diff --git a/MODULE.bazel b/MODULE.bazel
index 565d57a91..a676906cc 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -33,7 +33,7 @@ bazel_dep(
 )
 bazel_dep(
     name = "protobuf",
-    version = "27.0",
+    version = "28.3",
     repo_name = "com_google_protobuf",
 )
 bazel_dep(
diff --git a/eval/tests/BUILD b/eval/tests/BUILD
index 0f9997bb2..c98c02206 100644
--- a/eval/tests/BUILD
+++ b/eval/tests/BUILD
@@ -2,6 +2,9 @@
 #
 #
 
+load("@com_google_protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
+load("@com_google_protobuf//bazel:proto_library.bzl", "proto_library")
+
 package(default_visibility = ["//visibility:public"])
 
 licenses(["notice"])
diff --git a/eval/testutil/BUILD b/eval/testutil/BUILD
index 5d80af860..cb35e6752 100644
--- a/eval/testutil/BUILD
+++ b/eval/testutil/BUILD
@@ -1,3 +1,6 @@
+load("@com_google_protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
+load("@com_google_protobuf//bazel:proto_library.bzl", "proto_library")
+
 # This package contains testing utility code
 package(default_visibility = ["//visibility:public"])