diff --git a/http/src/main/scala/client/HttpClient.scala b/http/src/main/scala/client/HttpClient.scala
index 2e7379f..05de319 100644
--- a/http/src/main/scala/client/HttpClient.scala
+++ b/http/src/main/scala/client/HttpClient.scala
@@ -51,7 +51,7 @@ class HttpClient[F[_]: Effect](c: Client[F], host: String, port: Int) {
 
     val request: Request[F] = Request[F](Method.POST, baseUri)
 
-    val req = request.withBody(newPerson.asJson)
+    val req = request.withEntity(newPerson.asJson)
 
     c.expect(req)
 
diff --git a/http/src/main/scala/server/HttpServer.scala b/http/src/main/scala/server/HttpServer.scala
index c65c73b..27473b7 100644
--- a/http/src/main/scala/server/HttpServer.scala
+++ b/http/src/main/scala/server/HttpServer.scala
@@ -14,6 +14,7 @@ import org.http4s.dsl.io._
 import org.http4s.server.blaze._
 
 import scala.concurrent.ExecutionContext.Implicits.global
+import org.http4s.server.blaze.BlazeServerBuilder
 
 object HttpServer extends StreamApp[IO] {
 
@@ -23,7 +24,7 @@ object HttpServer extends StreamApp[IO] {
   ): fs2.Stream[IO, StreamApp.ExitCode] =
     for {
       b <-
-        BlazeBuilder[IO]
+        BlazeServerBuilder[IO]
           .bindHttp(HttpConf.port, HttpConf.host)
           .mountService(httpServices, "/")
           .serve
@@ -32,7 +33,7 @@ object HttpServer extends StreamApp[IO] {
       )
     } yield b
 
-  val httpServices = HttpService[IO] {
+  val httpServices = HttpRoutes.of[IO] {
 
     case GET -> Root / "person"                => Ok(listPersons)
     case GET -> Root / "person" / id           => Ok(getPerson(PersonId(id)))
diff --git a/project/ProjectPlugin.scala b/project/ProjectPlugin.scala
index 5a330c0..f4e311c 100644
--- a/project/ProjectPlugin.scala
+++ b/project/ProjectPlugin.scala
@@ -13,7 +13,7 @@ object ProjectPlugin extends AutoPlugin {
 
     lazy val V = new {
       lazy val freesRPC = "0.15.1"
-      lazy val http4s   = "0.18.26"
+      lazy val http4s   = "0.21.19"
       lazy val config   = "1.4.1"
       lazy val logback  = "1.2.3"
       lazy val circe    = "0.13.0"