diff --git a/requirements.txt b/requirements.txt
index 5e54322..acdd2a1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@ matplotlib==3.0.3
 pandas==0.24.2
 colorcet==2.0.1
 numpy==1.16.3
-PyYAML==5.1.1
+PyYAML==5.4