.1
 pytest==4.6.11
 scandir==1.10.0 ; python_version < '3.5'
-six==1.13.0
+six==1.15.0
 typing==3.7.4.1 ; python_version < '3.5'
 yapf==0.28
 zipp==0.6.0