diff --git a/requirements.txt b/requirements.txt
index 4305102..f1815f7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -58,7 +58,7 @@ docutils==0.21.2
     #   sphinx-rtd-theme
 executing==2.2.1
     # via stack-data
-fonttools==4.61.0
+fonttools==4.63.0
     # via matplotlib
 gef-file-to-map==0.2.1
     # via pygef