diff --git a/requirements.txt b/requirements.txt
index f8ac8db..94d317f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ pytest==4.0.1
 python-dateutil==2.7.5
 PyYAML==3.13
 redis==3.0.1
-six==1.11.0
+six==1.12.0
 tmx==1.10
 pytest-mock==1.10.0
 Pillow==5.3.0