diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4dda48a..a0668b8 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,2 +1,3 @@
 black==19.10b0
 eth-brownie>=1.11.7,<2.0.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability