diff --git a/test/rules/requirements.txt b/test/rules/requirements.txt
index 0057c226a169..0732478672dc 100644
--- a/test/rules/requirements.txt
+++ b/test/rules/requirements.txt
@@ -4,3 +4,4 @@ regex
 bsdiff4
 python-Levenshtein
 tldextract
+filelock>=3.20.3 # not directly required, pinned by Snyk to avoid a vulnerability