diff --git a/TreeColumn.php b/TreeColumn.php
index 5d9eff3..575fbcd 100644
--- a/TreeColumn.php
+++ b/TreeColumn.php
@@ -3,14 +3,13 @@
 namespace leandrogehlen\treegrid;
 
 use Closure;
-use Yii;
 use yii\base\Model;
-use yii\base\Object;
+use yii\base\BaseObject;
 use yii\data\ActiveDataProvider;
 use yii\db\ActiveQueryInterface;
-use yii\helpers\ArrayHelper;
 use yii\helpers\Html;
 use yii\helpers\Inflector;
+use yii\helpers\ArrayHelper;
 
 /**
  * Column is the base class of all [[TreeGrid]] column classes.
@@ -18,7 +17,7 @@
  *
  * @author Leandro Gehlen <leandrogehlen@gmail.com>
  */
-class TreeColumn extends Object
+class TreeColumn extends BaseObject
 {
     /**
      * @var TreeGrid the grid view object that owns this column.
@@ -44,7 +43,7 @@ class TreeColumn extends Object
     public $content;
 
     /**
-     * @var boolean whether this column is visible. Defaults to true.
+     * @var bool whether this column is visible. Defaults to true.
      */
     public $visible = true;
 
@@ -96,7 +95,7 @@ class TreeColumn extends Object
     public $label;
 
     /**
-     * @var boolean whether the header label should be HTML-encoded.
+     * @var bool whether the header label should be HTML-encoded.
      * @see label
      */
     public $encodeLabel = true;
@@ -145,7 +144,7 @@ public function renderFooterCell()
      * Renders a data cell.
      * @param mixed $model the data model being rendered
      * @param mixed $key the key associated with the data model
-     * @param integer $index the zero-based index of the data item among the item array returned by [[GridView::dataProvider]].
+     * @param int $index the zero-based index of the data item among the item array returned by [[GridView::dataProvider]].
      * @return string the rendering result
      */
     public function renderDataCell($model, $key, $index)
@@ -208,7 +207,7 @@ protected function renderFooterCellContent()
      * Renders the data cell content.
      * @param mixed $model the data model
      * @param mixed $key the key associated with the data model
-     * @param integer $index the zero-based index of the data model among the models array returned by [[GridView::dataProvider]].
+     * @param int $index the zero-based index of the data model among the models array returned by [[GridView::dataProvider]].
      * @return string the rendering result
      */
     protected function renderDataCellContent($model, $key, $index)
@@ -228,7 +227,7 @@ protected function renderDataCellContent($model, $key, $index)
      * Returns the data cell value.
      * @param mixed $model the data model
      * @param mixed $key the key associated with the data model
-     * @param integer $index the zero-based index of the data model among the models array returned by [[GridView::dataProvider]].
+     * @param int $index the zero-based index of the data model among the models array returned by [[GridView::dataProvider]].
      * @return string the data cell value
      */
     public function getDataCellValue($model, $key, $index)
@@ -244,4 +243,4 @@ public function getDataCellValue($model, $key, $index)
         }
         return null;
     }
-} 
\ No newline at end of file
+}
diff --git a/TreeGrid.php b/TreeGrid.php
index dd8a5e3..69b5e33 100644
--- a/TreeGrid.php
+++ b/TreeGrid.php
@@ -2,14 +2,14 @@
 
 namespace leandrogehlen\treegrid;
 
-use Closure;
 use Yii;
-use yii\base\InvalidConfigException;
+use Closure;
 use yii\base\Widget;
+use yii\base\InvalidConfigException;
 use yii\grid\DataColumn;
-use yii\helpers\ArrayHelper;
 use yii\helpers\Html;
 use yii\helpers\Json;
+use yii\helpers\ArrayHelper;
 use yii\i18n\Formatter;
 
 /**
@@ -72,15 +72,15 @@ class TreeGrid extends Widget
     public $emptyTextOptions = ['class' => 'empty'];
 
     /**
-     * @var boolean whether to show the header section of the grid table.
+     * @var bool whether to show the header section of the grid table.
      */
     public $showHeader = true;
     /**
-     * @var boolean whether to show the footer section of the grid table.
+     * @var bool whether to show the footer section of the grid table.
      */
     public $showFooter = false;
     /**
-     * @var boolean whether to show the grid view if [[dataProvider]] returns no data.
+     * @var bool whether to show the grid view if [[dataProvider]] returns no data.
      */
     public $showOnEmpty = true;
 
