diff --git a/tests/requirements.txt b/tests/requirements.txt
index 446044f..88214a4 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -2,7 +2,7 @@ flake8==3.5.0
 tox==3.4.0
 coverage==4.5.1
 cryptography==2.3.1
-PyYAML==3.13
+PyYAML==5.4
 pytest==3.8.1
 pytest-runner==4.2
 python-dateutil==2.7.3