diff --git a/tests/unit/test_infra_artifact.py b/tests/unit/test_infra_artifact.py
index 7c5483d..6b6ee85 100644
--- a/tests/unit/test_infra_artifact.py
+++ b/tests/unit/test_infra_artifact.py
@@ -134,6 +134,16 @@ class TestVersionInputs(unittest.TestCase):
             after = ia.infra_artifact_version("init", repo_root=root)
         self.assertNotEqual(before, after)
 
+    def test_pyproject_toml_change_bumps_version(self) -> None:
+        with tempfile.TemporaryDirectory() as d:
+            root = Path(d)
+            self._fake_repo(root)
+            before = ia.infra_artifact_version("init", repo_root=root)
+            (root / "pyproject.toml").write_text(
+                "[project]\nname = 'bot-bottle'\ndependencies = ['httpx']\n")
+            after = ia.infra_artifact_version("init", repo_root=root)
+        self.assertNotEqual(before, after)
+
     def test_pyc_and_pycache_ignored(self) -> None:
         with tempfile.TemporaryDirectory() as d:
             root = Path(d)