diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b32eb9554..7bbde78b86 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,7 +28,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 ### Fixed
 
 - minimal requirements issue ([#1147](https://github.com/catalyst-team/catalyst/issues/1147))
-
+- nested dicts in `loaders_params`/`samplers_params` overriding fixed ([#1150](https://github.com/catalyst-team/catalyst/pull/1150))
 
 ## [21.03.1] - 2021-03-28
 
diff --git a/catalyst/utils/data.py b/catalyst/utils/data.py
index 6bc4cb1387..450921b74c 100644
--- a/catalyst/utils/data.py
+++ b/catalyst/utils/data.py
@@ -1,5 +1,6 @@
 from typing import Any, Callable, Dict, Iterable
 from collections import OrderedDict
+import copy
 from functools import partial
 
 import torch
@@ -120,11 +121,11 @@ def get_loaders_from_params(
 
     default_batch_size = batch_size
     default_num_workers = num_workers
-    loaders_params = loaders_params or {}
+    loaders_params = copy.deepcopy(loaders_params) or {}
     assert isinstance(loaders_params, dict), (
         f"`loaders_params` should be a Dict. " f"Got: {loaders_params}"
     )
-    samplers_params = samplers_params or {}
+    samplers_params = copy.deepcopy(samplers_params) or {}
     assert isinstance(
         samplers_params, dict
     ), f"`samplers_params` should be a Dict. Got: {samplers_params}"