diff --git a/tox.ini b/tox.ini
index c549641cc..7f38f14a4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ deps =
     httpbin==0.4.1
     hypothesis==3.1.0
     itsdangerous==0.24
-    Mako==1.0.3
+    Mako==1.0.4
     parse==1.6.6
     parse-type==0.3.4
     py==1.4.31