diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3c51098..5aad83a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -18,3 +18,4 @@ toml==0.10.2
 tomli==1.2.2
 tzdata==2021.5
 tzlocal==4.1
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability