diff --git a/nb/class_transformation_model/requirements.txt b/nb/class_transformation_model/requirements.txt
index b3dfd03..602fe6b 100644
--- a/nb/class_transformation_model/requirements.txt
+++ b/nb/class_transformation_model/requirements.txt
@@ -6,4 +6,5 @@ ipywidgets==8.0.4
 scikit-learn==1.1.1
 scikit-uplift==0.5.1
 typing-extensions==4.4.0
-xgboost==1.7.2
\ No newline at end of file
+xgboost==1.7.2
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file