diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 0561978..1eaee6d
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,5 @@ matplotlib
 optuna
 shap
 sklearn
-xgboost
\ No newline at end of file
+xgboost
+fonttools>=4.61.0 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file