diff --git a/.gitattributes b/.gitattributes
index e509729..8da2d2e 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -10,3 +10,4 @@
 /phpunit.xml        export-ignore
 /tests              export-ignore
 /.editorconfig      export-ignore
+/phpstan.neon       export-ignore
diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index f33d577..49519a0 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -55,6 +55,7 @@ jobs:
           - 8.1
           - 8.2
           - 8.3
+          - 8.4
         laravel-constraint:
           - 10.*
           - 11.*
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..9813f3a
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,5 @@
+parameters:
+    ignoreErrors:
+        - '#Trait Laragear\\Meta\\BootHelpers is used zero times and is not analysed\.#'
+        - '#Trait Laragear\\Meta\\Console\\Commands\\WithEnvironmentFile is used zero times and is not analysed\.#'
+        - '#Trait Laragear\\Meta\\Database\\Eloquent\\ExtendsBuilder is used zero times and is not analysed\.#'
diff --git a/src/BootHelpers.php b/src/BootHelpers.php
index dc3d920..ed17e30 100644
--- a/src/BootHelpers.php
+++ b/src/BootHelpers.php
@@ -24,7 +24,7 @@ trait BootHelpers
      * @param  callable|string|null  $callback
      * @return void
      */
-    protected function withDriver(string $service, string|array $driver, callable|string $callback = null): void
+    protected function withDriver(string $service, string|array $driver, callable|string|null $callback = null): void
     {
         if (is_string($driver)) {
             $driver = [$driver => $callback];
@@ -49,7 +49,7 @@ protected function withDriver(string $service, string|array $driver, callable|st
     protected function withValidationRule(
         string $rule,
         callable|string $callback,
-        callable|string $message = null,
+        callable|string|null $message = null,
         bool $implicit = false
     ): void {
         $this->callAfterResolving(
diff --git a/src/Http/Middleware/MiddlewareDeclaration.php b/src/Http/Middleware/MiddlewareDeclaration.php
index 8d489e4..497b397 100644
--- a/src/Http/Middleware/MiddlewareDeclaration.php
+++ b/src/Http/Middleware/MiddlewareDeclaration.php
@@ -89,7 +89,7 @@ public function last(): void
      * @param  (callable(\Illuminate\Contracts\Foundation\Application):TValue)|null  $callback
      * @return $this
      */
-    public function shared(callable $callback = null): static
+    public function shared(?callable $callback = null): static
     {
         $this->kernel->getApplication()->singleton($this->middleware, $callback);