diff --git a/requirements.txt b/requirements.txt
index 15cf6334..d191dc0c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ decorator==5.1.1
 defusedxml==0.7.1
 executing==1.2.0
 fastjsonschema==2.16.3
-fonttools==4.39.3
+fonttools==4.43.0
 fqdn==1.5.1
 gprMax==3.1.4
 h5py==3.8.0