diff --git a/app/Models/Course.php b/app/Models/Course.php
index dad1f4d..0f9bd8b 100644
--- a/app/Models/Course.php
+++ b/app/Models/Course.php
@@ -61,8 +61,20 @@ class Course extends Model implements HasMedia
     {
         $this->addMediaCollection('logo')
             ->singleFile()
+            ->acceptsMimeTypes([
+                'image/jpeg',
+                'image/png',
+                'image/gif',
+                'image/webp',
+            ])
             ->useFallbackUrl(asset('img/einundzwanzig.png'));
         $this->addMediaCollection('images')
+            ->acceptsMimeTypes([
+                'image/jpeg',
+                'image/png',
+                'image/gif',
+                'image/webp',
+            ])
             ->useFallbackUrl(asset('img/einundzwanzig.png'));
     }
 
diff --git a/app/Models/Lecturer.php b/app/Models/Lecturer.php
index 1fe276e..d94e905 100644
--- a/app/Models/Lecturer.php
+++ b/app/Models/Lecturer.php
@@ -63,8 +63,20 @@ class Lecturer extends Model implements HasMedia
     {
         $this->addMediaCollection('avatar')
             ->singleFile()
+            ->acceptsMimeTypes([
+                'image/jpeg',
+                'image/png',
+                'image/gif',
+                'image/webp',
+            ])
             ->useFallbackUrl(asset('img/einundzwanzig.png'));
         $this->addMediaCollection('images')
+            ->acceptsMimeTypes([
+                'image/jpeg',
+                'image/png',
+                'image/gif',
+                'image/webp',
+            ])
             ->useFallbackUrl(asset('img/einundzwanzig.png'));
     }
 
diff --git a/app/Models/Meetup.php b/app/Models/Meetup.php
index ed27de2..e97c82a 100644
--- a/app/Models/Meetup.php
+++ b/app/Models/Meetup.php
@@ -73,6 +73,12 @@ class Meetup extends Model implements HasMedia
     {
         $this->addMediaCollection('logo')
             ->singleFile()
+            ->acceptsMimeTypes([
+                'image/jpeg',
+                'image/png',
+                'image/gif',
+                'image/webp',
+            ])
             ->useFallbackUrl(asset('img/einundzwanzig.png'));
     }
 
diff --git a/app/Models/ProjectProposal.php b/app/Models/ProjectProposal.php
index 4c11e95..72d0862 100644
--- a/app/Models/ProjectProposal.php
+++ b/app/Models/ProjectProposal.php
@@ -67,6 +67,12 @@ class ProjectProposal extends Model implements HasMedia
         $this
             ->addMediaCollection('main')
             ->singleFile()
+            ->acceptsMimeTypes([
+                'image/jpeg',
+                'image/png',
+                'image/gif',
+                'image/webp',
+            ])
             ->useFallbackUrl(asset('einundzwanzig-alpha.jpg'));
     }
 
diff --git a/app/Models/Venue.php b/app/Models/Venue.php
index 46bd81f..43bc146 100644
--- a/app/Models/Venue.php
+++ b/app/Models/Venue.php
@@ -63,6 +63,12 @@ class Venue extends Model implements HasMedia
     public function registerMediaCollections(): void
     {
         $this->addMediaCollection('images')
+            ->acceptsMimeTypes([
+                'image/jpeg',
+                'image/png',
+                'image/gif',
+                'image/webp',
+            ])
             ->useFallbackUrl(asset('img/einundzwanzig.png'));
     }
 
diff --git a/resources/views/livewire/association/project-support/form/create.blade.php b/resources/views/livewire/association/project-support/form/create.blade.php
index 6f6290c..c30512c 100644
--- a/resources/views/livewire/association/project-support/form/create.blade.php
+++ b/resources/views/livewire/association/project-support/form/create.blade.php
@@ -60,7 +60,7 @@ class extends Component
             'form.description' => 'required|string',
             'form.support_in_sats' => 'required|integer|min:0',
             'form.website' => 'required|url|max:255',
-            'file' => 'nullable|file|mimes:jpeg,png,jpg,gif,webp|max:10240',
+            'file' => 'nullable|file|mimes:jpeg,png,jpg,gif,webp|mimetypes:image/jpeg,image/png,image/gif,image/webp|max:10240',
         ]);
 
         $projectProposal = ProjectProposal::query()->create([
diff --git a/resources/views/livewire/association/project-support/form/edit.blade.php b/resources/views/livewire/association/project-support/form/edit.blade.php
index bed98d1..9d6ad01 100644
--- a/resources/views/livewire/association/project-support/form/edit.blade.php
+++ b/resources/views/livewire/association/project-support/form/edit.blade.php
@@ -85,7 +85,7 @@ class extends Component
             'form.description' => 'required|string',
             'form.support_in_sats' => 'required|integer|min:0',
             'form.website' => 'required|url|max:255',
-            'file' => 'nullable|file|mimes:jpeg,png,jpg,gif,webp|max:10240',
+            'file' => 'nullable|file|mimes:jpeg,png,jpg,gif,webp|mimetypes:image/jpeg,image/png,image/gif,image/webp|max:10240',
         ]);
 
         $this->project->update([