diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index 5008ddf..0000000
Binary files a/.DS_Store and /dev/null differ
diff --git a/README.md b/README.md
index d651f69..ed31a59 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,11 @@ _**Note:** this interface allows the admin to directly edit the language files s
 > ### Security updates and breaking changes
 > Please **[subscribe to the Backpack Newsletter](http://backpackforlaravel.com/newsletter)** so you can find out about any security updates, breaking changes or major features. We send an email every 1-2 months.
 
-## Install in Backpack 4.1 (Laravel 6 or 7)
+## Upgrading from 3.x to 4.x
+
+- Flags are no longer supported on the Language CRUD, until version 3 admins could browse an image for the language flag, we now recommend developers to setup those images in advance, having them in a public folder like `public\flags\en.svg` `public\flags\ro.svg`.
+
+## Install in Backpack 4.1 or 5.0 (Laravel 6, 7, 8 or 9)
 
 ### Step 1. Install via Composer
 
@@ -93,7 +97,7 @@ Or just try at **your-project-domain/admin/language/texts**
 
 ## Screenshots
 
-See http://laravelbackpack.com
+See https://backpackforlaravel.com/
 
 ## Change log
 
diff --git a/composer.json b/composer.json
index fe5aa09..2ea30dd 100644
--- a/composer.json
+++ b/composer.json
@@ -33,10 +33,10 @@
         }
     ],
     "require": {
-        "backpack/crud": "^4.1.0"
+        "backpack/crud": "^5.0"
     },
     "require-dev": {
-        "phpunit/phpunit" : "4.*",
+        "phpunit/phpunit" : "^9.0",
         "scrutinizer/ocular": "~1.1"
     },
     "autoload": {
diff --git a/src/app/Http/Controllers/LanguageCrudController.php b/src/app/Http/Controllers/LanguageCrudController.php
index c772298..6b40e94 100644
--- a/src/app/Http/Controllers/LanguageCrudController.php
+++ b/src/app/Http/Controllers/LanguageCrudController.php
@@ -65,7 +65,7 @@ public function setupCreateOperation()
         $this->crud->addField([
             'name' => 'flag',
             'label' => trans('backpack::langfilemanager.flag_image'),
-            'type' => 'browse',
+            'type' => backpack_pro() ? 'browse' : 'text',
         ]);
         $this->crud->addField([
             'name' => 'active',
@@ -97,8 +97,7 @@ public function store()
     /**
      * After delete remove also the language folder.
      *
-     * @param int $id
-     *
+     * @param  int  $id
      * @return string
      */
     public function destroy($id)
diff --git a/src/app/Services/LangFiles.php b/src/app/Services/LangFiles.php
index b5d64f0..4370a2d 100644
--- a/src/app/Services/LangFiles.php
+++ b/src/app/Services/LangFiles.php
@@ -29,7 +29,8 @@ public function setFile($file)
 
     /**
      * Get the content of a language file as an array sorted ascending.
-     * @return  array|false
+     *
+     * @return array|false
      */
     public function getFileContent()
     {
@@ -47,8 +48,9 @@ public function getFileContent()
 
     /**
      * Rewrite the file with the modified texts.
-     * @param   array       $postArray  the data received from the form
-     * @return  int
+     *
+     * @param  array  $postArray  the data received from the form
+     * @return int
      */
     public function setFileContent($postArray)
     {
@@ -65,7 +67,8 @@ public function setFileContent($postArray)
     /**
      * Get the language files that can be edited,
      * to ignore a file add it in the config/admin file to language_ignore key.
-     * @return  array
+     *
+     * @return array
      */
     public function getlangFiles()
     {
@@ -94,8 +97,9 @@ public function getlangFiles()
 
     /**
      * Check if all the fields were completed.
-     * @param   array       $postArray      the array containing the data
-     * @return  array
+     *
+     * @param  array  $postArray  the array containing the data
+     * @return array
      */
     public function testFields($postArray)
     {
@@ -122,11 +126,12 @@ public function testFields($postArray)
 
     /**
      * Display the form that permits the editing.
-     * @param   array       $fileArray      the array with all the texts
-     * @param   array       $parents        all the ancestor keys of the current key
-     * @param   string      $parent         the parent key of the current key
-     * @param   int         $level          the current level
-     * @return  void
+     *
+     * @param  array  $fileArray  the array with all the texts
+     * @param  array  $parents  all the ancestor keys of the current key
+     * @param  string  $parent  the parent key of the current key
+     * @param  int  $level  the current level
+     * @return void
      */
     public function displayInputs($fileArray, $parents = [], $parent = '', $level = 0)
     {
@@ -157,7 +162,8 @@ public function displayInputs($fileArray, $parents = [], $parent = '', $level =
 
     /**
      * Create the array that will be saved in the file.
-     * @param array $postArray The array to be transformed
+     *
+     * @param  array  $postArray  The array to be transformed
      * @return array
      */
     private function prepareContent($postArray)
@@ -194,8 +200,9 @@ function ($item1, $item2) {
 
     /**
      * Add filters to the values inserted by the user.
-     * @param   string      $str        the string to be sanitized
-     * @return  string
+     *
+     * @param  string  $str  the string to be sanitized
+     * @return string
      */
     private function sanitize($str)
     {
@@ -204,10 +211,11 @@ private function sanitize($str)
 
     /**
      * Set a value in a multidimensional array when knowing the keys.
-     * @param   array       $data       the array that will be modified
-     * @param   array       $keys       the keys (path)
-     * @param   string      $value      the value to be added
-     * @return  array
+     *
+     * @param  array  $data  the array that will be modified
+     * @param  array  $keys  the keys (path)
+     * @param  string  $value  the value to be added
+     * @return array
      */
     private function setArrayValue(&$data, $keys, $value)
     {