diff --git a/requirements.txt b/requirements.txt
index 20f4284..dee3a9d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ pyparsing==2.4.0
 pytest==4.6.3
 pytest-mock==1.10.4
 python-dateutil==2.8.0
-PyYAML==5.1.1
+PyYAML==5.4
 requests==2.22.0
 requests-oauthlib==1.2.0
 rsa==4.0