diff --git a/syntax/requirements.txt b/syntax/requirements.txt
index 9c73f86..6292896 100644
--- a/syntax/requirements.txt
+++ b/syntax/requirements.txt
@@ -6,3 +6,4 @@ pytest-cov
 python-interface
 statistics
 parameterized
+werkzeug>=3.1.5 # not directly required, pinned by Snyk to avoid a vulnerability