diff --git a/requirements.txt b/requirements.txt
index c7995c3..0e53adc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,5 +12,5 @@ Pygments==2.5.1
 pymdown-extensions==6.2
 PyYAML==5.1.2
 singledispatch==3.4.0.3
-six==1.12.0
+six==1.13.0
 tornado==6.0.3