diff --git a/package.json b/package.json
index 0a2226b..6fc9855 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "oauth-signature",
   "description": "OAuth 1.0a signature generator (RFC 5849)",
-  "version": "1.3.1",
+  "version": "1.4.0",
   "author": "Marco Bettiolo <marco@bettiolo.it> (https://github.com/bettiolo)",
   "homepage": "https://github.com/bettiolo/oauth-signature-js",
   "repository": {