diff --git a/requirements_dev.txt b/requirements_dev.txt
index 2301c5d..3da55b7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.5.0
 tox==2.9.1
 coverage==4.4.2
 Sphinx==1.6.5
-PyYAML==3.12
+PyYAML==4.1
 pytest==3.3.1
 boto3==1.4.8
 mock==2.0.0