diff --git a/requirements.txt b/requirements.txt
index 9d27a99..e422eff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ fontmake==3.4.0
 fontMath==0.9.2
 fontParts==0.10.6
 fontPens==0.2.4
-fonttools==4.34.4
+fonttools==4.43.0
 freetype-py==2.3.0
 fs==2.4.16
 gfdiffbrowsers==0.1.7