diff --git a/README.md b/README.md
index 035fdc9..dab106f 100644
--- a/README.md
+++ b/README.md
@@ -1104,7 +1104,7 @@ The server will handle it as:
 If your backend body-parser (like `body-parser` of `express.js`) supports nested objects decoding, you will get the same object on the server-side automatically
 
 ```js
-  var app = express();
+  const app = express();
 
   app.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies
 
diff --git a/lib/helpers/spread.js b/lib/helpers/spread.js
index 13479cb..2e72fc8 100644
--- a/lib/helpers/spread.js
+++ b/lib/helpers/spread.js
@@ -7,7 +7,7 @@
  *
  *  ```js
  *  function f(x, y, z) {}
- *  var args = [1, 2, 3];
+ *  const args = [1, 2, 3];
  *  f.apply(null, args);
  *  ```
  *
diff --git a/lib/utils.js b/lib/utils.js
index ed08161..68bab35 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -333,7 +333,7 @@ const isContextDefined = (context) => !isUndefined(context) && context !== _glob
  * Example:
  *
  * ```js
- * var result = merge({foo: 123}, {foo: 456});
+ * const result = merge({foo: 123}, {foo: 456});
  * console.log(result.foo); // outputs 456
  * ```
  *