diff --git a/e2e/src/test/resources/service_config.json b/e2e/src/test/resources/service_config.json
deleted file mode 100644
index 00e3a3c2a..000000000
--- a/e2e/src/test/resources/service_config.json
+++ /dev/null
@@ -1,22 +0,0 @@
-{
-  "methodConfig": [
-    {
-      "name": [
-        {
-          "service": "scalapb.zio_grpc.TestService",
-          "method": "Unary"
-        }
-      ],
-
-      "retryPolicy": {
-        "maxAttempts": 5,
-        "initialBackoff": "0.1s",
-        "maxBackoff": "30s",
-        "backoffMultiplier": 1,
-        "retryableStatusCodes": [
-          "UNAVAILABLE"
-        ]
-      }
-    }
-  ]
-}
\ No newline at end of file
diff --git a/e2e/src/test/scalajvm/scalapb/zio_grpc/TestServiceSpec.scala b/e2e/src/test/scalajvm/scalapb/zio_grpc/TestServiceSpec.scala
index c8532073a..a7f221ea2 100644
--- a/e2e/src/test/scalajvm/scalapb/zio_grpc/TestServiceSpec.scala
+++ b/e2e/src/test/scalajvm/scalapb/zio_grpc/TestServiceSpec.scala
@@ -1,8 +1,7 @@
 package scalapb.zio_grpc
 
-import com.google.gson.Gson
-import com.google.gson.stream.JsonReader
 import io.grpc.{ManagedChannelBuilder, ServerBuilder, Status, StatusException}
+import scala.jdk.CollectionConverters._
 import scalapb.zio_grpc.server.TestServiceImpl
 import scalapb.zio_grpc.testservice.Request.Scenario
 import scalapb.zio_grpc.testservice.ZioTestservice.TestServiceClient
@@ -18,20 +17,26 @@ object TestServiceSpec extends ZIOSpecDefault with CommonTestServiceSpec {
   val serverLayer: ZLayer[TestServiceImpl, Throwable, Server] =
     ServerLayer.fromEnvironment[TestServiceImpl.Service](ServerBuilder.forPort(0))
 
+  // https://github.com/grpc/proposal/blob/master/A6-client-retries.md
+  val serviceConfig = Map(
+    "methodConfig" -> Map(
+      "name"        -> List(Map("service" -> "scalapb.zio_grpc.TestService", "method" -> "Unary").asJava).asJava,
+      "retryPolicy" -> Map[String, Any](
+        "maxAttempts"          -> 5,
+        "initialBackoff"       -> "0.1s",
+        "maxBackoff"           -> "30s",
+        "backoffMultiplier"    -> 1,
+        "retryableStatusCodes" -> List("UNAVAILABLE").asJava
+      ).asJava
+    ).asJava
+  ).asJava
+
   val clientLayer: ZLayer[Server, Nothing, TestServiceClient] =
     ZLayer.scoped[Server] {
       for {
         ss     <- ZIO.service[Server]
         port   <- ss.port.orDie
-        ch      = ManagedChannelBuilder
-                    .forAddress("localhost", port)
-                    .defaultServiceConfig(
-                      new Gson().fromJson(
-                        new JsonReader(scala.io.Source.fromResource("service_config.json").reader()),
-                        classOf[java.util.Map[String, Any]]
-                      )
-                    )
-                    .usePlaintext()
+        ch      = ManagedChannelBuilder.forAddress("localhost", port).defaultServiceConfig(serviceConfig).usePlaintext()
         client <- TestServiceClient.scoped(ZManagedChannel(ch)).orDie
       } yield client
     }
@@ -60,11 +65,9 @@ object TestServiceSpec extends ZIOSpecDefault with CommonTestServiceSpec {
         } yield assert(r)(fails(hasStatusCode(Status.DEADLINE_EXCEEDED))) && assert(exit.get.isInterrupted)(isTrue)
       } @@ flaky(100) @@ withLiveClock,
       test("let clients retry") {
-        assertZIO(
-          TestServiceClient
-            .unary(Request(Request.Scenario.UNAVAILABLE, in = 12))
-            .exit
-        )(fails(hasStatusCode(Status.UNAVAILABLE) && hasDescription("5")))
+        assertZIO(TestServiceClient.unary(Request(Request.Scenario.UNAVAILABLE, in = 12)).exit) {
+          fails(hasStatusCode(Status.UNAVAILABLE) && hasDescription("5"))
+        }
       }
     )