diff --git a/.github/workflows/wheels-dependencies.sh b/.github/workflows/wheels-dependencies.sh
index 797f4613a..0d45d5a20 100755
--- a/.github/workflows/wheels-dependencies.sh
+++ b/.github/workflows/wheels-dependencies.sh
@@ -16,7 +16,7 @@ ARCHIVE_SDIR=pillow-depends-main
 
 # Package versions for fresh source builds
 FREETYPE_VERSION=2.13.2
-HARFBUZZ_VERSION=8.3.1
+HARFBUZZ_VERSION=8.4.0
 LIBPNG_VERSION=1.6.43
 JPEGTURBO_VERSION=3.0.2
 OPENJPEG_VERSION=2.5.2
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index 43d710055..0d6da7754 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -113,7 +113,7 @@ V = {
     "BROTLI": "1.1.0",
     "FREETYPE": "2.13.2",
     "FRIBIDI": "1.0.13",
-    "HARFBUZZ": "8.3.1",
+    "HARFBUZZ": "8.4.0",
     "JPEGTURBO": "3.0.2",
     "LCMS2": "2.16",
     "LIBPNG": "1.6.43",