diff --git a/pyproject.toml b/pyproject.toml
index e5a84c9e..cdb807de 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -75,7 +75,7 @@ dev-mypy = [
   "mypy == 1.13.0",
   "grpc-stubs == 1.53.0.5",
   "types-Markdown == 3.7.0.20240822",
-  "types-protobuf == 4.21.0.7",
+  "types-protobuf == 5.28.3.20241030",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-client-microgrid[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]