diff --git a/requirements_dev.txt b/requirements_dev.txt
index ff2492b..256692f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,6 +7,6 @@ tox==2.1.1
 coverage==4.0
 Sphinx==1.3.1
 cryptography==1.0.2
-PyYAML==3.11
+PyYAML==5.1
 ipdb
 IPython