diff --git a/requirements.txt b/requirements.txt
index 8cac7974..3aa3b6f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ pandas==0.24.2
 Flask==1.0.3
 passlib==1.7.1
 neo4j==4.2.0
-PyYAML==5.1.1
+PyYAML==5.4
 wget==3.2
 requests==2.22.0
 biopython==1.73