diff --git a/app/app/Services/Project/ProjectService.php b/app/app/Services/Project/ProjectService.php
index 24317d58..9c2c2d56 100644
--- a/app/app/Services/Project/ProjectService.php
+++ b/app/app/Services/Project/ProjectService.php
@@ -41,6 +41,18 @@ class ProjectService
             || array_key_exists('daily_limit_target', $data)
             || array_key_exists('delivery_days_mask', $data);
 
+        if (array_key_exists('signal_identifier', $data) || array_key_exists('sms_senders', $data) || array_key_exists('sms_keyword', $data)) {
+            $this->assertSourceUnique($project->tenant_id, array_merge([
+                'signal_type' => $project->signal_type,
+                'signal_identifier' => $project->signal_identifier,
+                'sms_senders' => $project->sms_senders,
+                'sms_keyword' => $project->sms_keyword,
+            ], $data), exceptId: $project->id);
+        }
+        if (array_key_exists('name', $data)) {
+            $this->assertNameUnique($project->tenant_id, (string) $data['name'], exceptId: $project->id);
+        }
+
         $project->update($data);
 
         if ($needsResync) {
diff --git a/app/tests/Feature/Project/ProjectCreateDedupTest.php b/app/tests/Feature/Project/ProjectCreateDedupTest.php
index 909dbfe9..93a0e8d6 100644
--- a/app/tests/Feature/Project/ProjectCreateDedupTest.php
+++ b/app/tests/Feature/Project/ProjectCreateDedupTest.php
@@ -6,8 +6,10 @@ use App\Models\Project;
 use App\Models\Tenant;
 use App\Services\Project\ProjectService;
 use Illuminate\Http\Exceptions\HttpResponseException;
+use Illuminate\Support\Facades\Queue;
 
 beforeEach(function () {
+    Queue::fake();
     $this->tenant = Tenant::factory()->create(['balance_leads' => 100]);
 });
 
diff --git a/app/tests/Feature/Project/ProjectUpdateDedupTest.php b/app/tests/Feature/Project/ProjectUpdateDedupTest.php
new file mode 100644
index 00000000..017b252a
--- /dev/null
+++ b/app/tests/Feature/Project/ProjectUpdateDedupTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\Tenant;
+use App\Services\Project\ProjectService;
+use Illuminate\Http\Exceptions\HttpResponseException;
+use Illuminate\Support\Facades\Queue;
+
+beforeEach(fn () => Queue::fake());
+
+it('blocks update that collides source with another project of same tenant', function () {
+    $tenant = Tenant::factory()->create(['balance_leads' => 100]);
+    $svc = app(ProjectService::class);
+    $a = $svc->create($tenant, ['name' => 'A', 'signal_type' => 'call', 'signal_identifier' => '79991110000', 'daily_limit_target' => 5, 'regions' => [], 'delivery_days_mask' => 31]);
+    $b = $svc->create($tenant, ['name' => 'B', 'signal_type' => 'call', 'signal_identifier' => '79992220000', 'daily_limit_target' => 5, 'regions' => [], 'delivery_days_mask' => 31]);
+
+    expect(fn () => $svc->update($b, ['signal_identifier' => '79991110000']))
+        ->toThrow(HttpResponseException::class);
+});
+
+it('allows update keeping same source on the same project', function () {
+    $tenant = Tenant::factory()->create(['balance_leads' => 100]);
+    $svc = app(ProjectService::class);
+    $a = $svc->create($tenant, ['name' => 'A', 'signal_type' => 'call', 'signal_identifier' => '79991110000', 'daily_limit_target' => 5, 'regions' => [], 'delivery_days_mask' => 31]);
+    $updated = $svc->update($a, ['signal_identifier' => '79991110000', 'daily_limit_target' => 7]);
+    expect($updated->daily_limit_target)->toBe(7);
+});