diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 843482e..5bd4790 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [7.1, 7.2, 7.3, 8.0, 8.1]
+        php: [8.1,8.2,8.3]
     steps:
     - uses: actions/checkout@v2
     - uses: shivammathur/setup-php@v2
diff --git a/.travis.yml b/.travis.yml
index d56377f..bf32ebe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,9 @@
 language: php
 
 php:
-  - 5.6
-  - 7.0
-  - 7.1
-  - 7.2
-  - 7.3
-  - 8.0
   - 8.1
+  - 8.2
+  - 8.3
 
 sudo: false
 
diff --git a/src/Model.php b/src/Model.php
index 03bc74a..01f0fb4 100644
--- a/src/Model.php
+++ b/src/Model.php
@@ -4,8 +4,8 @@
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Contracts\Support\Jsonable;
 use Illuminate\Support\Arr;
-use Illuminate\Support\Str;
 use Illuminate\Support\Collection as BaseCollection;
+use Illuminate\Support\Str;
 use JsonSerializable;
 
 abstract class Model implements ArrayAccess, Arrayable, Jsonable, JsonSerializable
@@ -863,7 +863,7 @@ public function __set($key, $value)
      * @param  mixed  $offset
      * @return bool
      */
-    public function offsetExists($offset): bool
+    public function offsetExists(mixed $offset): bool
     {
         return isset($this->$offset);
     }
@@ -872,9 +872,8 @@ public function offsetExists($offset): bool
      * Get the value for a given offset.
      *
      * @param  mixed  $offset
-     * @return mixed
-     */
-    public function offsetGet($offset): mixed
+     * @return mix
+    public function offsetGet(mixed $offset): mixed
     {
         return $this->$offset;
     }
@@ -886,7 +885,7 @@ public function offsetGet($offset): mixed
      * @param  mixed  $value
      * @return void
      */
-    public function offsetSet($offset, $value): void
+    public function offsetSet(mixed $offset, mixed $value): void
     {
         $this->$offset = $value;
     }
@@ -897,7 +896,7 @@ public function offsetSet($offset, $value): void
      * @param  mixed  $offset
      * @return void
      */
-    public function offsetUnset($offset): void
+    public function offsetUnset(mixed $offset): void
     {
         unset($this->$offset);
     }