diff --git a/Python Workshop/requirements.txt b/Python Workshop/requirements.txt
index 92da79b..aaf3c14 100644
--- a/Python Workshop/requirements.txt	
+++ b/Python Workshop/requirements.txt	
@@ -5,4 +5,5 @@ ipywidgets
 jsonpath_rw
 seaborn
 neuprint-python
-flybrains
\ No newline at end of file
+flybrains
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file