diff --git a/pyproject_metadata/constants.py b/pyproject_metadata/constants.py
index afa1185..f8fa773 100644
--- a/pyproject_metadata/constants.py
+++ b/pyproject_metadata/constants.py
@@ -48,7 +48,7 @@ def __dir__() -> list[str]:
     "version": frozenset(["Version"]),
 }
 
-KNOWN_TOPLEVEL_FIELDS = {"build-system", "project", "tool"}
+KNOWN_TOPLEVEL_FIELDS = {"build-system", "project", "tool", "dependency-groups"}
 KNOWN_BUILD_SYSTEM_FIELDS = {"backend-path", "build-backend", "requires"}
 KNOWN_PROJECT_FIELDS = set(PROJECT_TO_METADATA)
 
diff --git a/tests/test_standard_metadata.py b/tests/test_standard_metadata.py
index 0c21cdd..2650598 100644
--- a/tests/test_standard_metadata.py
+++ b/tests/test_standard_metadata.py
@@ -1479,9 +1479,7 @@ def test_missing_keys_okay() -> None:
 
 def test_extra_top_level() -> None:
     assert not pyproject_metadata.extras_top_level(
-        {
-            "project": {},
-        }
+        {"project": {}, "dependency-groups": {}}
     )
     assert {"also-not-real", "not-real"} == pyproject_metadata.extras_top_level(
         {