diff --git a/requirements-dev.txt b/requirements-dev.txt
index 536dfa4..e5bdda9 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,2 +1,3 @@
 black==19.10b0
 eth-brownie>=1.12.1,<2.0.0
+vyper>=0.3.8 # not directly required, pinned by Snyk to avoid a vulnerability