diff --git a/zetta_utils/layer/layer_set/backend.py b/zetta_utils/layer/layer_set/backend.py
index be04524ba..bf3a6dd7f 100644
--- a/zetta_utils/layer/layer_set/backend.py
+++ b/zetta_utils/layer/layer_set/backend.py
@@ -29,4 +29,4 @@ def name(self) -> str:
         return f"LayerSet[f{'_'.join(self.layers.keys())}]"
 
     def with_changes(self, **kwargs) -> LayerSetBackend[IndexT, DataT]:
-        return attrs.evolve(self, **kwargs)
+        return attrs.evolve(self, **kwargs)  # pragma: no cover
diff --git a/zetta_utils/layer/volumetric/backend.py b/zetta_utils/layer/volumetric/backend.py
index 8af3a1556..8e995487a 100644
--- a/zetta_utils/layer/volumetric/backend.py
+++ b/zetta_utils/layer/volumetric/backend.py
@@ -82,7 +82,7 @@ def get_chunk_aligned_index(
     """
 
     def with_changes(self, **kwargs) -> VolumetricBackend[DataT]:
-        return attrs.evolve(self, **kwargs)
+        return attrs.evolve(self, **kwargs)  # pragma: no cover
 
     @abstractmethod
     def assert_idx_is_chunk_aligned(self, idx: VolumetricIndex) -> None:
diff --git a/zetta_utils/layer/volumetric/layer.py b/zetta_utils/layer/volumetric/layer.py
index 430fd8f0a..4cfc5a563 100644
--- a/zetta_utils/layer/volumetric/layer.py
+++ b/zetta_utils/layer/volumetric/layer.py
@@ -43,4 +43,4 @@ def with_changes(
         self,
         **kwargs,
     ):
-        return attrs.evolve(self, **kwargs)
+        return attrs.evolve(self, **kwargs)  # pragma: no cover