diff --git a/requirements.txt b/requirements.txt
index 66fa5f6..f6fdbc0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,5 @@
 #
 #    pip-compile requirements.in
 #
-fonttools==4.27.1
+fonttools==4.39.4
     # via -r requirements.in