diff --git a/update.js b/update.js
index 1527763f..b816a055 100755
--- a/update.js
+++ b/update.js
@@ -1,5 +1,7 @@
 #!/usr/bin/env node
 
+'use strict'
+
 const fs = require('fs')
 
 const relative = require('require-relative')
diff --git a/upload.js b/upload.js
index 8de70fe4..711d9824 100755
--- a/upload.js
+++ b/upload.js
@@ -1,5 +1,7 @@
 #!/usr/bin/env node
 
+'use strict'
+
 const exec = require('child_process').execSync
 const url = require('url')