diff --git a/requirements.txt b/requirements.txt
index 0692a94..0965993 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ pycorenlp==0.3.0
 PyJWT==1.7.1
 python-dateutil==2.8.0
 pytz==2019.2
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 requests-file==1.4.3
 s3transfer==0.2.1