diff --git a/requirements.txt b/requirements.txt
index b01030b37..c5646c635 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ ufoLib2==0.16.0
 ufo2ft==3.2.5
 pyobjc==10.3.1; sys_platform == "darwin"
 freetype-py==2.4.0
-uharfbuzz==0.39.1
+uharfbuzz==0.39.3
 glyphsLib==6.7.1 # this is only required to run Tests/varLib/interpolatable_test.py
 lxml==5.2.2
 sympy==1.12.1