diff --git a/requirements.txt b/requirements.txt
index d2a7336..56e2dbe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 cycler==0.11.0; python_version >= "3.7"
-fonttools==4.28.2; python_version >= "3.7"
+fonttools==4.39.0; python_version >= "3.7"
 kiwisolver==1.3.2; python_version >= "3.7"
 matplotlib==3.5.0; python_version >= "3.7"
 numpy==1.21.4; python_version >= "3.7" and python_version < "3.11"