diff --git a/CHANGELOG.md b/CHANGELOG.md
index b536def07..56fe478d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,10 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
-## [4.1.3] - unreleased
+## [4.1.3] - 2024-03-05
 
-* Fix the timezone of `datetime` fields when they are read from the database by @GromNaN in [#2739](https://github.com/mongodb/laravel-mongodb/pull/2739)
+* Fix the timezone of `datetime` fields when they are read from the database. By @GromNaN in [#2739](https://github.com/mongodb/laravel-mongodb/pull/2739)
+* Fix support for null values in `datetime` and reset `date` fields with custom format to the start of the day. By @GromNaN in [#2741](https://github.com/mongodb/laravel-mongodb/pull/2741)
 
 ## [4.1.2] - 2024-02-22
 
diff --git a/src/Eloquent/Model.php b/src/Eloquent/Model.php
index dbf7579cd..83239c8eb 100644
--- a/src/Eloquent/Model.php
+++ b/src/Eloquent/Model.php
@@ -205,9 +205,10 @@ protected function transformModelValue($key, $value)
         if ($this->hasCast($key) && $value instanceof CarbonInterface) {
             $value->settings(array_merge($value->getSettings(), ['toStringFormat' => $this->getDateFormat()]));
 
+            // "date" cast resets the time to 00:00:00.
             $castType = $this->getCasts()[$key];
-            if ($this->isCustomDateTimeCast($castType) && str_starts_with($castType, 'date:')) {
-                $value->startOfDay();
+            if (str_starts_with($castType, 'date:') || str_starts_with($castType, 'immutable_date:')) {
+                $value = $value->startOfDay();
             }
         }
 
@@ -315,19 +316,6 @@ protected function fromDecimal($value, $decimals)
         return new Decimal128($this->asDecimal($value, $decimals));
     }
 
-    /** @inheritdoc */
-    protected function castAttribute($key, $value)
-    {
-        $castType = $this->getCastType($key);
-
-        return match ($castType) {
-            'immutable_custom_datetime','immutable_datetime' => str_starts_with($this->getCasts()[$key], 'immutable_date:') ?
-                $this->asDate($value)->toImmutable() :
-                $this->asDateTime($value)->toImmutable(),
-            default => parent::castAttribute($key, $value)
-        };
-    }
-
     /** @inheritdoc */
     public function attributesToArray()
     {
diff --git a/tests/Casts/DateTest.php b/tests/Casts/DateTest.php
index 20ce5dd9a..64743bce0 100644
--- a/tests/Casts/DateTest.php
+++ b/tests/Casts/DateTest.php
@@ -52,6 +52,12 @@ public function testDate(): void
         self::assertInstanceOf(Carbon::class, $refetchedModel->dateField);
         self::assertInstanceOf(UTCDateTime::class, $model->getRawOriginal('dateField'));
         self::assertEquals(now()->subDay()->startOfDay()->format('Y-m-d H:i:s'), (string) $refetchedModel->dateField);
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->dateField);
+
+        $model->update(['dateField' => null]);
+        $this->assertNull($model->dateField);
     }
 
     public function testDateAsString(): void
@@ -84,6 +90,12 @@ public function testDateWithCustomFormat(): void
 
         self::assertInstanceOf(Carbon::class, $model->dateWithFormatField);
         self::assertEquals(now()->startOfDay()->subDay()->format('j.n.Y H:i'), (string) $model->dateWithFormatField);
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->dateWithFormatField);
+
+        $model->update(['dateWithFormatField' => null]);
+        $this->assertNull($model->dateWithFormatField);
     }
 
     public function testImmutableDate(): void
@@ -105,6 +117,12 @@ public function testImmutableDate(): void
             Carbon::createFromTimestamp(1698577443)->subDay()->startOfDay()->format('Y-m-d H:i:s'),
             (string) $model->immutableDateField,
         );
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->immutableDateField);
+
+        $model->update(['immutableDateField' => null]);
+        $this->assertNull($model->immutableDateField);
     }
 
     public function testImmutableDateWithCustomFormat(): void
@@ -126,5 +144,11 @@ public function testImmutableDateWithCustomFormat(): void
             Carbon::createFromTimestamp(1698577443)->subDay()->startOfDay()->format('j.n.Y H:i'),
             (string) $model->immutableDateWithFormatField,
         );
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->immutableDateWithFormatField);
+
+        $model->update(['immutableDateWithFormatField' => null]);
+        $this->assertNull($model->immutableDateWithFormatField);
     }
 }
diff --git a/tests/Casts/DatetimeTest.php b/tests/Casts/DatetimeTest.php
index 022ed3535..49f1cd9c6 100644
--- a/tests/Casts/DatetimeTest.php
+++ b/tests/Casts/DatetimeTest.php
@@ -36,6 +36,12 @@ public function testDatetime(): void
         self::assertInstanceOf(Carbon::class, $model->datetimeField);
         self::assertInstanceOf(UTCDateTime::class, $model->getRawOriginal('datetimeField'));
         self::assertEquals(now()->subDay()->format('Y-m-d H:i:s'), (string) $model->datetimeField);
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->datetimeField);
+
+        $model->update(['datetimeField' => null]);
+        $this->assertNull($model->datetimeField);
     }
 
     public function testDatetimeAsString(): void
@@ -70,6 +76,12 @@ public function testDatetimeWithCustomFormat(): void
 
         self::assertInstanceOf(Carbon::class, $model->datetimeWithFormatField);
         self::assertEquals(now()->subDay()->format('j.n.Y H:i'), (string) $model->datetimeWithFormatField);
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->datetimeWithFormatField);
+
+        $model->update(['datetimeWithFormatField' => null]);
+        $this->assertNull($model->datetimeWithFormatField);
     }
 
     public function testImmutableDatetime(): void
@@ -92,6 +104,12 @@ public function testImmutableDatetime(): void
             Carbon::createFromTimestamp(1698577443)->subDay()->format('Y-m-d H:i:s'),
             (string) $model->immutableDatetimeField,
         );
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->immutableDatetimeField);
+
+        $model->update(['immutableDatetimeField' => null]);
+        $this->assertNull($model->immutableDatetimeField);
     }
 
     public function testImmutableDatetimeWithCustomFormat(): void
@@ -113,5 +131,11 @@ public function testImmutableDatetimeWithCustomFormat(): void
             Carbon::createFromTimestamp(1698577443)->subDay()->format('j.n.Y H:i'),
             (string) $model->immutableDatetimeWithFormatField,
         );
+
+        $model = Casting::query()->create();
+        $this->assertNull($model->immutableDatetimeWithFormatField);
+
+        $model->update(['immutableDatetimeWithFormatField' => null]);
+        $this->assertNull($model->immutableDatetimeWithFormatField);
     }
 }