diff --git a/mrjob/requirements.txt b/mrjob/requirements.txt
index 0ad4b3c..a248379 100644
--- a/mrjob/requirements.txt
+++ b/mrjob/requirements.txt
@@ -24,7 +24,7 @@ pyasn1-modules==0.2.7
 pyspark==2.4.4
 python-dateutil==2.8.0
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 rsa==4.0
 s3transfer==0.2.1