diff --git a/package.json b/package.json
index a3c7a0a..a843937 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   "devDependencies": {
     "bannerify": "^1.0.1",
     "browserify": "^16.5.0",
+    "browserify-versionify": "^1.0.6",
     "mocha": "^6.2.0",
     "power-assert": "^1.6.1",
     "uglify-js": "^3.6.0",
@@ -23,6 +24,11 @@
     "build": "npm run compile && npm run minify",
     "test": "npm run build && mocha tests/test"
   },
+  "browserify": {
+    "transform": [
+      ["browserify-versionify", { "placeholder": "__VERSION__" }]
+    ]
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/polygonplanet/encoding.js.git"
diff --git a/src/index.js b/src/index.js
index 8327042..1021b5f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -7,6 +7,7 @@ var KanaCaseTable = require('./kana-case-table');
 var hasOwnProperty = Object.prototype.hasOwnProperty;
 
 var Encoding = {
+  version: '__VERSION__',
 
   /**
    * Encoding orders