diff --git a/dev-requirements.txt b/dev-requirements.txt
index 3d10397..a968629 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -11,3 +11,4 @@ pytest-cov
 pytest-mock
 syrupy
 types-six
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability