diff --git a/.github/workflows/ecosystem-ci-selected.yml b/.github/workflows/ecosystem-ci-selected.yml
index c11abbe5..9db101ef 100644
--- a/.github/workflows/ecosystem-ci-selected.yml
+++ b/.github/workflows/ecosystem-ci-selected.yml
@@ -41,6 +41,9 @@ on:
       vite_plugin_react_repo:
         description: "vite-plugin-react repository to use"
         type: string
+      rolldownRef:
+        description: "rolldown commit sha to use from pkg.pr.new"
+        type: string
       suite:
         description: "testsuite to run"
         required: true
@@ -101,12 +104,14 @@ jobs:
           pnpm tsx ecosystem-ci.ts
           "--$REF_TYPE" "$REF"
           --repo "$REPO"
+          ${ROLLDOWN_REF:+--rolldown-ref "$ROLLDOWN_REF"}
           "$SUITE"
         id: ecosystem-ci-run
         env:
           REF_TYPE: ${{ inputs.refType }}
           REF: ${{ inputs.ref }}
           REPO: ${{ inputs.repo }}
+          ROLLDOWN_REF: ${{ inputs.rolldownRef }}
           SUITE: ${{ inputs.suite }}
           VITE_PLUGIN_REACT_REF: ${{ inputs.vite_plugin_react_ref }}
           VITE_PLUGIN_REACT_REPO: ${{ inputs.vite_plugin_react_repo }}
diff --git a/.github/workflows/ecosystem-ci.yml b/.github/workflows/ecosystem-ci.yml
index c9aa6654..7401d26a 100644
--- a/.github/workflows/ecosystem-ci.yml
+++ b/.github/workflows/ecosystem-ci.yml
@@ -37,6 +37,9 @@ on:
         required: true
         type: string
         default: "vitejs/vite"
+      rolldownRef:
+        description: "rolldown commit sha to use from pkg.pr.new"
+        type: string
       sendDiscordReport:
         description: "send results to discord"
         type: boolean
@@ -98,12 +101,14 @@ jobs:
           pnpm tsx ecosystem-ci.ts
           "--$REF_TYPE" "$REF"
           --repo "$REPO"
+          ${ROLLDOWN_REF:+--rolldown-ref "$ROLLDOWN_REF"}
           "$SUITE"
         id: ecosystem-ci-run
         env:
           REF_TYPE: ${{ inputs.refType || github.event.client_payload.refType || 'branch' }}
           REF: ${{ inputs.ref || github.event.client_payload.ref || 'main' }}
           REPO: ${{ inputs.repo || github.event.client_payload.repo || 'vitejs/vite' }}
+          ROLLDOWN_REF: ${{ inputs.rolldownRef || github.event.client_payload.rolldownRef }}
           SUITE: ${{ matrix.suite }}
       - if: always() && (inputs.sendDiscordReport || github.event_name != 'workflow_dispatch')
         run: pnpm tsx discord-webhook.ts
diff --git a/ecosystem-ci.ts b/ecosystem-ci.ts
index 98ae3cb1..5517d10c 100644
--- a/ecosystem-ci.ts
+++ b/ecosystem-ci.ts
@@ -22,10 +22,13 @@ cli
 	.option('--tag <tag>', 'vite tag to use')
 	.option('--commit <commit>', 'vite commit sha to use')
 	.option('--release <version>', 'vite release to use from npm registry')
+	.option(
+		'--rolldown-ref <commit>',
+		'rolldown commit sha to use from pkg.pr.new',
+	)
 	.action(async (suites, options: CommandOptions) => {
 		if (options.commit) {
 			const url = `https://pkg.pr.new/vite@${options.commit}`
-			//eslint-disable-next-line n/no-unsupported-features/node-builtins
 			const { status } = await fetch(url)
 			if (status === 200) {
 				options.release = url
@@ -34,12 +37,25 @@ cli
 				console.log(`continuous release available on ${url}`)
 			}
 		}
+		let rolldownRelease: string | undefined
+		if (options.rolldownRef) {
+			const url = `https://pkg.pr.new/rolldown@${options.rolldownRef}`
+			const { status } = await fetch(url)
+			if (status === 200) {
+				rolldownRelease = url
+				console.log(`rolldown continuous release available on ${url}`)
+			} else {
+				throw new Error(
+					`rolldown continuous release not found for ref ${options.rolldownRef} (HTTP ${status}): ${url}`,
+				)
+			}
+		}
 		const { root, vitePath, workspace } = await setupEnvironment()
 		const suitesToRun = getSuitesToRun(suites, root)
 		let viteMajor
 		if (!options.release) {
 			await setupViteRepo(options)
-			await buildVite({ verify: options.verify })
+			await buildVite({ verify: options.verify, rolldownRelease })
 			viteMajor = parseViteMajor(vitePath)
 		} else {
 			viteMajor = parseMajorVersion(options.release)
@@ -50,6 +66,7 @@ cli
 			viteMajor,
 			workspace,
 			release: options.release,
+			rolldownRelease,
 			verify: options.verify,
 			skipGit: false,
 		}
diff --git a/types.d.ts b/types.d.ts
index 55c24ae2..c7236a95 100644
--- a/types.d.ts
+++ b/types.d.ts
@@ -15,6 +15,7 @@ export interface RunOptions {
 	verify?: boolean
 	skipGit?: boolean
 	release?: string
+	rolldownRelease?: string
 	agent?: (typeof AGENTS)[number]
 	build?: Task | Task[]
 	test?: Task | Task[]
@@ -34,6 +35,7 @@ export interface CommandOptions {
 	release?: string
 	verify?: boolean
 	skipGit?: boolean
+	rolldownRef?: string
 }
 
 export interface RepoOptions {
diff --git a/utils.ts b/utils.ts
index 6e3ee361..a3a5b6d4 100644
--- a/utils.ts
+++ b/utils.ts
@@ -352,6 +352,9 @@ export async function runInRepo(options: RunOptions & RepoOptions) {
 			...localOverrides,
 		}
 	}
+	if (options.rolldownRelease) {
+		overrides.rolldown = options.rolldownRelease
+	}
 	await applyPackageOverrides(agent, dir, pkg, overrides)
 	await beforeBuildCommand?.(pkg.scripts)
 	await buildCommand?.(pkg.scripts)
@@ -414,12 +417,27 @@ export async function getPermanentRef() {
 	}
 }
 
-export async function buildVite({ verify = false }) {
+export async function buildVite({
+	verify = false,
+	rolldownRelease,
+}: { verify?: boolean; rolldownRelease?: string } = {}) {
 	cd(vitePath)
+
 	const frozenInstall = getCommand('pnpm', 'frozen')
 	const runBuild = getCommand('pnpm', 'run', ['build'])
 	const runTest = getCommand('pnpm', 'run', ['test'])
-	await $`${serializeCommand(frozenInstall)}`
+
+	if (rolldownRelease) {
+		const pkgFile = path.join(vitePath, 'package.json')
+		const pkg = JSON.parse(await fs.promises.readFile(pkgFile, 'utf-8'))
+		// Override rolldown in vite's monorepo so it builds against the specified version
+		await applyPackageOverrides('pnpm', vitePath, pkg, {
+			rolldown: rolldownRelease,
+		})
+		console.log(`overridden rolldown in vite repo with ${rolldownRelease}`)
+	} else {
+		await $`${serializeCommand(frozenInstall)}`
+	}
 	await $`${serializeCommand(runBuild)}`
 	if (verify) {
 		await $`${serializeCommand(runTest)}`