diff --git a/code/Ch4/pyproject.toml b/code/Ch4/pyproject.toml
index ac71d4e..23def72 100644
--- a/code/Ch4/pyproject.toml
+++ b/code/Ch4/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "decorator==5.2.1",
     "et-xmlfile==2.0.0",
     "executing==2.2.1",
-    "fonttools==4.60.1",
+    "fonttools==4.61.0",
     "frozenlist==1.8.0",
     "fsspec==2025.9.0",
     "gcsfs==2025.9.0",