diff --git a/build/venv-test-ipywidgets8-requirements.txt b/build/venv-test-ipywidgets8-requirements.txt
index 08f9e8928..6d40b2342 100644
--- a/build/venv-test-ipywidgets8-requirements.txt
+++ b/build/venv-test-ipywidgets8-requirements.txt
@@ -16,7 +16,7 @@ zipp>=4.1.0
 tornado>=6.5.9
 anyio>=4.4.0
 requests>=2.34.2
-fonttools>=4.65.0
+fonttools>=4.66.0
 jupyter-server>=2.21.0
 jupyter-core>=5.9.1
 ipython>=9.17.1