diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index b9c47e8..9747228 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0778da5..fd44f8c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 10
       matrix:
-        php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
+        php: ['8.2', '8.3', '8.4', '8.5']
 
     steps:
       - name: Set up PHP
@@ -23,7 +23,7 @@ jobs:
           coverage: none
 
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Initialize tests
         run: make initialize
@@ -31,8 +31,7 @@ jobs:
       - name: Download dependencies
         run: |
           composer config minimum-stability dev
-          composer req symfony/phpunit-bridge --no-update
           composer update --no-interaction --prefer-dist --optimize-autoloader --prefer-stable
 
       - name: Run tests
-        run: ./vendor/bin/simple-phpunit
+        run: ./vendor/bin/phpunit
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 342f019..01df470 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 ## NOT RELEASED
 
+### Dependency bumped
+
+- Drop support for PHP versions lower than 8.2
+
+### Changed
+
+- Apply new CodingStandard from latest php-cs-fixer.
+
 ## 1.1.4
 
 ### Changed
diff --git a/Makefile b/Makefile
index 850dffc..771133a 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ start-docker:
 	echo "Noop"
 
 test: initialize
-	./vendor/bin/simple-phpunit
+	./vendor/bin/phpunit
 
 clean: stop-docker
 stop-docker:
diff --git a/README.md b/README.md
index 972f310..50bad94 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # AsyncAws IotData Client
 
-![](https://github.com/async-aws/iot-data/workflows/Tests/badge.svg?branch=master)
-![](https://github.com/async-aws/iot-data/workflows/BC%20Check/badge.svg?branch=master)
+![CI](https://github.com/async-aws/iot-data/actions/workflows/ci.yml/badge.svg?branch=master)
+![BC Check](https://github.com/async-aws/iot-data/actions/workflows/checks.yml/badge.svg?branch=master)
 
 An API client for IotData.
 
diff --git a/composer.json b/composer.json
index cbc70f3..a9c4a07 100644
--- a/composer.json
+++ b/composer.json
@@ -11,9 +11,14 @@
         "iot-data"
     ],
     "require": {
-        "php": "^7.2.5 || ^8.0",
+        "php": "^8.2",
         "async-aws/core": "^1.9"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^11.5.42",
+        "symfony/error-handler": "^7.3.2 || ^8.0",
+        "symfony/phpunit-bridge": "^7.3.2 || ^8.0"
+    },
     "autoload": {
         "psr-4": {
             "AsyncAws\\IotData\\": "src"
@@ -26,7 +31,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.1-dev"
+            "dev-master": "1.2-dev"
         }
     }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 9894ce3..20f6abf 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,17 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.5/phpunit.xsd"
          backupGlobals="false"
          colors="true"
          bootstrap="vendor/autoload.php"
          failOnRisky="true"
          failOnWarning="true"
+         failOnDeprecation="true"
+         failOnNotice="true"
 >
-  <coverage>
+  <source ignoreSuppressionOfDeprecations="true">
     <include>
       <directory>./src</directory>
     </include>
-  </coverage>
+    <deprecationTrigger>
+      <function>trigger_deprecation</function>
+    </deprecationTrigger>
+  </source>
   <php>
     <ini name="error_reporting" value="-1"/>
   </php>
@@ -20,4 +25,7 @@
       <directory>./tests/</directory>
     </testsuite>
   </testsuites>
+  <extensions>
+    <bootstrap class="Symfony\Bridge\PhpUnit\SymfonyExtension"/>
+  </extensions>
 </phpunit>
diff --git a/src/Input/GetThingShadowRequest.php b/src/Input/GetThingShadowRequest.php
index 21e5b69..1b2174d 100644
--- a/src/Input/GetThingShadowRequest.php
+++ b/src/Input/GetThingShadowRequest.php
@@ -31,7 +31,7 @@ final class GetThingShadowRequest extends Input
     /**
      * @param array{
      *   thingName?: string,
-     *   shadowName?: null|string,
+     *   shadowName?: string|null,
      *   '@region'?: string|null,
      * } $input
      */
@@ -45,7 +45,7 @@ public function __construct(array $input = [])
     /**
      * @param array{
      *   thingName?: string,
-     *   shadowName?: null|string,
+     *   shadowName?: string|null,
      *   '@region'?: string|null,
      * }|GetThingShadowRequest $input
      */
diff --git a/src/Input/UpdateThingShadowRequest.php b/src/Input/UpdateThingShadowRequest.php
index a1d9399..165c416 100644
--- a/src/Input/UpdateThingShadowRequest.php
+++ b/src/Input/UpdateThingShadowRequest.php
@@ -40,7 +40,7 @@ final class UpdateThingShadowRequest extends Input
     /**
      * @param array{
      *   thingName?: string,
-     *   shadowName?: null|string,
+     *   shadowName?: string|null,
      *   payload?: string,
      *   '@region'?: string|null,
      * } $input
@@ -56,7 +56,7 @@ public function __construct(array $input = [])
     /**
      * @param array{
      *   thingName?: string,
-     *   shadowName?: null|string,
+     *   shadowName?: string|null,
      *   payload?: string,
      *   '@region'?: string|null,
      * }|UpdateThingShadowRequest $input
diff --git a/src/IotDataClient.php b/src/IotDataClient.php
index 4469ad9..712b465 100644
--- a/src/IotDataClient.php
+++ b/src/IotDataClient.php
@@ -39,7 +39,7 @@ class IotDataClient extends AbstractApi
      *
      * @param array{
      *   thingName: string,
-     *   shadowName?: null|string,
+     *   shadowName?: string|null,
      *   '@region'?: string|null,
      * }|GetThingShadowRequest $input
      *
@@ -84,7 +84,7 @@ public function getThingShadow($input): GetThingShadowResponse
      *
      * @param array{
      *   thingName: string,
-     *   shadowName?: null|string,
+     *   shadowName?: string|null,
      *   payload: string,
      *   '@region'?: string|null,
      * }|UpdateThingShadowRequest $input