diff --git a/requirements_dev.txt b/requirements_dev.txt
index 515784e..4043b2c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,4 +8,4 @@ tox==2.9.1
 flake8==3.4.1
 coverage==4.4.1
 cryptography==2.1.1
-PyYAML==3.12
+PyYAML==5.1.2