diff --git a/requirements.txt b/requirements.txt
index 0303d44..9c79820 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ pyyaml>=5.4.0
 attrs>=19.3.0
 fastjsonschema>=2.15.0,<2.20.0
 rfc3339-validator>=0.1.4,<1.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability