diff --git a/pyproject.toml b/pyproject.toml
index cd16022..195529d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -69,7 +69,7 @@ dev-flake8 = [
   "pydoclint == 0.9.1",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 26.5.1", "isort == 8.0.1"]
+dev-formatting = ["black == 26.5.1", "isort == 9.0.1"]
 dev-mkdocs = [
   "black == 26.5.1",
   "Markdown == 3.10.2",
diff --git a/src/frequenz/client/dispatch/_internal_types.py b/src/frequenz/client/dispatch/_internal_types.py
index 6bca982..60ba4c2 100644
--- a/src/frequenz/client/dispatch/_internal_types.py
+++ b/src/frequenz/client/dispatch/_internal_types.py
@@ -11,9 +11,7 @@
 from frequenz.api.dispatch.v1.dispatch_pb2 import (
     CreateMicrogridDispatchRequest as PBDispatchCreateRequest,
 )
-from frequenz.api.dispatch.v1.dispatch_pb2 import (
-    DispatchData,
-)
+from frequenz.api.dispatch.v1.dispatch_pb2 import DispatchData
 from google.protobuf.json_format import MessageToDict
 from google.protobuf.struct_pb2 import Struct
 from google.protobuf.timestamp_pb2 import Timestamp