diff --git a/requirements.txt b/requirements.txt
index 3cbb9fb2d..7a167558d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ py-flags>=1.1.4
 pyTooling>=4.0.1, <5.0
 pyAttributes>=2.5.1
 pyVHDLModel==0.24.0
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability