diff --git a/src/devx/tools/setup.py b/src/devx/tools/setup.py
index f960522..60fc7f4 100644
--- a/src/devx/tools/setup.py
+++ b/src/devx/tools/setup.py
@@ -62,7 +62,7 @@ def _install_ansible_collections(bin_dir: str) -> None:
     if not requirements.exists():
         click.echo("  ansible/requirements.yml not found — skipping collections.")
         return
-    _run([galaxy, "collection", "install", "-r", str(requirements)])
+    _run([galaxy, "collection", "install", "-r", str(requirements), "--no-cache"])
 
 
 def _configure_tea_login() -> None:
diff --git a/tests/unit/test_setup.py b/tests/unit/test_setup.py
index 08383d3..ce2a69b 100644
--- a/tests/unit/test_setup.py
+++ b/tests/unit/test_setup.py
@@ -108,6 +108,8 @@ class TestInstallAnsibleCollections:
             mock_path.return_value.__str__ = lambda _: str(req)
             _install_ansible_collections(".venv/bin")
         mock_run.assert_called_once()
+        args = mock_run.call_args[0][0]
+        assert "--no-cache" in args, "ansible-galaxy must use --no-cache to avoid concurrent cache corruption"
 
     @patch("devx.tools.setup._run")
     def test_skips_when_no_requirements(self, mock_run: MagicMock) -> None: