diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 01273a6..33ef41e 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -17,9 +17,10 @@ jobs:
             matrix:
                 os: [ ubuntu-latest ]
                 php: [ 8.5, 8.4, 8.3, 8.2 ]
+                mail-mime-parser: [ ^3.0, ^4.0 ]
                 dependency-version: [ prefer-stable ]
 
-        name: ${{ matrix.os }} - P${{ matrix.php }} - ${{ matrix.dependency-version }}
+        name: ${{ matrix.os }} - P${{ matrix.php }} - MMP${{ matrix.mail-mime-parser }} - ${{ matrix.dependency-version }}
 
         steps:
             -   name: Checkout code
@@ -29,7 +30,7 @@ jobs:
                 uses: actions/cache@v4
                 with:
                     path: ~/.composer/cache/files
-                    key: dependencies-laravel-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
+                    key: dependencies-laravel-php-${{ matrix.php }}-mmp-${{ matrix.mail-mime-parser }}-composer-${{ hashFiles('composer.json') }}
 
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
@@ -38,6 +39,7 @@ jobs:
 
             -   name: Install dependencies
                 run: |
+                    composer require "zbateson/mail-mime-parser:${{ matrix.mail-mime-parser }}" --no-update --no-interaction
                     composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction
 
             -   name: Execute tests
diff --git a/composer.json b/composer.json
index 0967fa7..2847af1 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
         "symfony/mime": ">=6.0",
         "nesbot/carbon": ">=2.0",
         "illuminate/collections": ">=9.0",
-        "zbateson/mail-mime-parser": "^3.0",
+        "zbateson/mail-mime-parser": "^3.0|^4.0",
         "egulias/email-validator": "^4.0"
     },
     "require-dev": {