diff --git a/requirements/test_requirements.txt b/requirements/test_requirements.txt
index f41529147..54ace209a 100644
--- a/requirements/test_requirements.txt
+++ b/requirements/test_requirements.txt
@@ -21,3 +21,4 @@ pyparsing>=2.0.2
 suds-community
 zeep
 pandas
+waitress>=3.0.1 # not directly required, pinned by Snyk to avoid a vulnerability