@@ -407,4 +407,4 @@ protected function normalizeData(array $data, $parentId = null) {
         }
         return $result;
     }
-} 
+}
diff --git a/composer.json b/composer.json
index d5443e4..9f9167a 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "2.0.*",
+        "yiisoft/yii2": "~2.0.13",
         "bower-asset/jquery-treegrid": "0.3.0"
     },
     "require-dev": {
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..f9e19ab
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,930 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "3118f2a6692a536e2ad1988ec7f5d903",
+    "packages": [
+        {
+            "name": "bower-asset/inputmask",
+            "version": "3.3.11",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/RobinHerbots/Inputmask.git",
+                "reference": "5e670ad62f50c738388d4dcec78d2888505ad77b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/RobinHerbots/Inputmask/zipball/5e670ad62f50c738388d4dcec78d2888505ad77b",
+                "reference": "5e670ad62f50c738388d4dcec78d2888505ad77b",
+                "shasum": ""
+            },
+            "require": {
+                "bower-asset/jquery": ">=1.7"
+            },
+            "type": "bower-asset-library",
+            "extra": {
+                "bower-asset-main": [
+                    "./dist/inputmask/inputmask.js",
+                    "./dist/inputmask/inputmask.extensions.js",
+                    "./dist/inputmask/inputmask.date.extensions.js",
+                    "./dist/inputmask/inputmask.numeric.extensions.js",
+                    "./dist/inputmask/inputmask.phone.extensions.js",
+                    "./dist/inputmask/jquery.inputmask.js",
+                    "./dist/inputmask/global/document.js",
+                    "./dist/inputmask/global/window.js",
+                    "./dist/inputmask/phone-codes/phone.js",
+                    "./dist/inputmask/phone-codes/phone-be.js",
+                    "./dist/inputmask/phone-codes/phone-nl.js",
+                    "./dist/inputmask/phone-codes/phone-ru.js",
+                    "./dist/inputmask/phone-codes/phone-uk.js",
+                    "./dist/inputmask/dependencyLibs/inputmask.dependencyLib.jqlite.js",
+                    "./dist/inputmask/dependencyLibs/inputmask.dependencyLib.jquery.js",
+                    "./dist/inputmask/dependencyLibs/inputmask.dependencyLib.js",
+                    "./dist/inputmask/bindings/inputmask.binding.js"
+                ],
+                "bower-asset-ignore": [
+                    "**/*",
+                    "!dist/*",
+                    "!dist/inputmask/*",
+                    "!dist/min/*",
+                    "!dist/min/inputmask/*"
+                ]
+            },
+            "license": [
+                "http://opensource.org/licenses/mit-license.php"
+            ],
+            "description": "Inputmask is a javascript library which creates an input mask.  Inputmask can run against vanilla javascript, jQuery and jqlite.",
+            "keywords": [
+                "form",
+                "input",
+                "inputmask",
+                "jquery",
+                "mask",
+                "plugins"
+            ],
+            "time": "2017-11-21T11:46:23+00:00"
+        },
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+            "version": "3.2.1",
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+                "bower-asset-main": "dist/jquery.js",
+                "bower-asset-ignore": [
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+                ]
+            },
+            "license": [
+                "MIT"
+            ],
+            "keywords": [
+                "browser",
+                "javascript",
+                "jquery",
+                "library"
+            ],
+            "time": "2017-03-20T19:02:00+00:00"
+        },
+        {
+            "name": "bower-asset/jquery-treegrid",
+            "version": "0.3.0",
+            "source": {
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+                "url": "https://github.com/maxazan/jquery-treegrid.git",
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+                "bootstrap",
+                "javascript",
+                "jquery",
+                "plugin",
+                "treegrid",
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+            "version": "2.0.7.1",
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+                "php": ">=5.4.0"
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+                "cebe/indent": "*",
+                "facebook/xhprof": "*@dev",
+                "phpunit/phpunit": "4.1.*"
+            },
+            "bin": [
+                "bin/markdown"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1.x-dev"
+                }
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+                    "cebe\\markdown\\": ""
+                }
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
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+                    "email": "mail@cebe.cc",
+                    "homepage": "http://cebe.cc/",
+                    "role": "Creator"
+                }
+            ],
+            "description": "A super fast, highly extensible markdown parser for PHP",
+            "homepage": "https://github.com/cebe/markdown#readme",
+            "keywords": [
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+                "fast",
+                "gfm",
+                "markdown",
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+            },
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+            },
+            "require-dev": {
+                "simpletest/simpletest": "^1.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "HTMLPurifier": "library/"
+                },
+                "files": [
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+                ]
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+            "license": [
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+                    "email": "admin@htmlpurifier.org",
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+                }
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+            "description": "Standards compliant HTML filter written in PHP",
+            "homepage": "http://htmlpurifier.org/",
+            "keywords": [
+                "html"
+            ],
+            "time": "2017-06-03T02:28:16+00:00"
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+                "bower-asset/punycode": "1.3.*",
+                "bower-asset/yii2-pjax": "~2.0.1",
+                "cebe/markdown": "~1.0.0 | ~1.1.0",
+                "ext-ctype": "*",
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+                "php": ">=5.4.0",
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+                    "email": "qiang.xue@gmail.com",
+                    "homepage": "http://www.yiiframework.com/",
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+                    "email": "mail@cebe.cc",
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+                    "email": "resurtm@gmail.com",
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+            ],
+            "description": "Yii PHP Framework Version 2",
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+            "extra": {
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+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
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+            "autoload": {
+                "psr-4": {
+                    "yii\\composer\\": ""
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            "authors": [
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+                    "email": "qiang.xue@gmail.com"
+                }
+            ],
+            "description": "The composer plugin for Yii extension installer",
+            "keywords": [
+                "composer",
+                "extension installer",
+                "yii2"
+            ],
+            "time": "2016-12-20T13:26:02+00:00"
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+    "packages-dev": [
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