diff --git a/src/main/scala/eu/neverblink/jelly/cli/command/rdf/RdfSerDesCommand.scala b/src/main/scala/eu/neverblink/jelly/cli/command/rdf/RdfSerDesCommand.scala
index e14589c..b16072d 100644
--- a/src/main/scala/eu/neverblink/jelly/cli/command/rdf/RdfSerDesCommand.scala
+++ b/src/main/scala/eu/neverblink/jelly/cli/command/rdf/RdfSerDesCommand.scala
@@ -1,21 +1,21 @@
 package eu.neverblink.jelly.cli.command.rdf
 
+import caseapp.*
 import com.google.protobuf.InvalidProtocolBufferException
-import org.apache.jena.riot.RiotException
 import eu.neverblink.jelly.cli.*
-import caseapp.*
 import eu.neverblink.jelly.cli.command.rdf.util.{RdfCommandPrintUtil, RdfFormat}
-
-import scala.reflect.TypeTest
 import eu.neverblink.jelly.core.{RdfProtoDeserializationError, RdfProtoSerializationError}
+import org.apache.jena.riot.RiotException
 
 import java.io.{InputStream, OutputStream}
+import scala.reflect.Typeable
 
 /** This abstract class is responsible for the common logic in both RDF parsing commands
   */
-abstract class RdfSerDesCommand[T <: HasJellyCommandOptions: {Parser, Help}, F <: RdfFormat](using
-    tt: TypeTest[RdfFormat, F],
-) extends JellyCommand[T]:
+abstract class RdfSerDesCommand[
+    T <: HasJellyCommandOptions: {Parser, Help},
+    F <: RdfFormat: Typeable,
+] extends JellyCommand[T]:
 
   override final def group = "rdf"
 
diff --git a/src/main/scala/eu/neverblink/jelly/cli/command/rdf/util/RdfCommandPrintUtil.scala b/src/main/scala/eu/neverblink/jelly/cli/command/rdf/util/RdfCommandPrintUtil.scala
index 90fd85d..4368a7a 100644
--- a/src/main/scala/eu/neverblink/jelly/cli/command/rdf/util/RdfCommandPrintUtil.scala
+++ b/src/main/scala/eu/neverblink/jelly/cli/command/rdf/util/RdfCommandPrintUtil.scala
@@ -1,8 +1,8 @@
 package eu.neverblink.jelly.cli.command.rdf.util
 
-import scala.reflect.TypeTest
+import scala.reflect.Typeable
 
-trait RdfCommandPrintUtil[F <: RdfFormat](using tt: TypeTest[RdfFormat, F]):
+trait RdfCommandPrintUtil[F <: RdfFormat: Typeable]:
   val defaultFormat: RdfFormat
 
   lazy val validFormats: List[RdfFormat] = RdfFormat.all.collect { case x: F => x }