diff --git a/tests/conftest.py b/tests/conftest.py
index 5267a2e..2b6f692 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -11,7 +11,7 @@ def clone_curl():
     git_url = 'https://github.com/curl/curl.git'
     repo_dir = './test_repos/curl'
     repo = Repo.clone_from(url=git_url, to_path=repo_dir)
-    repo.checkout('curl-7_67_0')
+    repo.heads['curl-7_67_0'].checkout()
 
     def teardown():
         os.unlink(repo_dir)