diff --git a/app/Application.php b/app/Application.php
index 65288106..17a2347a 100644
--- a/app/Application.php
+++ b/app/Application.php
@@ -43,7 +43,7 @@ class Application extends Model
         $name = $this->name;
         $name = preg_replace('/[^\p{L}\p{N}]/u', '', $name);
 
-        $class = '\App\SupportedApps\\'.$name.'\\'.$name;
+        $class = \App\SupportedApps::class.$name.'\\'.$name;
 
         return $class;
     }
@@ -52,7 +52,7 @@ class Application extends Model
     {
         $name = preg_replace('/[^\p{L}\p{N}]/u', '', $name);
 
-        $class = '\App\SupportedApps\\'.$name.'\\'.$name;
+        $class = \App\SupportedApps::class.$name.'\\'.$name;
 
         return $class;
     }
@@ -114,7 +114,7 @@ class Application extends Model
             return null;
         }
         $classname = preg_replace('/[^\p{L}\p{N}]/u', '', $app->name);
-        $app->class = '\App\SupportedApps\\'.$classname.'\\'.$classname;
+        $app->class = \App\SupportedApps::class.$classname.'\\'.$classname;
 
         return $app;
     }
diff --git a/app/Item.php b/app/Item.php
index 0e3f75ae..505ddf04 100644
--- a/app/Item.php
+++ b/app/Item.php
@@ -84,12 +84,12 @@ class Item extends Model
 
     public function parents()
     {
-        return $this->belongsToMany('App\Item', 'item_tag', 'item_id', 'tag_id');
+        return $this->belongsToMany(\App\Item::class, 'item_tag', 'item_id', 'tag_id');
     }
 
     public function children()
     {
-        return $this->belongsToMany('App\Item', 'item_tag', 'tag_id', 'item_id');
+        return $this->belongsToMany(\App\Item::class, 'item_tag', 'tag_id', 'item_id');
     }
 
     public function getLinkAttribute()
@@ -257,6 +257,6 @@ class Item extends Model
      */
     public function user()
     {
-        return $this->belongsTo('App\User');
+        return $this->belongsTo(\App\User::class);
     }
 }
diff --git a/app/Setting.php b/app/Setting.php
index 5c4d3b32..69bede8c 100644
--- a/app/Setting.php
+++ b/app/Setting.php
@@ -147,7 +147,7 @@ class Setting extends Model
 
     public function group()
     {
-        return $this->belongsTo('App\SettingGroup', 'group_id');
+        return $this->belongsTo(\App\SettingGroup::class, 'group_id');
     }
 
     /**
@@ -232,7 +232,7 @@ class Setting extends Model
      */
     public function users()
     {
-        return $this->belongsToMany('App\User')->using('App\SettingUser')->withPivot('uservalue');
+        return $this->belongsToMany(\App\User::class)->using(\App\SettingUser::class)->withPivot('uservalue');
     }
 
     public static function user()
diff --git a/app/SettingGroup.php b/app/SettingGroup.php
index 5c306caf..45d05d48 100644
--- a/app/SettingGroup.php
+++ b/app/SettingGroup.php
@@ -22,6 +22,6 @@ class SettingGroup extends Model
 
     public function settings()
     {
-        return $this->hasMany('App\Setting', 'group_id');
+        return $this->hasMany(\App\Setting::class, 'group_id');
     }
 }
diff --git a/app/User.php b/app/User.php
index 8a8a76f1..36658f54 100644
--- a/app/User.php
+++ b/app/User.php
@@ -32,7 +32,7 @@ class User extends Authenticatable
      */
     public function items()
     {
-        return $this->hasMany('App\Item');
+        return $this->hasMany(\App\Item::class);
     }
 
     /**
@@ -40,7 +40,7 @@ class User extends Authenticatable
      */
     public function settings()
     {
-        return $this->belongsToMany('App\Setting')->withPivot('uservalue');
+        return $this->belongsToMany(\App\Setting::class)->withPivot('uservalue');
     }
 
     public static function currentUser()