diff --git a/app/CaddyfilePatcher.php b/app/CaddyfilePatcher.php
index 4e4fe34..2c26efc 100644
--- a/app/CaddyfilePatcher.php
+++ b/app/CaddyfilePatcher.php
@@ -70,7 +70,7 @@ public function replacePort(int $newPort): self
     /**
      * Replaces the TLS snippet for the site with a new one.
      */
-    public function replaceTlsSnippet(TlsSetting $newTlsSetting, ?Certificate $certificate = null): self
+    public function replaceTlsSnippet(TlsSetting $newTlsSetting, Certificate $certificate = null): self
     {
         $lines = explode(PHP_EOL, $this->caddyfile);
 
diff --git a/app/Http/Controllers/Controller.php b/app/Http/Controllers/Controller.php
index 5775948..4c6d12d 100644
--- a/app/Http/Controllers/Controller.php
+++ b/app/Http/Controllers/Controller.php
@@ -33,7 +33,7 @@ protected function team(): Team
     /**
      * Log an activity.
      */
-    public function logActivity(string $description, ?Model $subject = null): ActivityLog
+    public function logActivity(string $description, Model $subject = null): ActivityLog
     {
         return ActivityLog::create([
             'team_id' => $this->team()->id,
diff --git a/app/Infrastructure/Entities/ServerType.php b/app/Infrastructure/Entities/ServerType.php
index d071e78..eb6908f 100644
--- a/app/Infrastructure/Entities/ServerType.php
+++ b/app/Infrastructure/Entities/ServerType.php
@@ -15,8 +15,8 @@ public function __construct(
         public readonly int $cpuCores,
         public readonly int $memoryInMb,
         public readonly int $storageInGb,
-        public readonly null|int $monthlyPriceAmount = null,
-        public readonly null|string $monthlyPriceCurrency = null,
+        public readonly ?int $monthlyPriceAmount = null,
+        public readonly ?string $monthlyPriceCurrency = null,
     ) {
 
         $memoryInGb = $this->memoryInMb / 1024;
diff --git a/app/Models/ServerTaskDispatcher.php b/app/Models/ServerTaskDispatcher.php
index 132ad53..7e6e14a 100644
--- a/app/Models/ServerTaskDispatcher.php
+++ b/app/Models/ServerTaskDispatcher.php
@@ -175,7 +175,7 @@ private function dispatchAndKeepTrack(): TaskModel
     /**
      * Dispatches the pending task.
      */
-    private function dispatchPendingTask(): ProcessOutput|null
+    private function dispatchPendingTask(): ?ProcessOutput
     {
         try {
             $processOutput = $this->pendingTask->dispatch();
diff --git a/app/Models/Site.php b/app/Models/Site.php
index 3e67e6a..ee5920f 100644
--- a/app/Models/Site.php
+++ b/app/Models/Site.php
@@ -239,7 +239,7 @@ public function deploy(array $environmentVariables = [], User $user = null): Dep
     /**
      * Updates the site's Caddyfile with the given PHP version and web folder.
      */
-    public function updateCaddyfile(PhpVersion $phpVersion, string $webFolder, ?User $user = null): void
+    public function updateCaddyfile(PhpVersion $phpVersion, string $webFolder, User $user = null): void
     {
         $this->pending_caddyfile_update_since = now();
         $this->save();
diff --git a/app/Models/Team.php b/app/Models/Team.php
index 78dfe3c..e6d95aa 100644
--- a/app/Models/Team.php
+++ b/app/Models/Team.php
@@ -68,7 +68,7 @@ public function subscriptionOptions(): TeamSubscriptionOptions
     /**
      * Get the email address that should be associated with the Paddle customer.
      */
-    public function paddleEmail(): string|null
+    public function paddleEmail(): ?string
     {
         /** @var User */
         $owner = $this->owner;
diff --git a/app/Tasks/Task.php b/app/Tasks/Task.php
index 5cd86b8..adb6e94 100644
--- a/app/Tasks/Task.php
+++ b/app/Tasks/Task.php
@@ -24,7 +24,7 @@ public function onOutputUpdated(string $output): void
     {
     }
 
-    public function callbackUrl(): string|null
+    public function callbackUrl(): ?string
     {
         return $this instanceof HasCallbacks ? $this->taskModel?->callbackUrl() : null;
     }