diff --git a/requirements_dev.txt b/requirements_dev.txt
index 8d57d1a93..496174204 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,5 +7,5 @@ tox==3.8.6
 coverage==4.5.3
 Sphinx==2.0.1
 cryptography==2.6.1
-PyYAML==5.1
+PyYAML==5.4