diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ae7410..afb8291 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@
 
 ## Version 2
 
+### Version 2.2.6
+
+* [186](https://github.com/mlebreuil/netbox-contract/issues/186) Code compatibility fix for Netbox 4.1
+
 ### Version 2.2.5
 
 * Generally improve filtering options
diff --git a/pyproject.toml b/pyproject.toml
index 107a6b5..1fc0233 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "netbox-contract"
-version = "2.2.5"
+version = "2.2.6"
 authors = [
   { name="Marc Lebreuil", email="marc@famillelebreuil.net" },
 ]
diff --git a/src/netbox_contract/__init__.py b/src/netbox_contract/__init__.py
index 11568ca..f269a0f 100644
--- a/src/netbox_contract/__init__.py
+++ b/src/netbox_contract/__init__.py
@@ -5,7 +5,7 @@ class ContractsConfig(PluginConfig):
     name = 'netbox_contract'
     verbose_name = 'Netbox contract'
     description = 'Contract management plugin for Netbox'
-    version = '2.2.5'
+    version = '2.2.6'
     author = 'Marc Lebreuil'
     author_email = 'marc@famillelebreuil.net'
     base_url = 'contracts'
diff --git a/src/netbox_contract/api/serializers.py b/src/netbox_contract/api/serializers.py
index 961f963..3799b17 100644
--- a/src/netbox_contract/api/serializers.py
+++ b/src/netbox_contract/api/serializers.py
@@ -3,9 +3,8 @@
 from drf_yasg.utils import swagger_serializer_method
 from netbox.api.fields import ContentTypeField, SerializedPKRelatedField
 from netbox.api.serializers import NetBoxModelSerializer, WritableNestedSerializer
-from netbox.constants import NESTED_SERIALIZER_PREFIX
 from rest_framework import serializers
-from tenancy.api.nested_serializers import NestedTenantSerializer
+from tenancy.api.serializers_.tenants import TenantSerializer
 from utilities.api import get_serializer_for_model
 
 from ..models import (
@@ -18,22 +17,12 @@
 )
 
 
-class NestedServiceProviderSerializer(WritableNestedSerializer):
-    url = serializers.HyperlinkedIdentityField(
-        view_name='plugins-api:netbox_contract-api:serviceprovider-detail'
-    )
-
-    class Meta:
-        model = ServiceProvider
-        fields = ('id', 'url', 'display', 'name')
-
-
 class NestedContractSerializer(WritableNestedSerializer):
     url = serializers.HyperlinkedIdentityField(
         view_name='plugins-api:netbox_contract-api:contract-detail'
     )
     yrc = serializers.DecimalField(max_digits=10, decimal_places=2, read_only=True)
-    tenant = NestedTenantSerializer(many=False, required=False)
+    tenant = TenantSerializer(nested=True, required=False, allow_null=True)
     external_partie_object_type = ContentTypeField(queryset=ContentType.objects.all())
     external_partie_object = serializers.SerializerMethodField(read_only=True)
 
@@ -67,11 +56,12 @@ class Meta:
     @swagger_serializer_method(serializer_or_field=serializers.JSONField)
     def get_external_partie_object(self, instance):
         serializer = get_serializer_for_model(
-            instance.external_partie_object_type.model_class(),
-            prefix=NESTED_SERIALIZER_PREFIX,
+            instance.external_partie_object_type.model_class()
         )
         context = {'request': self.context['request']}
-        return serializer(instance.external_partie_object, context=context).data
+        return serializer(
+            instance.external_partie_object, nested=True, context=context
+        ).data
 
 
 class NestedInvoiceSerializer(WritableNestedSerializer):
@@ -85,35 +75,6 @@ class Meta:
         brief_fields = ('id', 'url', 'display', 'number')
 
 
-class NestedContractAssignmentSerializer(WritableNestedSerializer):
-    url = serializers.HyperlinkedIdentityField(
-        view_name='plugins-api:netbox_contract-api:contractassignment-detail'
-    )
-
-    class Meta:
-        model = ContractAssignment
-        fields = ('id', 'url', 'display', 'contract', 'content_object')
-        brief_fields = ('id', 'url', 'display', 'contract', 'content_object')
-
-
-class NestedInvoicelineSerializer(WritableNestedSerializer):
-    url = serializers.HyperlinkedIdentityField(
-        view_name='plugins-api:netbox_contract-api:invoiceline-detail'
-    )
-
-    class Meta:
-        model = InvoiceLine
-        fields = ('id', 'url', 'display', 'invoice', 'accounting_dimensions', 'amount')
-        brief_fields = (
-            'id',
-            'url',
-            'display',
-            'invoice',
-            'accounting_dimensions',
-            'amount',
-        )
-
-
 class NestedAccountingDimensionSerializer(WritableNestedSerializer):
     url = serializers.HyperlinkedIdentityField(
         view_name='plugins-api:netbox_contract-api:accountingdimension-detail'
@@ -131,7 +92,7 @@ class ContractSerializer(NetBoxModelSerializer):
     )
     yrc = serializers.DecimalField(max_digits=10, decimal_places=2, read_only=True)
     parent = NestedContractSerializer(many=False, required=False)
-    tenant = NestedTenantSerializer(many=False, required=False)
+    tenant = TenantSerializer(nested=True, required=False, allow_null=True)
     external_partie_object_type = ContentTypeField(queryset=ContentType.objects.all())
     external_partie_object = serializers.SerializerMethodField(read_only=True)
 
@@ -195,11 +156,12 @@ class Meta:
     @swagger_serializer_method(serializer_or_field=serializers.JSONField)
     def get_external_partie_object(self, instance):
         serializer = get_serializer_for_model(
-            instance.external_partie_object_type.model_class(),
-            prefix=NESTED_SERIALIZER_PREFIX,
+            instance.external_partie_object_type.model_class()
         )
         context = {'request': self.context['request']}
-        return serializer(instance.external_partie_object, context=context).data
+        return serializer(
+            instance.external_partie_object, nested=True, context=context
+        ).data
 
 
 class InvoiceSerializer(NetBoxModelSerializer):
@@ -363,11 +325,9 @@ class Meta:
 
     @swagger_serializer_method(serializer_or_field=serializers.JSONField)
     def get_content_object(self, instance):
-        serializer = get_serializer_for_model(
-            instance.content_type.model_class(), prefix=NESTED_SERIALIZER_PREFIX
-        )
+        serializer = get_serializer_for_model(instance.content_type.model_class())
         context = {'request': self.context['request']}
-        return serializer(instance.content_object, context=context).data
+        return serializer(instance.content_object, nested=True, context=context).data
 
 
 class InvoiceLineSerializer(NetBoxModelSerializer):