diff --git a/src/main/scala/net/kemitix/s3thorp/Main.scala b/src/main/scala/net/kemitix/s3thorp/Main.scala
index 757db0b..06b2e79 100644
--- a/src/main/scala/net/kemitix/s3thorp/Main.scala
+++ b/src/main/scala/net/kemitix/s3thorp/Main.scala
@@ -12,7 +12,7 @@ object Main extends IOApp {
   val defaultConfig: Config =
     Config("(none)", "", Paths.get(".").toFile)
 
-  val sync = new Sync()
+  val sync = new Sync(new ReactiveS3Client())
 
   def program(args: List[String]): IO[ExitCode] =
     for {
diff --git a/src/main/scala/net/kemitix/s3thorp/ReactiveS3Client.scala b/src/main/scala/net/kemitix/s3thorp/ReactiveS3Client.scala
new file mode 100644
index 0000000..4d45820
--- /dev/null
+++ b/src/main/scala/net/kemitix/s3thorp/ReactiveS3Client.scala
@@ -0,0 +1,20 @@
+package net.kemitix.s3thorp
+
+import cats.effect.IO
+import com.github.j5ik2o.reactive.aws.s3.S3AsyncClient
+import software.amazon.awssdk.services.s3.model.HeadObjectRequest
+import software.amazon.awssdk.services.s3.{S3AsyncClient => JavaS3AsyncClient}
+
+class ReactiveS3Client extends S3Client {
+
+  val s3Client = S3AsyncClient(JavaS3AsyncClient.create())
+
+  override def objectHead(bucket: String, key: String) = {
+    IO.fromFuture(IO(
+      s3Client.headObject(HeadObjectRequest.builder()
+        .bucket(bucket)
+        .key(key)
+        .build()))).
+      map(r => (r.eTag(), r.lastModified()))
+  }
+}
diff --git a/src/main/scala/net/kemitix/s3thorp/S3Client.scala b/src/main/scala/net/kemitix/s3thorp/S3Client.scala
index 7ce20cf..af049a9 100644
--- a/src/main/scala/net/kemitix/s3thorp/S3Client.scala
+++ b/src/main/scala/net/kemitix/s3thorp/S3Client.scala
@@ -1,9 +1,10 @@
 package net.kemitix.s3thorp
 
+import cats.effect.IO
 import net.kemitix.s3thorp.Sync.{Hash, LastModified}
 
 trait S3Client {
 
-  def objectHead(bucket: String, key: String): (Hash, LastModified)
+  def objectHead(bucket: String, key: String): IO[(Hash, LastModified)]
 
 }
diff --git a/src/main/scala/net/kemitix/s3thorp/S3MetaDataEnricher.scala b/src/main/scala/net/kemitix/s3thorp/S3MetaDataEnricher.scala
index 6ec12ac..f2741f7 100644
--- a/src/main/scala/net/kemitix/s3thorp/S3MetaDataEnricher.scala
+++ b/src/main/scala/net/kemitix/s3thorp/S3MetaDataEnricher.scala
@@ -18,7 +18,7 @@ trait S3MetaDataEnricher extends S3Client {
       Stream.eval(for {
         _ <- putStrLn(s"enrich: $file")
         key = fileToString(file)
-        head <- IO(objectHead(c.bucket, key))
+        head <- objectHead(c.bucket, key)
         (hash, lastModified) = head
       } yield S3MetaData(file, key, hash, lastModified))
   }
diff --git a/src/main/scala/net/kemitix/s3thorp/Sync.scala b/src/main/scala/net/kemitix/s3thorp/Sync.scala
index 7732aaa..4e99918 100644
--- a/src/main/scala/net/kemitix/s3thorp/Sync.scala
+++ b/src/main/scala/net/kemitix/s3thorp/Sync.scala
@@ -1,19 +1,18 @@
 package net.kemitix.s3thorp
 
 import java.io.File
-import java.nio.file.Path
 import java.time.Instant
 
 import cats.effect._
 import fs2.Stream
 import net.kemitix.s3thorp.Main.putStrLn
-import net.kemitix.s3thorp.Sync.{Hash, LastModified}
 
 import scala.concurrent.Promise
 
-class Sync extends LocalFileStream with S3MetaDataEnricher {
+class Sync(s3Client: S3Client) extends LocalFileStream with S3MetaDataEnricher {
 
-  override def objectHead(bucket: String, key: String): (Hash, LastModified) = ???
+  override def objectHead(bucket: String, key: String)=
+    s3Client.objectHead(bucket, key)
 
   def run(c: Config): IO[Unit] = for {
     _ <- putStrLn(s"Bucket: ${c.bucket}, Prefix: ${c.prefix}, Source: ${c.source}")
diff --git a/src/test/scala/net/kemitix/s3thorp/S3MetaDataEnricherSuite.scala b/src/test/scala/net/kemitix/s3thorp/S3MetaDataEnricherSuite.scala
index cd9a830..e33c6d7 100644
--- a/src/test/scala/net/kemitix/s3thorp/S3MetaDataEnricherSuite.scala
+++ b/src/test/scala/net/kemitix/s3thorp/S3MetaDataEnricherSuite.scala
@@ -3,7 +3,6 @@ package net.kemitix.s3thorp
 import java.io.File
 import java.nio.file.Paths
 
-import net.kemitix.s3thorp.Sync.{Hash, LastModified}
 import org.scalatest.FunSpec
 
 class S3MetaDataEnricherSuite extends FunSpec {
@@ -34,6 +33,6 @@ class S3MetaDataEnricherSuite extends FunSpec {
         }
       }
     }
-    override def objectHead(bucket: String, key: String): (Hash, LastModified) = ???
+    override def objectHead(bucket: String, key: String) = ???
   }
 }