diff --git a/io_scene_niftools/modules/nif_import/geometry/vertex/__init__.py b/io_scene_niftools/modules/nif_import/geometry/vertex/__init__.py
index d3c4ee0c6..2ceca42d8 100644
--- a/io_scene_niftools/modules/nif_import/geometry/vertex/__init__.py
+++ b/io_scene_niftools/modules/nif_import/geometry/vertex/__init__.py
@@ -78,7 +78,9 @@ def map_normals(b_mesh, normals):
             # the normals need to be pre-normalized or blender will do it inconsistely, leading to marked sharp edges
             no_array = Vertex.normalize(no_array)
             # use normals_split_custom_set_from_vertices to set the loop custom normals from the per-vertex normals
-            b_mesh.use_auto_smooth = True
+            if bpy.app.version < (4,0,0):
+                b_mesh.use_auto_smooth = True
+            
             b_mesh.normals_split_custom_set_from_vertices(no_array)
 
     @staticmethod
diff --git a/io_scene_niftools/modules/nif_import/property/nodes_wrapper/__init__.py b/io_scene_niftools/modules/nif_import/property/nodes_wrapper/__init__.py
index de7daa682..e983b04b8 100644
--- a/io_scene_niftools/modules/nif_import/property/nodes_wrapper/__init__.py
+++ b/io_scene_niftools/modules/nif_import/property/nodes_wrapper/__init__.py
@@ -299,10 +299,16 @@ def link_normal_node(self, b_texture_node):
             node_group = bpy.data.node_groups.new(group_name, "ShaderNodeTree")
             group_nodes = node_group.nodes
             # add the in/output nodes
-            input_node = group_nodes.new('NodeGroupInput')
-            node_group.inputs.new('NodeSocketColor', "Input")
-            output_node = group_nodes.new('NodeGroupOutput')
-            node_group.outputs.new('NodeSocketColor', "Output")
+            if bpy.app.version < (4,0,0):
+                input_node = group_nodes.new('NodeGroupInput')
+                node_group.inputs.new('NodeSocketColor', "Input")
+                output_node = group_nodes.new('NodeGroupOutput')
+                node_group.outputs.new('NodeSocketColor', "Output")
+            else:
+                input_node = group_nodes.new('NodeGroupInput')
+                node_group.interface.new_socket(name='NodeSocketColor', in_out="INPUT")
+                output_node = group_nodes.new('NodeGroupOutput')
+                node_group.interface.new_socket(name='NodeSocketColor', in_out="OUTPUT")
             # create the converting nodes
             separate_node = group_nodes.new("ShaderNodeSeparateRGB")
             invert_node = group_nodes.new("ShaderNodeInvert")