diff --git a/requirements.txt b/requirements.txt
index 905f24e..2a92864 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ six
 requests>=2.24.0
 unicodecsv>=0.14.1
 simple-salesforce>=1.0.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability