diff --git a/requirements.txt b/requirements.txt
index 41fc43f..2937a33 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,3 +20,4 @@ coverage
 coveralls
 beautifulsoup4
 whitenoise
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability