diff --git a/app/Models/Tip.php b/app/Models/Tip.php
index 9185114..663a41a 100644
--- a/app/Models/Tip.php
+++ b/app/Models/Tip.php
@@ -57,7 +57,7 @@ class Tip extends Model
         return $this->belongsTo(Author::class, 'author_username', 'username');
     }
 
-    public function getTweetUrlAttribute(): string|null
+    public function getTweetUrlAttribute(): string
     {
         return "https://twitter.com/{$this->author_username}/status/{$this->tweet_id}";
     }
diff --git a/app/Twitter/Tweet.php b/app/Twitter/Tweet.php
index 2aebc87..a9fce52 100644
--- a/app/Twitter/Tweet.php
+++ b/app/Twitter/Tweet.php
@@ -12,14 +12,14 @@ class Tweet
     public string $id;
     public string $text;
     public TwitterUser $author;
-    public string|null $threadId = null;
+    public ?string $threadId = null;
     public array $images = [];
 
     public function __construct(
         string $id,
         string $text,
         TwitterUser $author,
-        string|null $threadId = null,
+        ?string $threadId = null,
         array $images = [],
     ) {
         $this->id = $id;