diff --git a/requirements.txt b/requirements.txt
index d7fac64..f87e9c6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 future==0.17.1
 networkx==2.3
 tqdm==4.35.0
-six==1.12.0
+six==1.13.0
 pytest==5.1.1