diff --git a/dev-requirements.txt b/dev-requirements.txt
index c420cc45..bdac2949 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -5,7 +5,7 @@ marshmallow>=2.15.2
 invoke==1.2.0
 
 # Testing
-pytest==3.8.2
+pytest==3.9.1
 tox==3.5.2
 mock==2.0.0
 webtest==2.0.32