diff --git a/kryo/src/main/scala/fluence/codec/kryo/KryoCodecs.scala b/kryo/src/main/scala/fluence/codec/kryo/KryoCodecs.scala
index 42cd08a..b4e9fc4 100644
--- a/kryo/src/main/scala/fluence/codec/kryo/KryoCodecs.scala
+++ b/kryo/src/main/scala/fluence/codec/kryo/KryoCodecs.scala
@@ -17,7 +17,6 @@
 
 package fluence.codec.kryo
 
-import cats.MonadError
 import com.twitter.chill.KryoPool
 import fluence.codec.{CodecError, PureCodec}
 import shapeless._
@@ -30,11 +29,9 @@ import scala.util.control.NonFatal
  * Wrapper for a KryoPool with a list of registered classes
  *
  * @param pool Pre-configured KryoPool
- * @param F Applicative error
  * @tparam L List of classes registered with kryo
- * @tparam F Effect
  */
-class KryoCodecs[F[_], L <: HList] private (pool: KryoPool)(implicit F: MonadError[F, Throwable]) {
+class KryoCodecs[L <: HList] private (pool: KryoPool) {
 
   /**
    * Returns a codec for any registered type
@@ -108,10 +105,10 @@ object KryoCodecs {
      * @tparam F Effect type
      * @return Configured instance of KryoCodecs
      */
-    def build[F[_]](
+    def build(
       poolSize: Int = Runtime.getRuntime.availableProcessors
-    )(implicit F: MonadError[F, Throwable]): KryoCodecs[F, L] =
-      new KryoCodecs[F, L](
+    ): KryoCodecs[L] =
+      new KryoCodecs[L](
         KryoPool.withByteArrayOutputStream(
           poolSize,
           KryoFactory(klasses, registrationRequired = true) // registrationRequired should never be needed, as codec derivation is typesafe
diff --git a/kryo/src/test/scala/fluence/codec/kryo/KryoCodecsSpec.scala b/kryo/src/test/scala/fluence/codec/kryo/KryoCodecsSpec.scala
index cdaab89..ea16490 100644
--- a/kryo/src/test/scala/fluence/codec/kryo/KryoCodecsSpec.scala
+++ b/kryo/src/test/scala/fluence/codec/kryo/KryoCodecsSpec.scala
@@ -18,6 +18,7 @@
 package fluence.codec.kryo
 
 import cats.instances.try_._
+import cats.syntax.profunctor._
 import org.scalatest.{Matchers, WordSpec}
 
 import scala.util.Try
@@ -31,15 +32,15 @@ class KryoCodecsSpec extends WordSpec with Matchers {
     KryoCodecs()
       .add[Array[Array[Byte]]]
       .addCase(classOf[TestClass])
-      .build[Try]()
+      .build()
 
   "encode and decode" should {
     "be inverse functions" when {
       "object defined" in {
 
-        val codec = testCodecs.codec[TestClass]
+        val codec = testCodecs.pureCodec[TestClass]
 
-        val result = codec.encode(testClass).flatMap(codec.decode).get
+        val result = codec.inverse.unsafe(codec.direct.unsafe(testClass))
 
         result.str shouldBe "one"
         result.num shouldBe 2
@@ -47,8 +48,8 @@ class KryoCodecsSpec extends WordSpec with Matchers {
       }
 
       "object is null" in {
-        val codec = testCodecs.codec[TestClass]
-        val result = codec.encode(null).flatMap(codec.decode)
+        val codec = testCodecs.pureCodec[TestClass]
+        val result = codec.direct.runF[Try](null).flatMap(codec.inverse.runF[Try])
         result.isFailure shouldBe true
       }
     }
@@ -57,9 +58,8 @@ class KryoCodecsSpec extends WordSpec with Matchers {
   "encode" should {
     "not write full class name to binary representation" when {
       "class registered" in {
-        //val codec = KryoCodec[TestClass](Seq(classOf[TestClass], classOf[Array[Byte]], classOf[Array[Array[Byte]]]), registerRequired = true)
-        val codec = testCodecs.codec[TestClass]
-        val encoded = codec.encode(testClass).map(new String(_)).get
+        val codec = testCodecs.pureCodec[TestClass]
+        val encoded = codec.direct.rmap(new String(_)).unsafe(testClass)
         val reasonableMaxSize = 20 // bytes
         encoded should not contain "TestClass"
         encoded.length should be < reasonableMaxSize