diff --git a/requirements.txt b/requirements.txt
index 6ce0aee..2234733 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-fontTools==4.0.2
\ No newline at end of file
+fontTools==4.2.4
\ No newline at end of file
diff --git a/setup.py b/setup.py
index b6dc103..faf4039 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
 AUTHOR = "Source Foundry Authors and Contributors"
 REQUIRES_PYTHON = ">=3.6.0"
 
-INSTALL_REQUIRES = ["fontTools==4.0.0",
+INSTALL_REQUIRES = ["fontTools==4.2.4",
                     ]
 # Optional packages
 EXTRAS_REQUIRES = {