diff --git a/requirements.txt b/requirements.txt
index 0118975..21b6d1b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ git+https://github.com/adsabs/ADSMicroserviceUtils.git@v1.1.5
 alembic==0.8.9
 psycopg2==2.8.3
 simplejson==3.10.0
+Werkzeug==0.15.3