diff --git a/modelskill/comparison/_collection.py b/modelskill/comparison/_collection.py
index f08e6592..a251fce6 100644
--- a/modelskill/comparison/_collection.py
+++ b/modelskill/comparison/_collection.py
@@ -1,4 +1,5 @@
 from __future__ import annotations
+from copy import deepcopy
 import os
 from pathlib import Path
 import tempfile
@@ -253,12 +254,10 @@ def rename(self, mapping: Dict[str, str]) -> "ComparerCollection":
         return ComparerCollection(cmps)
 
     @overload
-    def __getitem__(self, x: slice | Iterable[Hashable]) -> ComparerCollection:
-        ...
+    def __getitem__(self, x: slice | Iterable[Hashable]) -> ComparerCollection: ...
 
     @overload
-    def __getitem__(self, x: int | Hashable) -> Comparer:
-        ...
+    def __getitem__(self, x: int | Hashable) -> Comparer: ...
 
     def __getitem__(
         self, x: int | Hashable | slice | Iterable[Hashable]
@@ -298,15 +297,8 @@ def __len__(self) -> int:
     def __iter__(self) -> Iterator[Comparer]:
         return iter(self._comparers.values())
 
-    def __copy__(self) -> "ComparerCollection":
-        cls = self.__class__
-        cp = cls.__new__(cls)
-        # TODO should this use deepcopy?
-        cp.__init__(list(self._comparers))  # type: ignore
-        return cp
-
     def copy(self) -> "ComparerCollection":
-        return self.__copy__()
+        return deepcopy(self)
 
     def __add__(
         self, other: Union["Comparer", "ComparerCollection"]
diff --git a/tests/test_comparercollection.py b/tests/test_comparercollection.py
index 544d06a3..dec0b8b3 100644
--- a/tests/test_comparercollection.py
+++ b/tests/test_comparercollection.py
@@ -569,3 +569,13 @@ def test_peak_ratio_2(cc_pr):
     sk = cc_pr.skill(metrics=["peak_ratio"])
     assert "peak_ratio" in sk.data.columns
     assert sk.to_dataframe()["peak_ratio"].values == pytest.approx(1.0799999095653732)
+
+
+def test_copy(cc):
+    cc2 = cc.copy()
+    assert cc2.n_models == 3
+    assert cc2.n_points == 10
+    assert cc2.start_time == pd.Timestamp("2019-01-01")
+    assert cc2.end_time == pd.Timestamp("2019-01-07")
+    assert cc2.obs_names == ["fake point obs", "fake track obs"]
+    assert cc2.mod_names == ["m1", "m2", "m3"]