diff --git a/requirements.txt b/requirements.txt
index 8ec6d75..86f49d1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,3 +10,4 @@ six==1.15.0
 sqlparse==0.5.0
 gunicorn==22.0.0
 whitenoise==3.3.1
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability