diff --git a/pyproject.toml b/pyproject.toml
index 97db661..f9cb557 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,7 +79,7 @@ dev-mypy = [
   "mypy == 2.3.1",
   "grpc-stubs == 1.53.0.6",
   "types-Markdown == 3.10.2.20260712",
-  "types-protobuf == 7.35.1.20260827",
+  "types-protobuf == 7.35.1.20260906",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-client-microgrid[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]