diff --git a/.gitattributes b/.gitattributes
index 561487b9d..2e47b8a64 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -7,10 +7,7 @@
 *.sh text eol=lf
 .github/workflows/*.yml text eol=lf
 
-# Preserve the original Snow Skin asset line endings for byte-exact bundling.
-assets/inject/upstream/snow-skin/*.js text eol=lf
-assets/inject/upstream/snow-skin/*.css text eol=lf
-
-# Keep byte-exact macOS theme assets identical on every checkout platform.
-assets/inject/upstream/*/macos/*.js text eol=lf
-assets/inject/upstream/*/macos/*.css text eol=lf
+# Keep every byte-exact upstream theme asset stable on all checkout platforms.
+assets/inject/upstream/**/*.js text eol=lf
+assets/inject/upstream/**/*.css text eol=lf
+assets/inject/upstream/skin-packs/packs/*/theme.json text eol=lf