diff --git a/bundle-monix-http4s-blaze/src/main/scala/com/avast/sst/bundle/MonixServerApp.scala b/bundle-monix-http4s-blaze/src/main/scala/com/avast/sst/bundle/MonixServerApp.scala
index 5189db87c..bf13cb6d8 100644
--- a/bundle-monix-http4s-blaze/src/main/scala/com/avast/sst/bundle/MonixServerApp.scala
+++ b/bundle-monix-http4s-blaze/src/main/scala/com/avast/sst/bundle/MonixServerApp.scala
@@ -14,7 +14,7 @@ trait MonixServerApp extends TaskApp {
 
   private val logger = LoggerFactory.getLogger(this.getClass)
 
-  def program: Resource[Task, Server[Task]]
+  def program: Resource[Task, Server]
 
   override def run(args: List[String]): Task[ExitCode] = {
     program
diff --git a/bundle-zio-http4s-blaze/src/main/scala/com/avast/sst/bundle/ZioServerApp.scala b/bundle-zio-http4s-blaze/src/main/scala/com/avast/sst/bundle/ZioServerApp.scala
index 84ba4b976..e60d45fd7 100644
--- a/bundle-zio-http4s-blaze/src/main/scala/com/avast/sst/bundle/ZioServerApp.scala
+++ b/bundle-zio-http4s-blaze/src/main/scala/com/avast/sst/bundle/ZioServerApp.scala
@@ -17,7 +17,7 @@ trait ZioServerApp extends CatsApp {
 
   private val logger = LoggerFactory.getLogger(this.getClass)
 
-  def program: Resource[Task, Server[Task]]
+  def program: Resource[Task, Server]
 
   @nowarn("msg=dead code")
   override def run(args: List[String]): ZIO[ZEnv, Nothing, ExitCode] = {
diff --git a/example/src/main/scala/com/avast/sst/example/Main.scala b/example/src/main/scala/com/avast/sst/example/Main.scala
index b51c6ae26..99e9e7c41 100644
--- a/example/src/main/scala/com/avast/sst/example/Main.scala
+++ b/example/src/main/scala/com/avast/sst/example/Main.scala
@@ -30,7 +30,7 @@ import scala.concurrent.ExecutionContext
 
 object Main extends ZioServerApp {
 
-  def program: Resource[Task, Server[Task]] = {
+  def program: Resource[Task, Server] = {
     for {
       configuration <- Resource.eval(PureConfigModule.makeOrRaise[Task, Configuration])
       executorModule <- ExecutorModule.makeFromExecutionContext[Task](runtime.platform.executor.asEC)
diff --git a/http4s-client-blaze-pureconfig/src/main/scala/com/avast/sst/http4s/client/pureconfig/ConfigReaders.scala b/http4s-client-blaze-pureconfig/src/main/scala/com/avast/sst/http4s/client/pureconfig/ConfigReaders.scala
index 5a6b68a3b..08f897487 100644
--- a/http4s-client-blaze-pureconfig/src/main/scala/com/avast/sst/http4s/client/pureconfig/ConfigReaders.scala
+++ b/http4s-client-blaze-pureconfig/src/main/scala/com/avast/sst/http4s/client/pureconfig/ConfigReaders.scala
@@ -2,7 +2,7 @@ package com.avast.sst.http4s.client.pureconfig
 
 import cats.syntax.either._
 import com.avast.sst.http4s.client.Http4sBlazeClientConfig
-import org.http4s.client.blaze.ParserMode
+import org.http4s.blaze.client.ParserMode
 import org.http4s.headers.`User-Agent`
 import pureconfig.ConfigReader
 import pureconfig.error.CannotConvert
diff --git a/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientConfig.scala b/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientConfig.scala
index 9ab3b0885..c7b3702a9 100644
--- a/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientConfig.scala
+++ b/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientConfig.scala
@@ -1,9 +1,9 @@
 package com.avast.sst.http4s.client
 
-import org.http4s.BuildInfo
-import org.http4s.client.blaze.ParserMode
+import org.http4s.blaze.client.ParserMode
 import org.http4s.client.defaults
-import org.http4s.headers.{AgentComment, AgentProduct, `User-Agent`}
+import org.http4s.headers.`User-Agent`
+import org.http4s.{BuildInfo, ProductComment, ProductId}
 
 import java.util.concurrent.TimeUnit
 import scala.concurrent.duration.{Duration, FiniteDuration}
@@ -13,7 +13,7 @@ final case class Http4sBlazeClientConfig(
     idleTimeout: FiniteDuration = Duration(1, TimeUnit.MINUTES),
     requestTimeout: FiniteDuration = defaults.RequestTimeout,
     connectTimeout: FiniteDuration = defaults.ConnectTimeout,
-    userAgent: `User-Agent` = `User-Agent`(AgentProduct("http4s-blaze-client", Some(BuildInfo.version)), List(AgentComment("Server"))),
+    userAgent: `User-Agent` = `User-Agent`(ProductId("http4s-blaze-client", Some(BuildInfo.version)), List(ProductComment("Server"))),
     maxTotalConnections: Int = 10,
     maxWaitQueueLimit: Int = 256,
     maxConnectionsPerRequestkey: Int = 256,
diff --git a/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientModule.scala b/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientModule.scala
index 868967f80..9f4fb61c2 100644
--- a/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientModule.scala
+++ b/http4s-client-blaze/src/main/scala/com/avast/sst/http4s/client/Http4sBlazeClientModule.scala
@@ -1,8 +1,8 @@
 package com.avast.sst.http4s.client
 
