diff --git a/tools/zircolite_server/requirements.txt b/tools/zircolite_server/requirements.txt
index 732b02f..d380287 100644
--- a/tools/zircolite_server/requirements.txt
+++ b/tools/zircolite_server/requirements.txt
@@ -1,3 +1,4 @@
 flask>=1.1.2
 jinja2>=2.11.3
 werkzeug>=3.0.3 # not directly required, pinned by Snyk to avoid a vulnerability
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability