diff --git a/package.json b/package.json
index bea2605ff..2b42a1a00 100644
--- a/package.json
+++ b/package.json
@@ -5,8 +5,8 @@
     "promise-toolbox": "^0.8.0"
   },
   "scripts": {
-    "commit-msg": "lerna run test",
-    "install": "lerna bootstrap",
-    "test": "lerna run test"
+    "commit-msg": "yarn test",
+    "install": "lerna exec -- yarn",
+    "test": "lerna exec -- yarn test"
   }
 }
diff --git a/packages/xo-acl-resolver/package.json b/packages/xo-acl-resolver/package.json
index e84b3e93d..96fc159ae 100644
--- a/packages/xo-acl-resolver/package.json
+++ b/packages/xo-acl-resolver/package.json
@@ -36,8 +36,8 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prepublish": "yarn run build"
   },
   "standard": {
     "ignore": [
diff --git a/packages/xo-cli/package.json b/packages/xo-cli/package.json
index 94533bce7..94eb23c6d 100644
--- a/packages/xo-cli/package.json
+++ b/packages/xo-cli/package.json
@@ -47,7 +47,7 @@
   },
   "scripts": {
     "lint": "standard",
-    "posttest": "npm run lint"
+    "posttest": "yarn run lint"
   },
   "greenkeeper": {
     "ignore": [
diff --git a/packages/xo-collection/package.json b/packages/xo-collection/package.json
index 984e01739..22f1236d8 100644
--- a/packages/xo-collection/package.json
+++ b/packages/xo-collection/package.json
@@ -50,8 +50,8 @@
     "dev-test": "jest --bail --watch",
     "posttest": "standard && dependency-check ./package.json --entry dist/collection.js index.js unique-index.js view.js",
     "prebuild": "rimraf dist/",
-    "predev": "npm run prebuild",
-    "prepublish": "npm run build",
+    "predev": "yarn run prebuild",
+    "prepublish": "yarn run build",
     "test": "jest"
   },
   "babel": {
diff --git a/packages/xo-common/package.json b/packages/xo-common/package.json
index a1a40257e..f402f82dc 100644
--- a/packages/xo-common/package.json
+++ b/packages/xo-common/package.json
@@ -46,10 +46,10 @@
     "depcheck": "dependency-check ./package.json --entry api-errors.js",
     "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prebuild": "npm run clean",
-    "predev": "npm run clean",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prebuild": "yarn run clean",
+    "predev": "yarn run clean",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [
diff --git a/packages/xo-lib/package.json b/packages/xo-lib/package.json
index 2b3974e25..973cb7ea2 100644
--- a/packages/xo-lib/package.json
+++ b/packages/xo-lib/package.json
@@ -49,10 +49,10 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prebuild": "npm run clean",
-    "predev": "npm run clean",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prebuild": "yarn run clean",
+    "predev": "yarn run clean",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [
diff --git a/packages/xo-remote-parser/package.json b/packages/xo-remote-parser/package.json
index 2fd81f343..e5db72950 100644
--- a/packages/xo-remote-parser/package.json
+++ b/packages/xo-remote-parser/package.json
@@ -45,8 +45,8 @@
     "dev-test": "jest --bail --watch",
     "posttest": "standard && dependency-check ./package.json",
     "prebuild": "rimraf dist/",
-    "predev": "npm run prebuild",
-    "prepublish": "npm run build",
+    "predev": "yarn run prebuild",
+    "prepublish": "yarn run build",
     "test": "jest"
   },
   "babel": {
diff --git a/packages/xo-server-auth-github/package.json b/packages/xo-server-auth-github/package.json
index a42dc0751..652eabeec 100644
--- a/packages/xo-server-auth-github/package.json
+++ b/packages/xo-server-auth-github/package.json
@@ -52,8 +52,8 @@
     "dev": "NODE_DEV=development babel --watch --source-maps --out-dir=dist/ src/",
     "dev-test": "mocha --opts .mocha.opts --watch --reporter=min \"dist/**/*.spec.js\"",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prepublish": "npm run build",
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prepublish": "yarn run build",
     "test": "mocha --opts .mocha.opts \"dist/**/*.spec.js\""
   },
   "babel": {
diff --git a/packages/xo-server-auth-ldap/package.json b/packages/xo-server-auth-ldap/package.json
index 5b784ebdc..286617147 100644
--- a/packages/xo-server-auth-ldap/package.json
+++ b/packages/xo-server-auth-ldap/package.json
@@ -57,10 +57,10 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prebuild": "npm run clean",
-    "predev": "npm run clean",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prebuild": "yarn run clean",
+    "predev": "yarn run clean",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [
diff --git a/packages/xo-server-auth-saml/package.json b/packages/xo-server-auth-saml/package.json
index b9c4be806..20dd5d59a 100644
--- a/packages/xo-server-auth-saml/package.json
+++ b/packages/xo-server-auth-saml/package.json
@@ -52,10 +52,10 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prebuild": "npm run clean",
-    "predev": "npm run clean",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prebuild": "yarn run clean",
+    "predev": "yarn run clean",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [
diff --git a/packages/xo-server-backup-reports/package.json b/packages/xo-server-backup-reports/package.json
index 9cdb23348..579175abf 100644
--- a/packages/xo-server-backup-reports/package.json
+++ b/packages/xo-server-backup-reports/package.json
@@ -55,10 +55,10 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prebuild": "npm run clean",
-    "predev": "npm run clean",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prebuild": "yarn run clean",
+    "predev": "yarn run clean",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [
diff --git a/packages/xo-server-load-balancer/package.json b/packages/xo-server-load-balancer/package.json
index 89c0fdf04..61a5c9647 100644
--- a/packages/xo-server-load-balancer/package.json
+++ b/packages/xo-server-load-balancer/package.json
@@ -50,8 +50,8 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "NODE_DEV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [
diff --git a/packages/xo-server-transport-email/package.json b/packages/xo-server-transport-email/package.json
index 8d1fc4a3c..9ad24aac6 100644
--- a/packages/xo-server-transport-email/package.json
+++ b/packages/xo-server-transport-email/package.json
@@ -54,8 +54,8 @@
     "dev-test": "jest --bail --watch",
     "posttest": "standard && dependency-check ./package.json",
     "prebuild": "rimraf dist/",
-    "predev": "npm run prebuild",
-    "prepublish": "npm run build",
+    "predev": "yarn run prebuild",
+    "prepublish": "yarn run build",
     "test": "jest"
   },
   "babel": {
diff --git a/packages/xo-server-transport-nagios/package.json b/packages/xo-server-transport-nagios/package.json
index c67f9bc49..4ea283294 100644
--- a/packages/xo-server-transport-nagios/package.json
+++ b/packages/xo-server-transport-nagios/package.json
@@ -51,10 +51,10 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prebuild": "npm run clean",
-    "predev": "npm run clean",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prebuild": "yarn run clean",
+    "predev": "yarn run clean",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [
diff --git a/packages/xo-server-transport-xmpp/package.json b/packages/xo-server-transport-xmpp/package.json
index 328933bf4..48ac498cf 100644
--- a/packages/xo-server-transport-xmpp/package.json
+++ b/packages/xo-server-transport-xmpp/package.json
@@ -53,10 +53,10 @@
     "depcheck": "dependency-check ./package.json",
     "dev": "cross-env NODE_ENV=development babel --watch --source-maps --out-dir=dist/ src/",
     "lint": "standard",
-    "posttest": "npm run lint && npm run depcheck",
-    "prebuild": "npm run clean",
-    "predev": "npm run clean",
-    "prepublish": "npm run build"
+    "posttest": "yarn run lint && yarn run depcheck",
+    "prebuild": "yarn run clean",
+    "predev": "yarn run clean",
+    "prepublish": "yarn run build"
   },
   "babel": {
     "plugins": [