diff --git a/etc/requirements_dev.txt b/etc/requirements_dev.txt
index f972634a..482fa612 100644
--- a/etc/requirements_dev.txt
+++ b/etc/requirements_dev.txt
@@ -19,7 +19,7 @@ pyflakes==0.8.1
 pyandoc==0.0.1
 docopt==0.6.2
 numpydoc==0.5
-mistune==0.5.1
+mistune==0.6
 
 # Example scripts that are run during unit tests use the following: