diff --git a/requirements.txt b/requirements.txt
index f0a3444..848cd0d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ psycopg2==2.6.1
 ptyprocess==0.5.1
 pymongo==2.9.2
 pytz==2015.7
-PyYAML==3.11
+PyYAML==5.1
 -e git+https://github.com/recast-hep/recast-database.git@master#egg=recast-database
 -e git+https://github.com/cbora/recast-rest-api@fbf208181e3ab2fb90508e6b5a28e7a61d2ee52a#egg=recast_rest_api
 simplegeneric==0.8.1