diff --git a/build.sbt b/build.sbt
index f2bca63..ee79576 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,7 +10,7 @@ lazy val ScalaVersions = new {
 }
 
 lazy val Versions = new {
-  val gpb3Version = "3.25.5"
+  val gpb3Version = "4.28.3"
   val grpcVersion = "1.68.1"
   val circeVersion = "0.14.10"
   val http4sVersion = "0.22.2"