diff --git a/requirements_dev.txt b/requirements_dev.txt
index d6ad529..4b7c34c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,6 +5,6 @@ flake8==3.4.1
 tox==2.9.1
 coverage==4.4.1
 Sphinx==1.6.3
-PyYAML==3.12
+PyYAML==6.0.2
 pytest==3.2.3
 pytest-runner==2.12.1