diff --git a/quartz/cli/constants.js b/quartz/cli/constants.js
index 21f340d59..f4a9ce52b 100644
--- a/quartz/cli/constants.js
+++ b/quartz/cli/constants.js
@@ -6,7 +6,7 @@ import { readFileSync } from "fs"
  */
 export const ORIGIN_NAME = "origin"
 export const UPSTREAM_NAME = "upstream"
-export const QUARTZ_SOURCE_BRANCH = "main"
+export const QUARTZ_SOURCE_BRANCH = "v4"
 export const cwd = process.cwd()
 export const cacheDir = path.join(cwd, ".quartz-cache")
 export const cacheFile = "./quartz/.quartz-cache/transpiled-build.mjs"