diff --git a/tests/rest/requirements.txt b/tests/rest/requirements.txt
index 68a4e3c..b8ff984 100644
--- a/tests/rest/requirements.txt
+++ b/tests/rest/requirements.txt
@@ -19,7 +19,7 @@ pykwalify==1.7.0
 pytest==4.5.0
 python-box==3.4.5
 python-dateutil==2.8.1
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 six==1.13.0
 stevedore==1.31.0