diff --git a/requirements.dev.txt b/requirements.dev.txt
index 8786151..7e18a84 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -2,3 +2,4 @@
 flake8==3.8.3
 pre-commit>=2.7.0
 pylint==2.6.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability