diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index ce2b08e..c57a3b0 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -30,10 +30,8 @@ jobs:
     name: PHP:${{ matrix.php }} with PHPUnit:${{ matrix.phpunit }} on ${{ matrix.os }} (${{ matrix.dependencies }})
 
     steps:
-      - name: Checkout repository and submodules
+      - name: Checkout repository
         uses: actions/checkout@v4
-        with:
-          submodules: recursive
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index 665ea14..0000000
--- a/.gitmodules
+++ /dev/null
@@ -1,4 +0,0 @@
-[submodule "core"]
-	path = core
-	url = https://github.com/orchestral/testbench-core.git
-    branch = 6.x
diff --git a/bin/sync b/bin/sync
index bdd7f99..0dfb62b 100755
--- a/bin/sync
+++ b/bin/sync
@@ -10,35 +10,25 @@ $files = new Illuminate\Filesystem\Filesystem();
 
 echo ">>>> Checkout branch {$BRANCH}".PHP_EOL;
 
-Illuminate\Support\Collection::make([
-    "git checkout $BRANCH",
-    "git submodule init",
-    "git submodule foreach git reset --hard HEAD",
-    "git submodule foreach git checkout $BRANCH",
-    "git submodule foreach git pull",
-])->each(function ($command) use ($workingPath) {
-    Symfony\Component\Process\Process::fromShellCommandline($command, $workingPath)->mustRun();
-});
-
-$files->copy("{$workingPath}/core/testbench.yaml", "{$workingPath}/testbench.yaml");
+$files->copy("{$workingPath}/vendor/orchestra/testbench-core/testbench.yaml", "{$workingPath}/testbench.yaml");
 
 Illuminate\Support\Collection::make([
-    ...$files->glob("{$workingPath}/core/workbench/app/*"),
+    ...$files->glob("{$workingPath}/vendor/orchestra/testbench-core/workbench/app/*"),
 ])->flatten()
 ->filter(fn ($file) => is_file($file))
 ->each(function ($file) use ($files, $workingPath) {
-    $files->copy($file, "{$workingPath}/workbench".Illuminate\Support\Str::after($file, "{$workingPath}/core/workbench"));
+    $files->copy($file, "{$workingPath}/workbench".Illuminate\Support\Str::after($file, "{$workingPath}/vendor/orchestra/testbench-core/workbench"));
 });
 
 Illuminate\Support\Collection::make([
-    ...$files->glob("{$workingPath}/core/workbench/config/*.php"),
-    ...$files->glob("{$workingPath}/core/workbench/config/*/*.php"),
-    ...$files->glob("{$workingPath}/core/workbench/routes/*"),
-    ...$files->glob("{$workingPath}/core/workbench/resources/lang/en/*"),
-    ...$files->glob("{$workingPath}/core/workbench/resources/views/components/*"),
-    ...$files->glob("{$workingPath}/core/workbench/resources/views/*"),
+    ...$files->glob("{$workingPath}/vendor/orchestra/testbench-core/workbench/config/*.php"),
+    ...$files->glob("{$workingPath}/vendor/orchestra/testbench-core/workbench/config/*/*.php"),
+    ...$files->glob("{$workingPath}/vendor/orchestra/testbench-core/workbench/routes/*"),
+    ...$files->glob("{$workingPath}/vendor/orchestra/testbench-core/workbench/resources/lang/en/*"),
+    ...$files->glob("{$workingPath}/vendor/orchestra/testbench-core/workbench/resources/views/components/*"),
+    ...$files->glob("{$workingPath}/vendor/orchestra/testbench-core/workbench/resources/views/*"),
 ])->flatten()
 ->filter(fn ($file) => is_file($file))
 ->each(function ($file) use ($files, $workingPath) {
-    $files->copy($file, "{$workingPath}/workbench".Illuminate\Support\Str::after($file, "{$workingPath}/core/workbench"));
+    $files->copy($file, "{$workingPath}/workbench".Illuminate\Support\Str::after($file, "{$workingPath}/vendor/orchestra/testbench-core/workbench"));
 });
diff --git a/composer.json b/composer.json
index 1a46091..bfdfd35 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,13 @@
         "phpunit/phpunit": "^8.5.21 || ^9.5.10",
         "spatie/laravel-ray": "^1.29.7"
     },
+    "config": {
+        "preferred-install": {
+            "orchestra/testbench-core": "source",
+            "*": "auto"
+        },
+        "sort-packages": true
+    },
     "scripts": {
         "post-autoload-dump": "@prepare",
         "prepare": "@php vendor/bin/testbench package:discover --ansi",
@@ -36,9 +43,6 @@
             "@test"
         ]
     },
-    "config": {
-        "sort-packages": true
-    },
     "prefer-stable": true,
     "minimum-stability": "dev"
 }
diff --git a/core b/core
deleted file mode 160000
index 846a9b5..0000000
--- a/core
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 846a9b59f431d1e130b7522473173d2cb45fbabb
diff --git a/phpunit.xml b/phpunit.xml
index 3c155f5..7ef474e 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -19,7 +19,7 @@
     </coverage>
     <testsuites>
         <testsuite name="Testbench Test Suite">
-            <directory suffix="Test.php">./core/tests/</directory>
+            <directory suffix="Test.php">./vendor/orchestra/testbench-core/tests/</directory>
         </testsuite>
     </testsuites>
     <groups>