diff --git a/tests/installation/test_chef.py b/tests/installation/test_chef.py
index 9a7e63c75c9..6e84905ed90 100644
--- a/tests/installation/test_chef.py
+++ b/tests/installation/test_chef.py
@@ -50,6 +50,7 @@ def setup(mocker: MockerFixture, pool: RepositoryPool) -> None:
     mocker.patch.object(Factory, "create_pool", return_value=pool)
 
 
+@pytest.mark.network
 def test_isolated_env_install_success(pool: RepositoryPool) -> None:
     with ephemeral_environment(Path(sys.executable)) as venv:
         env = IsolatedEnv(venv, pool)
diff --git a/tests/installation/test_executor.py b/tests/installation/test_executor.py
index dfc1adc2a4d..eb704ae5ac1 100644
--- a/tests/installation/test_executor.py
+++ b/tests/installation/test_executor.py
@@ -710,6 +710,7 @@ def test_executor_should_write_pep610_url_references_for_wheel_files(
     assert url.exists(), "source file should not be deleted"
 
 
+@pytest.mark.network
 def test_executor_should_write_pep610_url_references_for_non_wheel_files(
     tmp_venv: VirtualEnv,
     pool: RepositoryPool,