diff --git a/requirements_dev.txt b/requirements_dev.txt
index d3d575c..bb1a953 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ tox==3.0.0
 Sphinx==1.7.5
 coverage==4.5.1
 cryptography==2.2.2
-PyYAML==3.12
+PyYAML==5.4
 pytest==3.6.0
 six==1.11.0
 enum34==1.1.6