diff --git a/requirements.txt b/requirements.txt
index cbe7397..3232a2e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ zeep==4.1.0
 xmltodict==0.12.0
 celery==5.2.3
 redis==4.3.4
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability