diff --git a/rollup.config.mjs b/rollup.config.mjs
index 2ba3a7d..4baf91c 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -23,7 +23,7 @@ function serve() {
   return {
     writeBundle() {
       if (server) return;
-      server = child_process.spawn("npm", ["run", "start", "--", "--dev"], {
+      server = child_process.spawn("yarn", ["start", "--dev"], {
         stdio: ["ignore", "inherit", "inherit"],
         shell: true,
       });