diff --git a/dev-requirements.txt b/dev-requirements.txt
index da6580aa..06c45f2d 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -15,3 +15,4 @@ requests
 six>=1.15.0
 splinter>=0.13.0,<0.17
 xlrd==1.2.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability