diff --git a/app/Member/Membership.php b/app/Member/Membership.php
index 2010b938..0bb0d86d 100644
--- a/app/Member/Membership.php
+++ b/app/Member/Membership.php
@@ -16,7 +16,7 @@ class Membership extends Model
 {
     use HasFactory;
 
-    public $fillable = ['subactivity_id', 'activity_id', 'group_id', 'member_id', 'nami_id', 'from'];
+    public $fillable = ['subactivity_id', 'activity_id', 'group_id', 'member_id', 'nami_id', 'from', 'promised_at'];
 
     public function activity(): BelongsTo
     {
diff --git a/app/Membership/Actions/MembershipStoreAction.php b/app/Membership/Actions/MembershipStoreAction.php
index f48b5273..6919c98f 100644
--- a/app/Membership/Actions/MembershipStoreAction.php
+++ b/app/Membership/Actions/MembershipStoreAction.php
@@ -7,6 +7,7 @@ use App\Member\Member;
 use App\Member\Membership;
 use App\Setting\NamiSettings;
 use App\Subactivity;
+use Carbon\Carbon;
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Validation\Rule;
 use Illuminate\Validation\Rules\In;
@@ -20,7 +21,7 @@ class MembershipStoreAction
 {
     use AsAction;
 
-    public function handle(Member $member, Activity $activity, ?Subactivity $subactivity, NamiSettings $settings): Membership
+    public function handle(Member $member, Activity $activity, ?Subactivity $subactivity, ?Carbon $promisedAt, NamiSettings $settings): Membership
     {
         $from = now()->startOfDay();
 
@@ -38,6 +39,7 @@ class MembershipStoreAction
         $membership = $member->memberships()->create([
             'activity_id' => $activity->id,
             'subactivity_id' => $subactivity ? $subactivity->id : null,
+            'promised_at' => $promisedAt,
             ...['nami_id' => $namiId, 'group_id' => $member->group->id, 'from' => $from],
         ]);
 
@@ -56,6 +58,7 @@ class MembershipStoreAction
         return [
             'activity_id' => ['bail', 'required', 'exists:activities,id'],
             'subactivity_id' => $subactivityRule,
+            'promised_at' => ['nullable', 'date'],
         ];
     }
 
@@ -76,6 +79,7 @@ class MembershipStoreAction
             $member,
             Activity::find($request->activity_id),
             $request->subactivity_id ? Subactivity::find($request->subactivity_id) : null,
+            $request->promised_at ? Carbon::parse($request->promised_at) : null,
             $settings,
         );
 
diff --git a/app/Membership/Actions/MembershipUpdateAction.php b/app/Membership/Actions/MembershipUpdateAction.php
new file mode 100644
index 00000000..72c3ced6
--- /dev/null
+++ b/app/Membership/Actions/MembershipUpdateAction.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace App\Membership\Actions;
+
+use App\Activity;
+use App\Member\Member;
+use App\Member\Membership;
+use App\Subactivity;
+use Carbon\Carbon;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Validation\Rule;
+use Illuminate\Validation\Rules\In;
+use Lorisleiva\Actions\ActionRequest;
+use Lorisleiva\Actions\Concerns\AsAction;
+
+class MembershipUpdateAction
+{
+    use AsAction;
+
+    public function handle(Membership $membership, Activity $activity, ?Subactivity $subactivity, ?Carbon $promisedAt): Membership
+    {
+        $from = now()->startOfDay();
+
+        $membership->update([
+            'activity_id' => $activity->id,
+            'subactivity_id' => $subactivity ? $subactivity->id : null,
+            'promised_at' => $promisedAt,
+        ]);
+
+        return $membership;
+    }
+
+    /**
+     * @return array<string, array<int, string|In>>
+     */
+    public function rules(): array
+    {
+        $subactivityRule = request()->activity_id ? ['nullable', Rule::exists('activity_subactivity', 'subactivity_id')->where('activity_id', request()->activity_id)] : ['nullable'];
+
+        return [
+            'activity_id' => ['bail', 'required', 'exists:activities,id'],
+            'subactivity_id' => $subactivityRule,
+            'promised_at' => ['nullable', 'date'],
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function getValidationAttributes(): array
+    {
+        return [
+            'activity_id' => 'Tätigkeit',
+            'subactivity_id' => 'Untertätigkeit',
+        ];
+    }
+
+    public function asController(Member $member, Membership $membership, ActionRequest $request): RedirectResponse
+    {
+        $this->handle(
+            $membership,
+            Activity::find($request->activity_id),
+            $request->subactivity_id ? Subactivity::find($request->subactivity_id) : null,
+            $request->promised_at ? Carbon::parse($request->promised_at) : null,
+        );
+
+        return redirect()->back();
+    }
+}
diff --git a/app/Membership/MembershipResource.php b/app/Membership/MembershipResource.php
index 2e060900..b0faf1a8 100644
--- a/app/Membership/MembershipResource.php
+++ b/app/Membership/MembershipResource.php
@@ -25,6 +25,7 @@ class MembershipResource extends JsonResource
             'subactivity_id' => $this->subactivity_id,
             'subactivity_name' => $this->subactivity?->name,
             'human_date' => $this->created_at->format('d.m.Y'),
+            'promised_at' => $this->promised_at,
         ];
     }
 }
diff --git a/database/factories/Member/MembershipFactory.php b/database/factories/Member/MembershipFactory.php
index e2c213eb..bb419d38 100644
--- a/database/factories/Member/MembershipFactory.php
+++ b/database/factories/Member/MembershipFactory.php
@@ -6,6 +6,7 @@ use App\Activity;
 use App\Group;
 use App\Member\Membership;
 use App\Subactivity;
+use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Factories\Factory;
 
 /**
@@ -25,6 +26,7 @@ class MembershipFactory extends Factory
         return [
             'group_id' => Group::factory()->createOne()->id,
             'from' => now()->subMonths(3),
+            'promised_at' => null,
         ];
     }
 
@@ -43,4 +45,11 @@ class MembershipFactory extends Factory
 
         return $instance;
     }
+
+    public function promise(Carbon $value): self
+    {
+        return $this->state([
+            'promised_at' => $value->format('Y-m-d'),
+        ]);
+    }
 }
diff --git a/database/migrations/2022_12_11_192600_create_memberships_has_promise_column.php b/database/migrations/2022_12_11_192600_create_memberships_has_promise_column.php
new file mode 100644
index 00000000..d473d80a
--- /dev/null
+++ b/database/migrations/2022_12_11_192600_create_memberships_has_promise_column.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class() extends Migration {
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('memberships', function (Blueprint $table) {
+            $table->date('promised_at')->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+    }
+};
diff --git a/resources/js/views/member/MemberMemberships.vue b/resources/js/views/member/MemberMemberships.vue
index c246b332..9a3adbdc 100644
--- a/resources/js/views/member/MemberMemberships.vue
+++ b/resources/js/views/member/MemberMemberships.vue
@@ -17,6 +17,7 @@
                 :options="activities"
                 v-model="single.activity_id"
                 label="Tätigkeit"
+                size="sm"
                 required
             ></f-select>
             <f-select
@@ -26,7 +27,23 @@
                 id="subactivity_id"
                 v-model="single.subactivity_id"
                 label="Untertätigkeit"
+                size="sm"
             ></f-select>
+            <f-switch
+                id="has_promise"
+                :items="single.promised_at !== null"
+                @input="single.promised_at = $event ? '2000-02-02' : null"
+                size="sm"
+                label="Hat Versprechen"
+            ></f-switch>
+            <f-text
+                v-show="single.promised_at !== null"
+                type="date"
+                id="promised_at"
+                v-model="single.promised_at"
+                label="Versprechensdatum"
+                size="sm"
+            ></f-text>
             <button type="submit" class="btn btn-primary">Absenden</button>
         </form>
 
diff --git a/routes/web.php b/routes/web.php
index 41a67b8b..0d9ef488 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -12,6 +12,7 @@ use App\Member\Controllers\MemberResyncController;
 use App\Member\MemberController;
 use App\Membership\Actions\MembershipDestroyAction;
 use App\Membership\Actions\MembershipStoreAction;
+use App\Membership\Actions\MembershipUpdateAction;
 use App\Payment\AllpaymentController;
 use App\Payment\PaymentController;
 use App\Payment\SendpaymentController;
@@ -36,6 +37,7 @@ Route::group(['middleware' => 'auth:web'], function (): void {
     Route::get('/sendpayment', [SendpaymentController::class, 'create'])->name('sendpayment.create');
     Route::get('/sendpayment/pdf', [SendpaymentController::class, 'send'])->name('sendpayment.pdf');
     Route::post('/member/{member}/membership', MembershipStoreAction::class)->name('membership.store');
+    Route::patch('/member/{member}/membership/{membership}', MembershipUpdateAction::class)->name('membership.store');
     Route::delete('/member/{member}/membership/{membership}', MembershipDestroyAction::class)->name('membership.destroy');
     Route::resource('member.course', CourseController::class);
     Route::get('/member/{member}/efz', ShowEfzDocumentAction::class)->name('efz');
diff --git a/tests/Feature/Member/ShowTest.php b/tests/Feature/Member/ShowTest.php
index b8309fa7..b702f6d6 100644
--- a/tests/Feature/Member/ShowTest.php
+++ b/tests/Feature/Member/ShowTest.php
@@ -33,7 +33,7 @@ class ShowTest extends TestCase
         $this->withoutExceptionHandling()->login()->loginNami();
         $member = Member::factory()
             ->defaults()
-            ->has(Membership::factory()->in('€ LeiterIn', 5, 'Jungpfadfinder', 88)->state(['created_at' => '2022-11-19 05:00:00']))
+            ->has(Membership::factory()->promise(now())->in('€ LeiterIn', 5, 'Jungpfadfinder', 88)->state(['created_at' => '2022-11-19 05:00:00']))
             ->has(Payment::factory()->notPaid()->nr('2019')->subscription('Free', 1050))
             ->for(Gender::factory()->name('Männlich'))
             ->for(Region::factory()->name('NRW'))
@@ -108,6 +108,7 @@ class ShowTest extends TestCase
             'subactivity_name' => 'Jungpfadfinder',
             'id' => $member->memberships->first()->id,
             'human_date' => '19.11.2022',
+            'promised_at' => now()->format('Y-m-d'),
          ], $response, 'data.memberships.0');
         $this->assertInertiaHas([
             'organizer' => 'DPSG',
diff --git a/tests/Feature/Membership/StoreTest.php b/tests/Feature/Membership/StoreTest.php
index 1b07ce9e..a4fa79de 100644
--- a/tests/Feature/Membership/StoreTest.php
+++ b/tests/Feature/Membership/StoreTest.php
@@ -42,7 +42,7 @@ class StoreTest extends TestCase
 
