diff --git a/build.sbt b/build.sbt
index 956cf2106a..950ee35ee0 100644
--- a/build.sbt
+++ b/build.sbt
@@ -330,7 +330,7 @@ lazy val sbtZioHttpGrpc = (project in file("sbt-zio-http-grpc"))
     libraryDependencies ++= Seq(
       "com.thesamet.scalapb" %% "compilerplugin"  % "0.11.15",
       "com.thesamet.scalapb" %% "scalapb-runtime" % "0.11.15" % "protobuf",
-      "com.google.protobuf"   % "protobuf-java"   % "4.26.1"  % "protobuf",
+      "com.google.protobuf"   % "protobuf-java"   % "4.28.0"  % "protobuf",
     ),
   )
   .settings(
@@ -354,7 +354,7 @@ lazy val sbtZioHttpGrpcTests = (project in file("sbt-zio-http-grpc-tests"))
     libraryDependencies ++= Seq(
       `zio-test-sbt`,
       `zio-test`,
-      "com.google.protobuf"   % "protobuf-java"   % "4.26.1"  % "protobuf",
+      "com.google.protobuf"   % "protobuf-java"   % "4.28.0"  % "protobuf",
       "com.thesamet.scalapb" %% "scalapb-runtime" % "0.11.15" % "protobuf",
     ),
     Compile / run / fork := true,