diff --git a/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/BackendServer.scala b/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/BackendServer.scala
index ab288d60..30b0e727 100644
--- a/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/BackendServer.scala
+++ b/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/BackendServer.scala
@@ -7,7 +7,7 @@ import zio.interop.catz._
 import zio.telemetry.opentelemetry.Tracing
 import zio.telemetry.opentelemetry.example.config.{ Config, Configuration }
 import zio.telemetry.opentelemetry.example.http.{ AppEnv, AppTask, Client, StatusService }
-import zio.{ Managed, ZIO, ZLayer }
+import zio.{ ExitCode, Managed, ZIO, ZLayer }
 import org.http4s.syntax.kleisli._
 import sttp.client.asynchttpclient.zio.AsyncHttpClientZioBackend
 
@@ -34,5 +34,6 @@ object BackendServer extends zio.App {
   val tracer      = Configuration.live >>> JaegerTracer.live("zio-backend")
   val envLayer    = tracer ++ Clock.live >>> Tracing.live ++ Configuration.live ++ client
 
-  override def run(args: List[String]) = server.provideCustomLayer(envLayer).fold(_ => 1, _ => 0)
+  override def run(args: List[String]) =
+    server.provideCustomLayer(envLayer).fold(_ => ExitCode.failure, _ => ExitCode.success)
 }
diff --git a/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/ProxyServer.scala b/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/ProxyServer.scala
index 24d66408..09c96cfb 100644
--- a/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/ProxyServer.scala
+++ b/opentelemetry-example/src/main/scala/zio/telemetry/opentelemetry/example/ProxyServer.scala
@@ -7,7 +7,7 @@ import zio.interop.catz._
 import zio.telemetry.opentelemetry.Tracing
 import zio.telemetry.opentelemetry.example.config.{ Config, Configuration }
 import zio.telemetry.opentelemetry.example.http.{ AppEnv, AppTask, Client, StatusesService }
-import zio.{ Managed, ZIO, ZLayer }
+import zio.{ ExitCode, Managed, ZIO, ZLayer }
 import org.http4s.syntax.kleisli._
 import sttp.client.asynchttpclient.zio.AsyncHttpClientZioBackend
 
@@ -35,5 +35,6 @@ object ProxyServer extends zio.App {
   val tracer      = Configuration.live >>> JaegerTracer.live("zio-proxy")
   val envLayer    = tracer ++ Clock.live >>> Tracing.live ++ Configuration.live ++ client
 
-  override def run(args: List[String]) = server.provideCustomLayer(envLayer).fold(_ => 1, _ => 0)
+  override def run(args: List[String]) =
+    server.provideCustomLayer(envLayer).fold(_ => ExitCode.failure, _ => ExitCode.success)
 }
diff --git a/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/BackendServer.scala b/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/BackendServer.scala
index 4d1d754e..6c08bd32 100644
--- a/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/BackendServer.scala
+++ b/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/BackendServer.scala
@@ -1,6 +1,6 @@
 package zio.telemetry.opentracing.example
 
-import cats.effect.ExitCode
+import cats.effect.{ ExitCode => catsExitCode }
 import org.http4s.server.Router
 import org.http4s.server.blaze.BlazeServerBuilder
 import org.http4s.syntax.kleisli._
@@ -8,11 +8,11 @@ import zio.interop.catz._
 import zio.telemetry.opentracing.example.JaegerTracer.makeService
 import zio.telemetry.opentracing.example.config.Configuration
 import zio.telemetry.opentracing.example.http.{ AppTask, StatusService }
-import zio.{ ZEnv, ZIO }
+import zio.{ ExitCode, ZEnv, ZIO }
 
 object BackendServer extends CatsApp {
 
-  override def run(args: List[String]): ZIO[ZEnv, Nothing, Int] =
+  override def run(args: List[String]): ZIO[ZEnv, Nothing, ExitCode] =
     (for {
       conf    <- Configuration.load.provideLayer(Configuration.live)
       service = makeService(conf.tracer.host, "zio-backend")
@@ -21,8 +21,8 @@ object BackendServer extends CatsApp {
                  .bindHttp(conf.backend.port, conf.backend.host)
                  .withHttpApp(router)
                  .serve
-                 .compile[AppTask, AppTask, ExitCode]
+                 .compile[AppTask, AppTask, catsExitCode]
                  .drain
-                 .as(0)
-    } yield result).orElse(ZIO.succeed(1))
+                 .as(ExitCode.success)
+    } yield result).orElse(ZIO.succeed(ExitCode.failure))
 }
diff --git a/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/ProxyServer.scala b/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/ProxyServer.scala
index 35c2d500..f9eb5413 100644
--- a/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/ProxyServer.scala
+++ b/opentracing-example/src/main/scala/zio/telemetry/opentracing/example/ProxyServer.scala
@@ -1,6 +1,6 @@
 package zio.telemetry.opentracing.example
 
-import cats.effect.ExitCode
+import cats.effect.{ ExitCode => catsExitCode }
 import org.http4s.server.Router
 import org.http4s.server.blaze.BlazeServerBuilder
 import org.http4s.syntax.kleisli._
@@ -9,11 +9,11 @@ import zio.interop.catz._
 import zio.telemetry.opentracing.example.JaegerTracer.makeService
 import zio.telemetry.opentracing.example.config.Configuration
 import zio.telemetry.opentracing.example.http.{ AppTask, StatusesService }
-import zio.{ ZEnv, ZIO }
+import zio.{ ExitCode, ZEnv, ZIO }
 
 object ProxyServer extends CatsApp {
 
-  override def run(args: List[String]): ZIO[ZEnv, Nothing, Int] =
+  override def run(args: List[String]): ZIO[ZEnv, Nothing, ExitCode] =
     (for {
       conf       <- Configuration.load.provideLayer(Configuration.live)
       service    = makeService(conf.tracer.host, "zio-proxy")
@@ -23,9 +23,9 @@ object ProxyServer extends CatsApp {
                  .bindHttp(conf.proxy.port, conf.proxy.host)
                  .withHttpApp(router)
                  .serve
-                 .compile[AppTask, AppTask, ExitCode]
+                 .compile[AppTask, AppTask, catsExitCode]
                  .drain
-                 .as(0)
-    } yield result) orElse ZIO.succeed(1)
+                 .as(ExitCode.success)
+    } yield result) orElse ZIO.succeed(ExitCode.failure)
 
 }
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index f42fc7a7..3e5bdf25 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -9,7 +9,7 @@ object Dependencies {
     val opentelemetry = "0.3.0"
     val opencensus    = "0.26.0"
     val zipkin        = "2.15.0"
-    val zio           = "1.0.0-RC19-2"
+    val zio           = "1.0.0-RC20"
   }
 
   lazy val zio = Seq(