diff --git a/mergify_cli/ci/scopes/cli.py b/mergify_cli/ci/scopes/cli.py
index 70b325c9..c29ac870 100644
--- a/mergify_cli/ci/scopes/cli.py
+++ b/mergify_cli/ci/scopes/cli.py
@@ -48,7 +48,6 @@ class SourceManual(pydantic.BaseModel):
 class ScopesConfig(pydantic.BaseModel):
     model_config = pydantic.ConfigDict(extra="forbid")
 
-    mode: typing.Literal["serial", "parallel"] = "serial"
     source: SourceFiles | SourceManual | None = None
     merge_queue_scope: str | None = "merge-queue"
 
diff --git a/mergify_cli/tests/ci/scopes/test_cli.py b/mergify_cli/tests/ci/scopes/test_cli.py
index 8decc758..38fad453 100644
--- a/mergify_cli/tests/ci/scopes/test_cli.py
+++ b/mergify_cli/tests/ci/scopes/test_cli.py
@@ -35,7 +35,6 @@ def test_from_yaml_with_extras_ignored(tmp_path: pathlib.Path) -> None:
     config = cli.Config.from_yaml(str(config_file))
     assert config.model_dump() == {
         "scopes": {
-            "mode": "serial",
             "source": {
                 "files": {
                     "backend": {
@@ -76,7 +75,6 @@ def test_from_yaml_valid(tmp_path: pathlib.Path) -> None:
     assert config.model_dump() == {
         "scopes": {
             "merge_queue_scope": "merge-queue",
-            "mode": "serial",
             "source": {
                 "files": {
                     "backend": {