diff --git a/requirements.txt b/requirements.txt
index 1320223..481e311 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,3 +29,5 @@ unittest2==1.1.0
 Werkzeug==1.0.1
 wheel==0.36.2
 WTForms==2.2.1
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability