diff --git a/requirements.txt b/requirements.txt
index b8e7cdd4aa5..223ebfcdb07 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -85,7 +85,7 @@ executing==2.2.1
     # via stack-data
 fastjsonschema==2.22.2
     # via nbformat
-fonttools==4.65.0
+fonttools==4.66.0
     # via matplotlib
 fsspec==2026.9.0
     # via dask