diff --git a/app/Http/Controllers/BucketController.php b/app/Http/Controllers/BucketController.php
index e52b7b1..bcd13c2 100644
--- a/app/Http/Controllers/BucketController.php
+++ b/app/Http/Controllers/BucketController.php
@@ -75,10 +75,10 @@ public function update(Request $request, Bucket $bucket): JsonResponse
             'name' => 'sometimes|required|string|max:255',
             'type' => 'sometimes|required|in:'.implode(',', BucketTypeEnum::values()),
             'allocation_type' => 'sometimes|required|in:'.implode(',', BucketAllocationTypeEnum::values()),
-            'allocation_value' => 'nullable|numeric',
+            'allocation_value' => 'sometimes|nullable|numeric',
             'buffer_multiplier' => 'sometimes|numeric|min:0',
             'starting_amount' => 'sometimes|integer|min:0',
-            'priority' => 'nullable|integer|min:1',
+            'priority' => 'sometimes|nullable|integer|min:1',
         ]);
 
         $type = isset($validated['type']) ? BucketTypeEnum::from($validated['type']) : $bucket->type;
diff --git a/tests/Feature/BucketUpdateTest.php b/tests/Feature/BucketUpdateTest.php
index 22da158..6b3f2d5 100644
--- a/tests/Feature/BucketUpdateTest.php
+++ b/tests/Feature/BucketUpdateTest.php
@@ -166,4 +166,24 @@ public function test_can_update_name_only(): void
             'name' => 'New Name',
         ]);
     }
+
+    public function test_partial_update_does_not_null_other_fields(): void
+    {
+        $bucket = Bucket::factory()->need()->fixedLimit(1000)->create([
+            'scenario_id' => $this->scenario->id,
+            'starting_amount' => 500,
+            'buffer_multiplier' => 1.5,
+            'priority' => 1,
+        ]);
+
+        $response = $this->patchJson("/buckets/{$bucket->uuid}", [
+            'starting_amount' => 750,
+        ]);
+
+        $response->assertOk();
+        $bucket->refresh();
+        $this->assertEquals(750, $bucket->starting_amount);
+        $this->assertEquals(1000, (float) $bucket->allocation_value);
+        $this->assertEquals(1.5, (float) $bucket->buffer_multiplier);
+    }
 }