diff --git a/requirements.txt b/requirements.txt
index 99d6b72..bac86df 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,4 @@ Flask-SQLAlchemy
 Flask-Script
 Flask-Migrate
 geoip2
+mako>=1.2.2 # not directly required, pinned by Snyk to avoid a vulnerability