diff --git a/requirements_dev.txt b/requirements_dev.txt
index e17c7b0..1144beb 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==5.1
 pytest==3.3.1
 boto3==1.9.81
 mock==2.0.0