diff --git a/requirements.txt b/requirements.txt
index 0c71e3a..cf5af37 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -81,7 +81,7 @@ pyshp==2.1.0
 python-dateutil==2.8.1
 python-ligo-lw==1.5.3
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 reproject==0.5.1
 requests==2.22.0
 requests-oauthlib==1.3.0