diff --git a/test_requirements.txt b/test_requirements.txt
index 4699e43e43..7076cd81a5 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -4,7 +4,7 @@ wheel==0.36.2
 pytest==6.2.2
 pytest-cov==2.11.1
 pytest-xdist==2.2.1
-pytest-mock==1.11.2
+pytest-mock==3.5.1
 pytest-lazy-fixture==0.6.3
 pytest-timeout==1.4.2
 pytest-docker==0.10.1
diff --git a/tests/unit/test_external_repo.py b/tests/unit/test_external_repo.py
index a26125b083..8fc66621b3 100644
--- a/tests/unit/test_external_repo.py
+++ b/tests/unit/test_external_repo.py
@@ -68,7 +68,7 @@ def test_subrepo_is_constructed_properly(
 
         list(repo.repo_fs.walk(repo.root_dir))  # drain
         assert spy.call_count == 1
-        subrepo = spy.return_value
+        subrepo = spy.spy_return
 
         assert repo.url == str(tmp_dir)
         assert repo.config["cache"]["dir"] == str(cache_dir)