diff --git a/.travis.yml b/.travis.yml
index c4c275c..a26b223 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,12 @@
+os: linux
 language: scala
-sudo: required
-dist: trusty
+dist: bionic
 addons:
   apt:
     update: true
 
 jdk:
-  - oraclejdk8
+  - openjdk8
 
 script:
-  - curl https://raw.githubusercontent.com/scala-native/scala-native/master/scripts/travis_setup.sh | bash -x
   - ./mill __.test.run
diff --git a/build.sc b/build.sc
index 8dc15f1..77880b5 100644
--- a/build.sc
+++ b/build.sc
@@ -1,5 +1,19 @@
 import mill._, scalalib._, scalajslib._, scalanativelib._, publish._
 
+val dottyVersions = sys.props.get("dottyVersion").toList
+
+val scalaVersions = "2.11.12" :: "2.12.13" :: "2.13.4" :: "3.0.0-M3" :: dottyVersions
+val scala2Versions = scalaVersions.filter(_.startsWith("2."))
+
+val scalaJSVersions = for {
+  scalaV <- scala2Versions
+  scalaJSV <- Seq("0.6.33", "1.4.0")
+} yield (scalaV, scalaJSV)
+
+val scalaNativeVersions = for {
+  scalaV <- scala2Versions
+  scalaNativeV <- Seq("0.4.0")
+} yield (scalaV, scalaNativeV)
 
 trait SourcecodeModule extends PublishModule {
   def artifactName = "sourcecode"
@@ -64,8 +78,8 @@ trait SourcecodeTestModule extends ScalaModule {
 }
 
 object sourcecode extends Module {
-  val dottyVersion = Option(sys.props("dottyVersion"))
-  object jvm extends Cross[JvmSourcecodeModule]((List("2.11.12", "2.12.8", "2.13.0", "3.0.0-M3") ++ dottyVersion): _*)
+  val dottyVersion = sys.props.get("dottyVersion")
+  object jvm extends Cross[JvmSourcecodeModule](scalaVersions: _*)
   class JvmSourcecodeModule(val crossScalaVersion: String)
     extends SourcecodeMainModule with ScalaModule with SourcecodeModule {
 
@@ -85,10 +99,7 @@ object sourcecode extends Module {
       }
   }
 
-  object js extends Cross[JsSourcecodeModule](
-    ("2.11.12", "0.6.33"), ("2.12.10", "0.6.33"), ("2.13.1", "0.6.33"),
-    ("2.11.12", "1.0.0"), ("2.12.10", "1.0.0"), ("2.13.1", "1.0.0")
-  )
+  object js extends Cross[JsSourcecodeModule](scalaJSVersions: _*)
   class JsSourcecodeModule(val crossScalaVersion: String, crossJSVersion: String)
     extends SourcecodeMainModule with ScalaJSModule with SourcecodeModule {
     def offset = os.up
@@ -103,7 +114,7 @@ object sourcecode extends Module {
     }
   }
 
-  object native extends Cross[NativeSourcecodeModule](("2.11.12", "0.3.9"), ("2.11.12", "0.4.0-M2"))
+  object native extends Cross[NativeSourcecodeModule](scalaNativeVersions: _*)
   class NativeSourcecodeModule(val crossScalaVersion: String, crossScalaNativeVersion: String)
     extends SourcecodeMainModule with ScalaNativeModule with SourcecodeModule {
     def offset = os.up
diff --git a/mill b/mill
index 4afe22c..11a4b58 100755
--- a/mill
+++ b/mill
@@ -3,7 +3,7 @@
 # This is a wrapper script, that automatically download mill from GitHub release pages
 # You can give the required mill version with MILL_VERSION env variable
 # If no version is given, it falls back to the value of DEFAULT_MILL_VERSION
-DEFAULT_MILL_VERSION=0.8.0-13-105f53
+DEFAULT_MILL_VERSION=0.9.4-18-82ea87
 
 set -e