diff --git a/src/Illuminate/Collections/Traits/EnumeratesValues.php b/src/Illuminate/Collections/Traits/EnumeratesValues.php
index fec550211710..bf636c7ca790 100644
--- a/src/Illuminate/Collections/Traits/EnumeratesValues.php
+++ b/src/Illuminate/Collections/Traits/EnumeratesValues.php
@@ -311,7 +311,7 @@ public function every($key, $operator = null, $value = null)
     /**
      * Get the first item by the given key value pair.
      *
-     * @param  string  $key
+     * @param  callable|string  $key
      * @param  mixed  $operator
      * @param  mixed  $value
      * @return TValue|null
@@ -548,7 +548,7 @@ public function unlessNotEmpty(callable $callback, callable $default = null)
     /**
      * Filter items by the given key value pair.
      *
-     * @param  string  $key
+     * @param  callable|string  $key
      * @param  mixed  $operator
      * @param  mixed  $value
      * @return static
@@ -995,13 +995,17 @@ protected function getArrayableItems($items)
     /**
      * Get an operator checker callback.
      *
-     * @param  string  $key
+     * @param  callable|string  $key
      * @param  string|null  $operator
      * @param  mixed  $value
      * @return \Closure
      */
     protected function operatorForWhere($key, $operator = null, $value = null)
     {
+        if (is_callable($key)) {
+            return $key;
+        }
+
         if (func_num_args() === 1) {
             $value = true;
 
diff --git a/tests/Support/SupportCollectionTest.php b/tests/Support/SupportCollectionTest.php
index f8263ed78010..1c49205f8fa5 100755
--- a/tests/Support/SupportCollectionTest.php
+++ b/tests/Support/SupportCollectionTest.php
@@ -276,6 +276,11 @@ public function testFirstWhere($collection)
         $this->assertSame('gasket', $data->firstWhere('material', 'rubber')['type']);
         $this->assertNull($data->firstWhere('material', 'nonexistent'));
         $this->assertNull($data->firstWhere('nonexistent', 'key'));
+
+        $this->assertSame('book', $data->firstWhere(fn ($value) => $value['material'] === 'paper')['type']);
+        $this->assertSame('gasket', $data->firstWhere(fn ($value) => $value['material'] === 'rubber')['type']);
+        $this->assertNull($data->firstWhere(fn ($value) => $value['material'] === 'nonexistent'));
+        $this->assertNull($data->firstWhere(fn ($value) => ($value['nonexistent'] ?? null) === 'key'));
     }
 
     /**
@@ -1000,6 +1005,16 @@ public function testWhere($collection)
             $c->where('v', '>', $object)->values()->all()
         );
 
+        $this->assertEquals(
+            [['v' => 3], ['v' => '3']],
+            $c->where(fn ($value) => $value['v'] == 3)->values()->all()
+        );
+
+        $this->assertEquals(
+            [['v' => 3]],
+            $c->where(fn ($value) => $value['v'] === 3)->values()->all()
+        );
+
         $c = new $collection([['v' => 1], ['v' => $object]]);
         $this->assertEquals(
             [['v' => $object]],