diff --git a/requirements.txt b/requirements.txt
index fb9ca10..0640b0a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ plac==0.9.6
 preshed==3.0.2
 python-dateutil==2.8.0
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 s3transfer==0.2.1
 scipy==1.3.1