diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88c7402060..cdae7d3c19 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1256,7 +1256,7 @@ jobs:
       env:
         PGP_SECRET: ${{ secrets.PGP_SECRET }}
     - run: ./mill -i ci.setShouldPublish
-    - run: ./mill -i publishSonatype '{__[],_}.publishArtifacts'
+    - run: ./mill -i publishSonatype '{__[],_,test-runner[2.13.13],test-runner[2.12.19],runner[2.13.13],runner[2.12.19]}.publishArtifacts'
       if: env.SHOULD_PUBLISH == 'true'
       env:
         PGP_PASSWORD: ${{ secrets.PGP_PASSPHRASE }}
diff --git a/build.sc b/build.sc
index da3dc9210f..b26207b706 100644
--- a/build.sc
+++ b/build.sc
@@ -39,8 +39,17 @@ implicit def millModuleBasePath: define.Ctx.BasePath =
 
 object cli extends Cross[Cli](Scala.scala3MainVersions) with CrossScalaDefaultToInternal
 
-trait CrossScalaDefaultToInternal { _: mill.define.Cross[_] =>
-  def defaultCrossSegments = Seq(Scala.defaultInternal)
+trait CrossScalaDefault { _: mill.define.Cross[_] =>
+  def crossScalaDefaultVersion: String
+  def defaultCrossSegments = Seq(crossScalaDefaultVersion)
+}
+
+trait CrossScalaDefaultToInternal extends CrossScalaDefault { _: mill.define.Cross[_] =>
+  def crossScalaDefaultVersion: String = Scala.defaultInternal
+}
+
+trait CrossScalaDefaultToRunner extends CrossScalaDefault { _: mill.define.Cross[_] =>
+  def crossScalaDefaultVersion: String = Scala.runnerScala3
 }
 
 // Publish a bootstrapped, executable jar for a restricted environments
@@ -82,9 +91,9 @@ object directives extends Cross[Directives](Scala.scala3MainVersions)
 object core           extends Cross[Core](Scala.scala3MainVersions) with CrossScalaDefaultToInternal
 object `build-module` extends Cross[Build](Scala.scala3MainVersions)
     with CrossScalaDefaultToInternal
-object runner extends Cross[Runner](Scala.runnerScalaVersions) with CrossScalaDefaultToInternal
+object runner        extends Cross[Runner](Scala.runnerScalaVersions) with CrossScalaDefaultToRunner
 object `test-runner` extends Cross[TestRunner](Scala.testRunnerScalaVersions)
-    with CrossScalaDefaultToInternal
+    with CrossScalaDefaultToRunner
 object `tasty-lib` extends Cross[TastyLib](Scala.all) with CrossScalaDefaultToInternal
 // Runtime classes used within native image on Scala 3 replacing runtime from Scala
 object `scala3-runtime` extends Cross[Scala3Runtime](Scala.scala3MainVersions)