diff --git a/requirements.txt b/requirements.txt
index 1e400fc0c..282d150e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ ufoLib2==0.16.0
 ufo2ft==3.0.0
 pyobjc==10.1; sys_platform == "darwin"
 freetype-py==2.4.0
-uharfbuzz==0.37.3
+uharfbuzz==0.39.0
 glyphsLib==6.6.0 # this is only required to run Tests/varLib/interpolatable_test.py
 lxml==5.1.0
 sympy==1.12