diff --git a/build.sbt b/build.sbt
index b9014bc..b7b41d4 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,12 +10,7 @@ val circeV = "0.14.6"
 
 lazy val common = project
   .in(file("common"))
-  .settings(
-    name := "todobackend-common",
-    libraryDependencies ++= Seq(
-      "io.circe" %% "circe-generic" % circeV
-    )
-  )
+  .settings(name := "todobackend-common")
 
 val http4sV = "1.0.0-M40"
 val logbackV = "1.4.11"
@@ -31,6 +26,7 @@ lazy val `todobackend-http4s` = project
       "org.http4s" %% "http4s-ember-server" % http4sV,
       "org.http4s" %% "http4s-dsl" % http4sV,
       "org.http4s" %% "http4s-circe" % http4sV,
+      "io.circe" %% "circe-generic" % circeV,
       "ch.qos.logback" % "logback-classic" % logbackV,
       "org.scalameta" %% "munit" % munitV % Test,
       "org.typelevel" %% "munit-cats-effect" % munitCE3V % Test
diff --git a/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoItem.scala b/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoItem.scala
index 0d30824..6a4874e 100644
--- a/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoItem.scala
+++ b/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoItem.scala
@@ -1,8 +1,5 @@
 package es.jesusmtnez.todobackend.domain
 
-import io.circe.*
-import io.circe.generic.semiauto.*
-
 import java.util.UUID
 
 final case class TodoItem(
@@ -13,8 +10,6 @@ final case class TodoItem(
 )
 
 object TodoItem:
-  given Codec[TodoItem] = deriveCodec
-
   private val baseUrl: String = "http://localhost:8080"
 
   def uncompleted(id: UUID, title: String, order: Int): TodoItem =
diff --git a/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoRequest.scala b/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoRequest.scala
new file mode 100644
index 0000000..1339c47
--- /dev/null
+++ b/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoRequest.scala
@@ -0,0 +1,6 @@
+package es.jesusmtnez.todobackend.domain
+
+final case class TodoRequest(
+    title: String,
+    order: Option[Int]
+)
diff --git a/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/domain/TodoUpdate.scala b/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoUpdate.scala
similarity index 53%
rename from todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/domain/TodoUpdate.scala
rename to common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoUpdate.scala
index b57bd84..966c07a 100644
--- a/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/domain/TodoUpdate.scala
+++ b/common/src/main/scala/es/jesusmtnez/todobackend/domain/TodoUpdate.scala
@@ -1,13 +1,7 @@
 package es.jesusmtnez.todobackend.domain
 
-import io.circe.Decoder
-import io.circe.generic.semiauto.deriveDecoder
-
 final case class TodoUpdate(
     title: Option[String],
     completed: Option[Boolean],
     order: Option[Int]
 )
-
-object TodoUpdate:
-  given Decoder[TodoUpdate] = deriveDecoder
diff --git a/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/TodoBackendRoutes.scala b/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/TodoBackendRoutes.scala
index 2b4fa6a..480b6e8 100644
--- a/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/TodoBackendRoutes.scala
+++ b/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/TodoBackendRoutes.scala
@@ -4,6 +4,8 @@ import buildinfo.BuildInfo
 import cats.effect.*
 import cats.syntax.all.*
 import es.jesusmtnez.todobackend.domain.*
+import io.circe.*
+import io.circe.generic.semiauto.*
 import org.http4s.HttpRoutes
 import org.http4s.circe.*
 import org.http4s.dsl.Http4sDsl
@@ -21,6 +23,10 @@ object TodoBackendRoutes:
     val dsl = new Http4sDsl[F] {}
     import dsl._
 
+    implicit val todoItemCodec: Codec[TodoItem] = deriveCodec
+    implicit val todoRequestDecoder: Decoder[TodoRequest] = deriveDecoder
+    implicit val todoUpdateDecoder: Decoder[TodoUpdate] = deriveDecoder
+
     import org.http4s.circe.CirceEntityCodec.*
 
     HttpRoutes.of[F]:
diff --git a/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/domain/TodoRequest.scala b/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/domain/TodoRequest.scala
deleted file mode 100644
index 305bac6..0000000
--- a/todobackend-http4s/src/main/scala/es/jesusmtnez/todobackend/domain/TodoRequest.scala
+++ /dev/null
@@ -1,12 +0,0 @@
-package es.jesusmtnez.todobackend.domain
-
-import io.circe.Decoder
-import io.circe.generic.semiauto.deriveDecoder
-
-final case class TodoRequest(
-    title: String,
-    order: Option[Int]
-)
-
-object TodoRequest:
-  given Decoder[TodoRequest] = deriveDecoder