diff --git a/requirements.txt b/requirements.txt
index 5dedd4e..a7e1fbe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ pyparsing==2.4.2
 pyrsistent==0.15.4
 python-crfsuite==0.9.6
 python-dateutil==2.8.0
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 rsa==3.4.2
 s3transfer==0.2.1