diff --git a/requirements_dev.txt b/requirements_dev.txt
index fa79e02..fa9c0bf 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,7 +8,7 @@ tox==2.9.1
 coverage==4.4.2
 Sphinx==1.6.5
 cryptography==1.7
-PyYAML==3.11
+PyYAML==5.4
 pytest==4.3.0
 pytest-runner==3.0
 pycodestyle==2.3.1