diff --git a/MODULE.bazel b/MODULE.bazel
index 769c2ff5..5587a33f 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -39,7 +39,7 @@ local_path_override(
     path = "modules/c",
 )
 
-bazel_dep(name = "protobuf", version = "27.1")
+bazel_dep(name = "protobuf", version = "28.3")
 
 # C++
 bazel_dep(name = "rules_proto_grpc_cpp", version = "0.0.0.rpg.version.placeholder")
diff --git a/modules/c/MODULE.bazel b/modules/c/MODULE.bazel
index 25fcc7e9..371ea0a5 100644
--- a/modules/c/MODULE.bazel
+++ b/modules/c/MODULE.bazel
@@ -4,6 +4,6 @@ module(
     compatibility_level = 1,
 )
 
-bazel_dep(name = "protobuf", version = "27.1")
+bazel_dep(name = "protobuf", version = "28.3")
 bazel_dep(name = "rules_cc", version = "0.0.10")
 bazel_dep(name = "rules_proto_grpc", version = "0.0.0.rpg.version.placeholder")
diff --git a/modules/cpp/MODULE.bazel b/modules/cpp/MODULE.bazel
index aaca9cf1..61a9f4b7 100644
--- a/modules/cpp/MODULE.bazel
+++ b/modules/cpp/MODULE.bazel
@@ -5,6 +5,6 @@ module(
 )
 
 bazel_dep(name = "grpc", version = "1.65.0")
-bazel_dep(name = "protobuf", version = "27.1")
+bazel_dep(name = "protobuf", version = "28.3")
 bazel_dep(name = "rules_cc", version = "0.0.10")
 bazel_dep(name = "rules_proto_grpc", version = "0.0.0.rpg.version.placeholder")
diff --git a/modules/example_protos/MODULE.bazel b/modules/example_protos/MODULE.bazel
index ee653d26..5de83980 100644
--- a/modules/example_protos/MODULE.bazel
+++ b/modules/example_protos/MODULE.bazel
@@ -4,5 +4,5 @@ module(
     compatibility_level = 1,
 )
 
-bazel_dep(name = "protobuf", version = "27.1")
+bazel_dep(name = "protobuf", version = "28.3")
 bazel_dep(name = "rules_proto", version = "6.0.2")
diff --git a/modules/objc/MODULE.bazel b/modules/objc/MODULE.bazel
index 485ace04..40db2e6f 100644
--- a/modules/objc/MODULE.bazel
+++ b/modules/objc/MODULE.bazel
@@ -6,6 +6,6 @@ module(
 
 bazel_dep(name = "apple_support", version = "1.17.0")
 bazel_dep(name = "grpc", version = "1.65.0")
-bazel_dep(name = "protobuf", version = "27.1")
+bazel_dep(name = "protobuf", version = "28.3")
 bazel_dep(name = "rules_cc", version = "0.0.10")
 bazel_dep(name = "rules_proto_grpc", version = "0.0.0.rpg.version.placeholder")
diff --git a/test_workspaces/common_cpp_library/MODULE.bazel b/test_workspaces/common_cpp_library/MODULE.bazel
index 46cbfcd5..4defd6a9 100644
--- a/test_workspaces/common_cpp_library/MODULE.bazel
+++ b/test_workspaces/common_cpp_library/MODULE.bazel
@@ -1,4 +1,4 @@
-bazel_dep(name = "protobuf", version = "27.1")
+bazel_dep(name = "protobuf", version = "28.3")
 bazel_dep(name = "rules_cc", version = "0.0.10")
 bazel_dep(name = "rules_proto", version = "6.0.2")
 bazel_dep(name = "rules_proto_grpc_cpp", version = "0.0.0.rpg.version.placeholder")
diff --git a/test_workspaces/exclusions/MODULE.bazel b/test_workspaces/exclusions/MODULE.bazel
index 7b849c66..27fc56de 100644
--- a/test_workspaces/exclusions/MODULE.bazel
+++ b/test_workspaces/exclusions/MODULE.bazel
@@ -1,4 +1,4 @@
-bazel_dep(name = "protobuf", version = "27.1")
+bazel_dep(name = "protobuf", version = "28.3")
 bazel_dep(name = "rules_proto", version = "6.0.2")
 bazel_dep(name = "rules_proto_grpc_python", version = "0.0.0.rpg.version.placeholder")
 bazel_dep(name = "rules_python", version = "0.34.0")