diff --git a/pyproject.toml b/pyproject.toml
index 781b2c8..aab8aeb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ authors = []
 requires-python = ">= 3.9"
 dependencies = [
     "grpcio~=1.54.2",
-    "protobuf~=4.23.2",
+    "protobuf~=5.28.2",
 ]
 
 [build-system]