diff --git a/requirements.txt b/requirements.txt
index 58980ad..5ffa4d9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ requests
 numpy
 scikit-image
 matplotlib
+certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability