diff --git a/clarkproc/requirements.txt b/clarkproc/requirements.txt
index a928edb..dfe4e9d 100644
--- a/clarkproc/requirements.txt
+++ b/clarkproc/requirements.txt
@@ -17,7 +17,7 @@ pandas==0.25.3
 pyrsistent==0.15.6
 python-dateutil==2.8.1
 pytz==2019.3
-PyYAML==5.2
+PyYAML==5.4
 scikit-learn==0.24.2
 scipy==1.6.3
 six==1.13.0