diff --git a/requirements.txt b/requirements.txt
index e9d926a..f32e42f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ cryptography
 passlib
 pycparser
 pyopenssl
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability