diff --git a/pyproject.toml b/pyproject.toml
index d348b45..2932f04 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
 ]
 
-dependencies = ["grpcio==1.*", "grpcio-reflection==1.*", "protobuf==5.27.2", "structlog==24.*"]
+dependencies = ["grpcio==1.*", "grpcio-reflection==1.*", "protobuf==5.28.0", "structlog==24.*"]
 
 dynamic = ["version"]