diff --git a/lerna.json b/lerna.json
index 1153a4a80..43177a933 100644
--- a/lerna.json
+++ b/lerna.json
@@ -1,4 +1,4 @@
 {
-  "lerna": "2.0.0-beta.37",
+  "lerna": "2.0.0-beta.38",
   "version": "0.0.1"
 }
diff --git a/package.json b/package.json
index 43d5cf438..3bb960e29 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "grunt-electron-installer": "2.x.x",
     "grunt-lesslint": "0.13.x",
     "jasmine": "2.x.x",
-    "lerna": "2.0.0-beta.37",
+    "lerna": "emorikawa/lerna#v2.0.0-beta.38.forked",
     "load-grunt-parent-tasks": "0.1.1",
     "pm2": "2.4.0",
     "request": "2.x.x",
diff --git a/scripts/postinstall.es6 b/scripts/postinstall.es6
index c5aa070ea..d41b5c2f1 100644
--- a/scripts/postinstall.es6
+++ b/scripts/postinstall.es6
@@ -55,7 +55,7 @@ async function installPrivateResources() {
 
 async function lernaBootstrap() {
   console.log("\n---> Installing packages");
-  await spawn("lerna", ["bootstrap", '--loglevel=silly'])
+  await spawn("lerna", ["bootstrap"])
 }
 
 const npmEnvs = {