 import cats.effect.{ConcurrentEffect, Resource}
+import org.http4s.blaze.client.BlazeClientBuilder
 import org.http4s.client.Client
-import org.http4s.client.blaze.BlazeClientBuilder
 
 import javax.net.ssl.SSLContext
 import scala.concurrent.ExecutionContext
diff --git a/http4s-client-blaze/src/test/scala/com/avast/sst/http4s/client/Http4SBlazeClientTest.scala b/http4s-client-blaze/src/test/scala/com/avast/sst/http4s/client/Http4SBlazeClientTest.scala
index a9006581e..593e55c01 100644
--- a/http4s-client-blaze/src/test/scala/com/avast/sst/http4s/client/Http4SBlazeClientTest.scala
+++ b/http4s-client-blaze/src/test/scala/com/avast/sst/http4s/client/Http4SBlazeClientTest.scala
@@ -2,6 +2,7 @@ package com.avast.sst.http4s.client
 
 import cats.effect._
 import org.http4s.headers._
+import org.http4s.{ProductComment, ProductId}
 import org.scalatest.funsuite.AsyncFunSuite
 
 import scala.concurrent.ExecutionContext
@@ -19,7 +20,7 @@ class Http4SBlazeClientTest extends AsyncFunSuite {
     val test = for {
       client <- Http4sBlazeClientModule.make[IO](
         Http4sBlazeClientConfig(
-          userAgent = `User-Agent`(AgentProduct("http4s-client", Some("1.2.3")), List(AgentComment("Test")))
+          userAgent = `User-Agent`(ProductId("http4s-client", Some("1.2.3")), List(ProductComment("Test")))
         ),
         ExecutionContext.global
       )
diff --git a/http4s-server-blaze/src/main/scala/com/avast/sst/http4s/server/Http4sBlazeServerModule.scala b/http4s-server-blaze/src/main/scala/com/avast/sst/http4s/server/Http4sBlazeServerModule.scala
index 90a2b2221..a09c85e2d 100644
--- a/http4s-server-blaze/src/main/scala/com/avast/sst/http4s/server/Http4sBlazeServerModule.scala
+++ b/http4s-server-blaze/src/main/scala/com/avast/sst/http4s/server/Http4sBlazeServerModule.scala
@@ -2,8 +2,8 @@ package com.avast.sst.http4s.server
 
 import cats.effect.{ConcurrentEffect, Resource, Timer}
 import org.http4s.HttpApp
+import org.http4s.blaze.server.BlazeServerBuilder
 import org.http4s.server.Server
-import org.http4s.server.blaze.BlazeServerBuilder
 
 import java.net.{InetSocketAddress, StandardSocketOptions}
 import scala.concurrent.ExecutionContext
@@ -19,7 +19,7 @@ object Http4sBlazeServerModule {
       config: Http4sBlazeServerConfig,
       httpApp: HttpApp[F],
       executionContext: ExecutionContext
-  ): Resource[F, Server[F]] = {
+  ): Resource[F, Server] = {
     for {
       inetSocketAddress <- Resource.eval(
         ConcurrentEffect[F].delay(
diff --git a/http4s-server/src/main/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddleware.scala b/http4s-server/src/main/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddleware.scala
index 1d9001a5a..63372b51c 100644
--- a/http4s-server/src/main/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddleware.scala
+++ b/http4s-server/src/main/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddleware.scala
@@ -1,13 +1,13 @@
 package com.avast.sst.http4s.server.middleware
 
-import cats.data.{Kleisli, OptionT}
+import cats.data.{Kleisli, NonEmptyList, OptionT}
 import cats.effect.Sync
 import cats.syntax.functor._
 import com.avast.sst.http4s.server.middleware.CorrelationIdMiddleware.CorrelationId
-import io.chrisdavenport.vault.Key
-import org.http4s.util.CaseInsensitiveString
 import org.http4s.{Header, HttpRoutes, Request, Response}
 import org.slf4j.LoggerFactory
+import org.typelevel.ci.CIString
+import org.typelevel.vault.Key
 
