diff --git a/requirements.txt b/requirements.txt
index caf4e60..12fd9b6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 matplotlib==3.1.0
 numpy==1.16.4
-PyYAML==5.1.1
+PyYAML==5.4
 scipy==1.5.2
 Pillow==6.1.0
 six==1.12.0