diff --git a/test-requirements.txt b/test-requirements.txt
index 24bad9d..a6794c9 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,4 +3,5 @@ pytest
 pytest-cov
 coveralls
 coverage
-PyYAML
\ No newline at end of file
+PyYAML
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file