diff --git a/copier/main.py b/copier/main.py
index 46650e647..40be276c5 100644
--- a/copier/main.py
+++ b/copier/main.py
@@ -6,11 +6,12 @@
 import sys
 from contextlib import suppress
 from dataclasses import asdict, field, replace
+from distutils.dir_util import copy_tree
 from functools import partial
 from itertools import chain
 from pathlib import Path
-from shutil import copyfile, copytree, rmtree
-from typing import Callable, Iterable, List, Mapping, Optional, Sequence
+from shutil import copyfile, rmtree
+from typing import Callable, Iterable, List, Mapping, Optional, Sequence, Set
 from unicodedata import normalize
 
 import pathspec
@@ -40,9 +41,23 @@
 # HACK https://github.com/python/mypy/issues/8520#issuecomment-772081075
 if sys.version_info >= (3, 8):
     from functools import cached_property
+
 else:
     from backports.cached_property import cached_property
 
+# Backport of `shutil.copytree` for python 3.7 to accept `dirs_exist_ok` argument
+if sys.version_info <= (3, 8):
+    from shutil import copytree
+else:
+    from distutils.dir_util import copy_tree
+
+    def copytree(src: Path, dst: Path, dirs_exist_ok: bool = False):
+        """Backport of `shutil.copytree` with `dirs_exist_ok` argument.
+
+        Can be remove once python 3.7 dropped.
+        """
+        copy_tree(str(src), str(dst))
+
 
 @dataclass
 class Worker:
@@ -694,7 +709,7 @@ def run_update(self) -> None:
             self.run_copy()
 
             # Extract the list of files to merge
-            participating_files: set[Path] = set()
+            participating_files: Set[Path] = set()
             for src_dir in (original_dst_temp, reference_dst_temp):
                 for root, dirs, files in os.walk(src_dir, topdown=True):
                     if root == src_dir and ".git" in dirs:
diff --git a/docs/updating.md b/docs/updating.md
index 7df9b14c6..a48ebedc4 100644
--- a/docs/updating.md
+++ b/docs/updating.md
@@ -30,9 +30,9 @@ equivalent) hook that detects them, just like this:
 ```yaml title=".pre-commit-config.yaml"
 repos:
     - repo: https://github.com/pre-commit/pre-commit-hooks
-        rev: v4.0.1
-        hooks:
-        - id: check-merge-conflict
+      rev: v4.0.1
+      hooks:
+          - id: check-merge-conflict
             args: [--assume-in-merge]
 ```
 
diff --git a/tests/test_updatediff.py b/tests/test_updatediff.py
index e1e8edfde..bc2544274 100644
--- a/tests/test_updatediff.py
+++ b/tests/test_updatediff.py
@@ -220,6 +220,7 @@ def test_updatediff(tmp_path_factory):
                 _src_path: {bundle}
                 author_name: Guybrush
                 project_name: to become a pirate\n
+                >>>>>>> new upstream
             """
         )
         assert readme.read_text() == dedent(