diff --git a/build.sbt b/build.sbt
index 51d40260..be077e7b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -124,7 +124,7 @@ ThisBuild / Test / jsEnv := {
 
 val catsEffectVersion = "3.3.14"
 val fs2Version = "3.2.12"
-val http4sVersion = "1.0.0-M34"
+val http4sVersion = "1.0.0-M36"
 val scalaJSDomVersion = "2.2.0"
 val circeVersion = "0.14.2"
 val munitVersion = "0.7.29"
diff --git a/dom/src/main/scala/org/http4s/dom/FetchClient.scala b/dom/src/main/scala/org/http4s/dom/FetchClient.scala
index 11848da5..43ed2cec 100644
--- a/dom/src/main/scala/org/http4s/dom/FetchClient.scala
+++ b/dom/src/main/scala/org/http4s/dom/FetchClient.scala
@@ -31,6 +31,7 @@ import org.scalajs.dom.Headers
 import org.scalajs.dom.HttpMethod
 import org.scalajs.dom.RequestInit
 import org.scalajs.dom.{Response => FetchResponse}
+import scodec.bits.ByteVector
 
 import java.util.concurrent.TimeoutException
 import scala.concurrent.duration._
@@ -44,8 +45,8 @@ private[dom] object FetchClient {
     Resource.eval(req.toStrict(None)).flatMap { req =>
       val body = req.entity match {
         case Entity.Empty => None
-        case Entity.Strict(chunk) => Some(chunk)
-        case default => default.body.chunkAll.filter(_.nonEmpty).compile.last
+        case Entity.Strict(bytes) => Some(bytes)
+        case default => Some(default.body.compile.to(ByteVector)).filter(_.nonEmpty)
       }
 
       Resource
diff --git a/dom/src/main/scala/org/http4s/dom/ServiceWorker.scala b/dom/src/main/scala/org/http4s/dom/ServiceWorker.scala
index 17611d46..ff0885ea 100644
--- a/dom/src/main/scala/org/http4s/dom/ServiceWorker.scala
+++ b/dom/src/main/scala/org/http4s/dom/ServiceWorker.scala
@@ -26,13 +26,13 @@ import cats.effect.kernel.Deferred
 import cats.effect.std.Supervisor
 import cats.effect.unsafe.IORuntime
 import cats.syntax.all._
-import fs2.Chunk
 import org.scalajs.dom.Fetch
 import org.scalajs.dom.FetchEvent
 import org.scalajs.dom.ResponseInit
 import org.scalajs.dom.ServiceWorkerGlobalScope
 import org.scalajs.dom.{Response => DomResponse}
 import org.typelevel.vault.Key
+import scodec.bits.ByteVector
 
 object ServiceWorker {
 
@@ -78,14 +78,14 @@ object ServiceWorker {
         uri <- OptionF.fromEither(Uri.fromString(req.url))
         headers = fromDomHeaders(req.headers)
         body <- OptionT.liftF(F.fromPromise(F.delay(req.arrayBuffer())))
-        chunk = Chunk.jsArrayBuffer(body)
-        request = Request[F](method, uri, headers = headers, entity = Entity.Strict(chunk))
+        bytes = ByteVector.fromJSArrayBuffer(body)
+        request = Request[F](method, uri, headers = headers, entity = Entity.Strict(bytes))
           .withAttribute(key, FetchEventContext(event, supervisor))
         response <- routes(request)
         body <- OptionT.liftF(
           response.entity match {
             case Entity.Empty => None.pure
-            case Entity.Strict(chunk) => Some(chunk.toUint8Array).pure
+            case Entity.Strict(bytes) => Some(bytes.toUint8Array).pure
             case default =>
               default.body.chunkAll.filter(_.nonEmpty).map(_.toUint8Array).compile.last
           }