diff --git a/modules/http4s/src/main/scala/org/legogroup/woof/http4s/CorrelationIdMiddleware.scala b/modules/http4s/src/main/scala/org/legogroup/woof/http4s/CorrelationIdMiddleware.scala
index 32daeb0..f85c614 100644
--- a/modules/http4s/src/main/scala/org/legogroup/woof/http4s/CorrelationIdMiddleware.scala
+++ b/modules/http4s/src/main/scala/org/legogroup/woof/http4s/CorrelationIdMiddleware.scala
@@ -2,6 +2,7 @@ package org.legogroup.woof.http4s
 
 import cats.data.{Kleisli, NonEmptyList, OptionT}
 import cats.effect.kernel.Sync
+import cats.effect.std.UUIDGen
 import cats.syntax.all.*
 import cats.{Applicative, FlatMap, Monad}
 import org.http4s.Header.Raw
@@ -16,23 +17,18 @@ object CorrelationIdMiddleware:
 
   private val defaultTraceHeaderName: CIString = CIString("X-Trace-Id")
 
-  trait UUIDGen[F[_]]:
-    def gen: F[UUID]
-  given [F[_]: Sync]: UUIDGen[F] = new UUIDGen[F]:
-    def gen = Sync[F].delay(UUID.randomUUID)
-
   private def getOrGenerate[F[_]: Applicative: UUIDGen](headerName: Option[CIString], request: Request[F]): F[String] =
     val key = headerName.getOrElse(defaultTraceHeaderName)
     request.headers
       .get(key)
       .map(_.head.value)
       .fold(
-        summon[UUIDGen[F]].gen.map(_.toString),
+        summon[UUIDGen[F]].randomUUID.map(_.toString),
       )(_.pure[F])
 
   def middleware[F[_]: Logger: Monad: UUIDGen](headerName: Option[CIString] = None): HttpRoutes[F] => HttpRoutes[F] =
     routes =>
-      Kleisli[([T] =>> OptionT[F, T]), Request[F], Response[F]] { request =>
+      Kleisli[[T] =>> OptionT[F, T], Request[F], Response[F]] { request =>
         val key = headerName.getOrElse(defaultTraceHeaderName)
         for
           traceId <- OptionT.liftF(getOrGenerate(headerName, request))
diff --git a/modules/http4s/src/test/scala/org/legogroup/woof/http4s/CorrelationIdMiddlewareSuite.scala b/modules/http4s/src/test/scala/org/legogroup/woof/http4s/CorrelationIdMiddlewareSuite.scala
index 8e708f2..5a00ae0 100644
--- a/modules/http4s/src/test/scala/org/legogroup/woof/http4s/CorrelationIdMiddlewareSuite.scala
+++ b/modules/http4s/src/test/scala/org/legogroup/woof/http4s/CorrelationIdMiddlewareSuite.scala
@@ -1,13 +1,13 @@
 package org.legogroup.woof.http4s
 
 import cats.data.{Kleisli, OptionT}
+import cats.effect.std.UUIDGen
 import cats.effect.{Clock, IO}
 import cats.syntax.all.*
 import cats.{Applicative, Monad}
 import munit.CatsEffectSuite
 import org.http4s.{HttpRoutes, Request, Response}
 import org.legogroup.woof.{*, given}
-import org.legogroup.woof.http4s.CorrelationIdMiddleware.UUIDGen
 import org.typelevel.ci.CIString
 
 import java.time.ZoneId
@@ -24,9 +24,9 @@ class CorrelationIdMiddlewareSuite extends CatsEffectSuite:
   given Printer = NoColorPrinter()
   given Filter  = Filter.everything
 
-  val testUuid = UUID.fromString("E20A27FE-5142-4E21-BA09-35BC6FB84591")
+  val testUuid: UUID = UUID.fromString("E20A27FE-5142-4E21-BA09-35BC6FB84591")
   given UUIDGen[IO] with
-    def gen = testUuid.pure[IO]
+    def randomUUID: IO[UUID] = testUuid.pure[IO]
 
   test("add trace id with middleware") {