:= "2.13.3" 変更前 lazy val akkaVersion = "2.6.8" lazy val root = (project in file(".")) .settings( name := "akka-quickstart-scala", version := "0.1", scalaVersion := "2.13.3", // サンプルコードは、 2.13.1だけど最新にしよう libraryDependencies ++= Seq( "com.typesafe.akka" %% "akka-actor-typed" % akkaVersion, "com.typesafe.akka" %% "akka-slf4j" % akkaVersion, "ch.qos.logback" % "logback-classic" % "1.2.3" excludeAll ExclusionRule(organization = "org.slf4j"), "com.typesafe.akka" %% "akka-actor-testkit-typed" % akkaVersion % Test, "org.scalatest" %% "scalatest" % "3.1.0" % Test ) ) 変更後