diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a14062e..124b16b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -64,7 +64,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: "22"
       - name: Listener and engine parse
diff --git a/tests/test_workflow_pins.py b/tests/test_workflow_pins.py
new file mode 100644
index 0000000..55d3f9d
--- /dev/null
+++ b/tests/test_workflow_pins.py
@@ -0,0 +1,21 @@
+from pathlib import Path
+import re
+import unittest
+
+
+class WorkflowPinTests(unittest.TestCase):
+    def test_setup_node_is_immutable_and_node24_compatible(self):
+        workflow_path = Path(__file__).parents[1] / ".github" / "workflows" / "ci.yml"
+        if not workflow_path.exists():
+            self.skipTest("repository workflow is not part of the packaged artifact")
+        workflow = workflow_path.read_text(encoding="utf-8")
+        matches = re.findall(r"actions/setup-node@([^\s#]+)", workflow)
+        self.assertEqual(matches, ["820762786026740c76f36085b0efc47a31fe5020"])
+        self.assertIn(
+            "actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0",
+            workflow,
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()