diff --git a/requirements.txt b/requirements.txt
index 1e4775e..6fffb4d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,4 @@
 #
 #    pip-compile
 #
-fonttools==4.27.1         # via dehinter (setup.py)
+fonttools==4.28.1         # via dehinter (setup.py)