diff --git a/docs/requirements.txt b/docs/requirements.txt
index cda5908..fdfd79e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -65,7 +65,7 @@ executing==2.2.0
     # via stack-data
 fastjsonschema==2.21.1
     # via nbformat
-fonttools==4.59.0
+fonttools==4.61.0
     # via matplotlib
 fqdn==1.5.1
     # via jsonschema