diff --git a/requirements.txt b/requirements.txt
index 8cf77c90..2e500f1f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ fonttools[repacker,unicode,ufo,lxml]==4.53.1; platform_python_implementation ==
 fonttools[repacker,unicode,ufo]==4.53.1; platform_python_implementation != 'CPython'
 glyphsLib==6.7.1
 ufo2ft==3.2.5
-fontMath==0.9.3
+fontMath==0.9.4
 booleanOperations==0.9.0
 ufoLib2==0.16.0
 cffsubr==0.3.0