diff --git a/requirements.txt b/requirements.txt
index 1809cfa..0e682b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,7 +39,7 @@ pyflakes==2.2.0
 pyparsing==2.4.7
 pytest==6.1.2
 python-dateutil==2.8.1
-PyYAML==5.3.1
+PyYAML==5.4
 scipy==1.5.4
 six==1.15.0
 toml==0.10.2