diff --git a/requirements.txt b/requirements.txt
index 168687d..192e00f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ matplotlib==2.0.2
 mendeleev==0.3.4
 dropbox==8.0.0
 bokeh==0.12.9
-PyYAML==3.12
+PyYAML==5.4