diff --git a/app/Form/Models/Participant.php b/app/Form/Models/Participant.php
index 96c055c6..a1974425 100644
--- a/app/Form/Models/Participant.php
+++ b/app/Form/Models/Participant.php
@@ -52,6 +52,9 @@ class Participant extends Model implements Preventable
         return $filter->apply($query);
     }
 
+    /**
+     * @return BelongsTo<Member, self>
+     */
     public function member(): BelongsTo
     {
         return $this->belongsTo(Member::class);
diff --git a/app/Member/Member.php b/app/Member/Member.php
index fe5de866..69759e5b 100644
--- a/app/Member/Member.php
+++ b/app/Member/Member.php
@@ -351,7 +351,7 @@ class Member extends Model implements Geolocatable
             return [];
         }
 
-        /** @var array<int, Prevention */
+        /** @var array<int, Prevention> */
         $preventions = [];
 
         if ($this->efz === null || $this->efz->diffInYears($date) >= 5) {
diff --git a/app/Prevention/Mails/PreventionRememberMail.php b/app/Prevention/Mails/PreventionRememberMail.php
index f423c575..e2833701 100644
--- a/app/Prevention/Mails/PreventionRememberMail.php
+++ b/app/Prevention/Mails/PreventionRememberMail.php
@@ -5,6 +5,7 @@ namespace App\Prevention\Mails;
 use App\Invoice\InvoiceSettings;
 use App\Prevention\Contracts\Preventable;
 use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Attachment;
 use Illuminate\Mail\Mailable;
 use Illuminate\Mail\Mailables\Content;
 use Illuminate\Mail\Mailables\Envelope;
@@ -53,9 +54,9 @@ class PreventionRememberMail extends Mailable
     /**
      * Get the attachments for the message.
      *
-     * @return array
+     * @return array<int, Attachment>
      */
-    public function attachments()
+    public function attachments(): array
     {
         return [];
     }
diff --git a/tests/Feature/Member/PreventionTest.php b/tests/Feature/Member/PreventionTest.php
index 9a662ace..d0b3519e 100644
--- a/tests/Feature/Member/PreventionTest.php
+++ b/tests/Feature/Member/PreventionTest.php
@@ -91,7 +91,7 @@ class PreventionTest extends TestCase
         $this->assertNull($participant->fresh()->last_remembered_at);
     }
 
-    private function attributes(): Generator
+    protected function attributes(): Generator
     {
         yield [
             'attrs' => ['efz' => null, 'ps_at' => now()],
@@ -136,6 +136,7 @@ class PreventionTest extends TestCase
 
     /**
      * @param array<int, Prevention> $preventions
+     * @param array<string, mixed> $memberAttributes
      * @dataProvider attributes
      */
     public function testItRemembersMember(array $memberAttributes, array $preventions): void