 import java.util.UUID
 
@@ -17,7 +17,7 @@ import java.util.UUID
   * Use method `retrieveCorrelationId` to get the value from request attributes.
   */
 class CorrelationIdMiddleware[F[_]: Sync](
-    correlationIdHeaderName: CaseInsensitiveString,
+    correlationIdHeaderName: CIString,
     attributeKey: Key[CorrelationId],
     generator: () => String
 ) {
@@ -29,7 +29,7 @@ class CorrelationIdMiddleware[F[_]: Sync](
   def wrap(routes: HttpRoutes[F]): HttpRoutes[F] =
     Kleisli[OptionT[F, *], Request[F], Response[F]] { request =>
       request.headers.get(correlationIdHeaderName) match {
-        case Some(header) =>
+        case Some(NonEmptyList(header, _)) =>
           val requestWithAttribute = request.withAttribute(attributeKey, CorrelationId(header.value))
           routes(requestWithAttribute).map(r => r.withHeaders(r.headers.put(header)))
         case None =>
@@ -38,7 +38,7 @@ class CorrelationIdMiddleware[F[_]: Sync](
             _ <- log(newCorrelationId)
             requestWithAttribute = request.withAttribute(attributeKey, CorrelationId(newCorrelationId))
             response <- routes(requestWithAttribute)
-          } yield response.withHeaders(response.headers.put(Header(correlationIdHeaderName.value, newCorrelationId)))
+          } yield response.withHeaders(response.headers.put(Header.Raw(correlationIdHeaderName, newCorrelationId)))
       }
     }
 
@@ -62,7 +62,7 @@ object CorrelationIdMiddleware {
   @SuppressWarnings(Array("scalafix:Disable.toString"))
   def default[F[_]: Sync]: F[CorrelationIdMiddleware[F]] = {
     Key.newKey[F, CorrelationId].map { attributeKey =>
-      new CorrelationIdMiddleware(CaseInsensitiveString("Correlation-ID"), attributeKey, () => UUID.randomUUID().toString)
+      new CorrelationIdMiddleware(CIString("Correlation-ID"), attributeKey, () => UUID.randomUUID().toString)
     }
   }
 
diff --git a/http4s-server/src/test/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddlewareTest.scala b/http4s-server/src/test/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddlewareTest.scala
index 4465aacab..27cf44fe7 100644
--- a/http4s-server/src/test/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddlewareTest.scala
+++ b/http4s-server/src/test/scala/com/avast/sst/http4s/server/middleware/CorrelationIdMiddlewareTest.scala
@@ -2,12 +2,12 @@ package com.avast.sst.http4s.server.middleware
 
 import cats.effect.{ContextShift, IO, Resource, Timer}
 import com.avast.sst.http4s.server.Http4sRouting
-import org.http4s.client.blaze.BlazeClientBuilder
+import org.http4s.blaze.client.BlazeClientBuilder
+import org.http4s.blaze.server.BlazeServerBuilder
 import org.http4s.dsl.Http4sDsl
-import org.http4s.server.blaze.BlazeServerBuilder
-import org.http4s.util.CaseInsensitiveString
 import org.http4s.{Header, HttpRoutes, Request, Uri}
 import org.scalatest.funsuite.AsyncFunSuite
+import org.typelevel.ci.CIString
 
 import java.net.InetSocketAddress
 import scala.concurrent.ExecutionContext
@@ -25,7 +25,7 @@ class CorrelationIdMiddlewareTest extends AsyncFunSuite with Http4sDsl[IO] {
         middleware.wrap {
           HttpRoutes.of[IO] { case req @ GET -> Root / "test" =>
             val id = middleware.retrieveCorrelationId(req)
-            Ok("test").map(_.withHeaders(Header("Attribute-Value", id.toString)))
+            Ok("test").map(_.withHeaders(Header.Raw(CIString("Attribute-Value"), id.toString)))
           }
         }
       }
@@ -41,12 +41,12 @@ class CorrelationIdMiddlewareTest extends AsyncFunSuite with Http4sDsl[IO] {
         client
           .run(
             Request[IO](uri = Uri.unsafeFromString(s"http://${server.address.getHostString}:${server.address.getPort}/test"))
-              .withHeaders(Header("Correlation-Id", "test-value"))
+              .withHeaders(Header.Raw(CIString("Correlation-Id"), "test-value"))
           )
           .use { response =>
             IO.delay {
-              assert(response.headers.get(CaseInsensitiveString("Correlation-Id")).get.value === "test-value")
-              assert(response.headers.get(CaseInsensitiveString("Attribute-Value")).get.value === "Some(CorrelationId(test-value))")
+              assert(response.headers.get(CIString("Correlation-Id")).get.head.value === "test-value")
+              assert(response.headers.get(CIString("Attribute-Value")).get.head.value === "Some(CorrelationId(test-value))")
             }
           }
       }
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index e9715ac5e..4be052d44 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -45,7 +45,7 @@ object Dependencies {
     val datastaxJavaDriverCore = "4.13.0"
     val doobie = "0.13.4"
     val grpc = "1.39.0"
-    val http4s = "0.21.25"
+    val http4s = "0.22.2"
     val micrometerCore = "1.7.2"
     val micrometerJmx = "1.7.2"
     val micrometerStatsD = "1.7.2"