         $response = $this->from('/member')->post(
             "/member/{$member->id}/membership",
-            MembershipRequestFactory::new()->in($activity, $activity->subactivities->first())->create()
+            MembershipRequestFactory::new()->promise(now())->in($activity, $activity->subactivities->first())->create()
         );
 
         $response->assertRedirect('/member');
@@ -52,6 +52,7 @@ class StoreTest extends TestCase
             'activity_id' => $activity->id,
             'subactivity_id' => $activity->subactivities->first()->id,
             'nami_id' => 133,
+            'promised_at' => now()->format('Y-m-d'),
         ]);
         app(MembershipFake::class)->assertCreated(6, [
             'untergliederungId' => 4,
diff --git a/tests/Feature/Membership/UpdateTest.php b/tests/Feature/Membership/UpdateTest.php
new file mode 100644
index 00000000..3ad327e5
--- /dev/null
+++ b/tests/Feature/Membership/UpdateTest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Tests\Feature\Membership;
+
+use App\Activity;
+use App\Group;
+use App\Member\Member;
+use App\Member\Membership;
+use App\Subactivity;
+use Carbon\Carbon;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+use Tests\RequestFactories\MembershipRequestFactory;
+use Tests\TestCase;
+
+class UpdateTest extends TestCase
+{
+    use DatabaseTransactions;
+
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        Carbon::setTestNow(Carbon::parse('2022-02-03 03:00:00'));
+        $this->login()->loginNami();
+    }
+
+    public function testItCreatesAMembership(): void
+    {
+        $this->withoutExceptionHandling();
+        $activity = Activity::factory()->hasAttached(Subactivity::factory())->create();
+        $member = Member::factory()
+            ->defaults()
+            ->has(Membership::factory()->for($activity)->for($activity->subactivities->first()))
+            ->for(Group::factory()->inNami(1400))
+            ->inNami(6)
+            ->create();
+        $membership = $member->memberships->first();
+
+        $response = $this->from('/member')->patch(
+            "/member/{$member->id}/membership/{$membership->id}",
+            MembershipRequestFactory::new()->promise(now())->in($membership->activity, $membership->subactivity)->create()
+        );
+
+        $response->assertRedirect('/member');
+        $this->assertDatabaseHas('memberships', [
+            'member_id' => $member->id,
+            'activity_id' => $activity->id,
+            'subactivity_id' => $activity->subactivities->first()->id,
+            'promised_at' => now()->format('Y-m-d'),
+        ]);
+    }
+}
diff --git a/tests/RequestFactories/MembershipRequestFactory.php b/tests/RequestFactories/MembershipRequestFactory.php
index 6a8051cb..d6183046 100644
--- a/tests/RequestFactories/MembershipRequestFactory.php
+++ b/tests/RequestFactories/MembershipRequestFactory.php
@@ -4,13 +4,16 @@ namespace Tests\RequestFactories;
 
 use App\Activity;
 use App\Subactivity;
+use Carbon\Carbon;
 use Worksome\RequestFactories\RequestFactory;
 
 class MembershipRequestFactory extends RequestFactory
 {
     public function definition(): array
     {
-        return [];
+        return [
+            'has_promise' => null,
+        ];
     }
 
     public function in(Activity $activity, ?Subactivity $subactivity = null): self
@@ -44,4 +47,11 @@ class MembershipRequestFactory extends RequestFactory
             'subactivity_id' => Subactivity::factory()->create()->id,
         ]);
     }
+
+    public function promise(Carbon $value): self
+    {
+        return $this->state([
+            'promised_at' => $value->format('Y-m-d'),
+        ]);
+    }
 }