diff --git a/core/apps/finance/serializers/cash_transaction.py b/core/apps/finance/serializers/cash_transaction.py
index 8f2b20d..cde8aca 100644
--- a/core/apps/finance/serializers/cash_transaction.py
+++ b/core/apps/finance/serializers/cash_transaction.py
@@ -50,9 +50,12 @@ class CashTransactionUpdateSerializer(serializers.ModelSerializer):
 
     def update(self, instance, validated_data):
         instance.name = validated_data.get('name', instance.name)
-        instance.payment_type = validated_data.get('payment_type', instance.payment_type)
         instance.status = validated_data.get('status', instance.status)
-        instance.folder = validated_data.get('folder', instance.folder)  # `folter` o‘rniga `folder`
+        instance.folder = validated_data.get('folder', instance.folder)
+
+        payment_types = validated_data.get('payment_type', None)
+        if payment_types is not None:
+            instance.payment_type.set(payment_types) 
         
         employees = validated_data.get('employees', None)
         if employees is not None: