diff --git a/requirements.txt b/requirements.txt
index f476d8fe2..67f724f4b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ ufoLib2==0.16.1
 ufo2ft==3.3.1
 pyobjc==10.3.1; sys_platform == "darwin"
 freetype-py==2.5.1
-uharfbuzz==0.41.1
-glyphsLib==6.9.3 # this is only required to run Tests/varLib/interpolatable_test.py
+uharfbuzz==0.42.0
+glyphsLib==6.9.4 # this is only required to run Tests/varLib/interpolatable_test.py
 lxml==5.3.0
 sympy==1.13.3