Make it compile

build.sbt

@@ -9,11 +9,18 @@ lazy val logback               = "ch.qos.logback"          % "logback-classic"
 
 enablePlugins(ZioSbtEcosystemPlugin, ZioSbtCiPlugin)
 
+lazy val _scala213 = "2.13.13"
+lazy val _scala3 = "3.3.3"
+
 inThisBuild(
   List(
     name                     := "ZIO Kafka",
     zioVersion               := "2.0.21",
-    crossScalaVersions       := List("2.13.13", "3.3.3"),
+    scalaVersion             := _scala213,
+    // zio-sbt defines these 'scala213' and 'scala3' settings, but we need to define them here to override the defaults and better control them
+    scala213                 := _scala213,
+    scala3                   := _scala3,
+    crossScalaVersions       := List(scala213.value, scala3.value), // We only support Scala 2.13+ and 3+. See https://github.com/zio/zio-kafka/releases/tag/v2.7.0
     ciEnabledBranches        := Seq("master", "series/0.x"),
     useCoursier              := false,
     Test / parallelExecution := false,