diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 115301f..a306550 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -4,30 +4,34 @@ on:
   pull_request:
   push:
     branches:
-      - "master"
+    - "master"
 
 jobs:
   phpunit:
     name: "PHPUnit tests"
 
-    runs-on: ${{ matrix.operating-system }}
+    runs-on: "ubuntu-latest"
 
     strategy:
       matrix:
         dependencies:
-          - "lowest"
           - "highest"
         php-version:
           - "7.2"
           - "7.3"
           - "7.4"
           - "8.0"
-        operating-system:
-          - "ubuntu-latest"
+          - "8.1"
+          - "8.2"
+          - "8.3"
+
+        include:
+          - php-version: '7.2'
+            dependencies: "lowest"
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: "actions/checkout@v4"
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -39,11 +43,11 @@ jobs:
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
-        run: "composer update --prefer-lowest --no-interaction --no-progress --no-suggest"
+        run: "composer update --prefer-lowest --no-interaction --no-progress"
 
       - name: "Install highest dependencies"
         if: ${{ matrix.dependencies == 'highest' }}
-        run: "composer update --no-interaction --no-progress --no-suggest"
+        run: "composer update --no-interaction --no-progress"
 
       - name: "Tests"
         run: "vendor/bin/phpunit"
diff --git a/README.md b/README.md
index 9261e92..130d776 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 [![PHPUnit tests](https://github.com/thephpleague/omnipay-common/actions/workflows/phpunit.yml/badge.svg)](https://github.com/thephpleague/omnipay-common/actions/workflows/phpunit.yml)
 [![Latest Version on Packagist][ico-version]][link-packagist]
-[![Software License][ico-license]](LICENSE.md)
+[![Software License][ico-license]](LICENSE)
 [![Total Downloads][ico-downloads]][link-downloads]
 
 [Omnipay](https://github.com/thephpleague/omnipay) is a framework agnostic, multi-gateway payment
@@ -21,10 +21,10 @@ Please see [UPGRADE](UPGRADE.md) for more information on how to upgrade to the l
 ## Support
 
 If you are having general issues with Omnipay, we suggest posting on
-[Stack Overflow](http://stackoverflow.com/). Be sure to add the
-[omnipay tag](http://stackoverflow.com/questions/tagged/omnipay) so it can be easily found.
+[Stack Overflow](https://stackoverflow.com/). Be sure to add the
+[omnipay tag](https://stackoverflow.com/questions/tagged/omnipay) so it can be easily found.
 
-If you want to keep up to date with release anouncements, discuss ideas for the project,
+If you want to keep up to date with release announcements, discuss ideas for the project,
 or ask more detailed questions, there is also a [mailing list](https://groups.google.com/forum/#!forum/omnipay) which
 you can subscribe to.
 
@@ -39,14 +39,11 @@ If you discover any security related issues, please email barryvdh@gmail.com ins
 
 ## License
 
-The MIT License (MIT). Please see [License File](LICENSE.md) for more information.
+The MIT License (MIT). Please see [License File](LICENSE) for more information.
 
 [ico-version]: https://img.shields.io/packagist/v/omnipay/common.svg?style=flat
 [ico-license]: https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat
-[ico-build]: https://img.shields.io/travis/thephpleague/omnipay-common/master.svg?style=flat
 [ico-downloads]: https://img.shields.io/packagist/dt/omnipay/common.svg?style=flat
 
 [link-packagist]: https://packagist.org/packages/omnipay/common
-[link-travis]: https://travis-ci.org/thephpleague/omnipay-common
 [link-downloads]: https://packagist.org/packages/omnipay/common
-[link-contributors]: ../../contributors
diff --git a/composer.json b/composer.json
index 793c66e..be27a33 100644
--- a/composer.json
+++ b/composer.json
@@ -47,14 +47,15 @@
         "php-http/message": "^1.5",
         "php-http/message-factory": "^1.1",
         "php-http/discovery": "^1.14",
-        "symfony/http-foundation": "^2.1|^3|^4|^5|^6",
+        "symfony/http-foundation": "^2.1|^3|^4|^5|^6|^7",
         "moneyphp/money": "^3.1|^4.0.3"
     },
     "require-dev": {
         "omnipay/tests": "^4.1",
-        "php-http/mock-client": "^1",
+        "php-http/mock-client": "^1.6",
         "php-http/guzzle7-adapter": "^1",
-        "squizlabs/php_codesniffer": "^3.5"
+        "squizlabs/php_codesniffer": "^3.8.1",
+        "http-interop/http-factory-guzzle": "^1.1"
     },
     "extra": {
         "branch-alias": {
@@ -70,5 +71,10 @@
         "fix-style": "phpcbf -p --standard=PSR2 src/"
     },
     "minimum-stability": "dev",
-    "prefer-stable": true
+    "prefer-stable": true,
+    "config": {
+        "allow-plugins": {
+            "php-http/discovery": true
+        }
+    }
 }