The Akka dependencies are available from Akka’s secure library repository. To access them you need to use a secure, tokenized URL as specified at https://account.akka.io/token. To use Classic Actors, add the following dependency in your project: sbtval AkkaVersion = "2.10.8" libraryDependencies ++= Seq( "com.typesafe.akka" %% "akka-actor" % AkkaVersion, "com.typesafe.akka" %% "akka-testkit" % Akka