diff --git a/kpops/utils/dict_differ.py b/kpops/utils/dict_differ.py
index 90315a7d2..ebb9e562f 100644
--- a/kpops/utils/dict_differ.py
+++ b/kpops/utils/dict_differ.py
@@ -1,10 +1,10 @@
 from __future__ import annotations
 
-from collections.abc import Mapping
+from collections.abc import Mapping, MutableMapping
 from dataclasses import dataclass
 from difflib import Differ
 from enum import Enum
-from typing import TYPE_CHECKING, Generic, TypeVar
+from typing import TYPE_CHECKING, Any, Generic, TypeVar
 
 import typer
 import yaml
@@ -79,16 +79,17 @@ def __find_changed_key(key_1: list[str] | str, key_2: str = "") -> str:
         return f"{key_1}.{key_2}"
 
 
-def render_diff(d1: Mapping, d2: Mapping, ignore: set[str] | None = None) -> str | None:
-    d1 = dict(d1)
-    d2 = dict(d2)
-
-    def del_ignored_keys(d: dict) -> None:
+def render_diff(
+    d1: MutableMapping[str, Any],
+    d2: MutableMapping[str, Any],
+    ignore: set[str] | None = None,
+) -> str | None:
+    def del_ignored_keys(d: MutableMapping[str, Any]) -> None:
         """Delete key to be ignored, dictionary is modified in-place."""
         if ignore:
             for i in ignore:
                 key_path = i.split(".")
-                nested = d1
+                nested = d
                 try:
                     for key in key_path[:-1]:
                         nested = nested[key]