diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dbb89abb..f2f2bcc6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,6 +33,7 @@ jobs:
         case ${{ matrix.java }} in
           "8")
             sbt -v ++2.12.x "scalaxbPlugin/scripted"
+            sbt -v ++3.x "app/Test/compile"
             sbt -v +integration/test
             ;;
           "21")
diff --git a/build.sbt b/build.sbt
index e2ae3ef2..d01d3701 100644
--- a/build.sbt
+++ b/build.sbt
@@ -54,7 +54,7 @@ lazy val app = (project in file("cli"))
   .settings(codegenSettings)
   .settings(nocomma {
     name := "scalaxb"
-    crossScalaVersions := Seq(scala213, scala212, scala211, scala210)
+    crossScalaVersions := Seq(scala3, scala213, scala212, scala211, scala210)
     scalaVersion := scala212
     resolvers += sbtResolver.value
     libraryDependencies ++= appDependencies(scalaVersion.value)
diff --git a/project/dependencies.scala b/project/dependencies.scala
index c65a9177..8531e246 100644
--- a/project/dependencies.scala
+++ b/project/dependencies.scala
@@ -1,13 +1,21 @@
 import sbt._
 
 object Dependencies {
+  val scala3   = "3.3.1"
   val scala213 = "2.13.12"
   val scala212 = "2.12.18"
   val scala211 = "2.11.12"
   val scala210 = "2.10.7"
 
   val jaxb = "javax.xml.bind" % "jaxb-api" % "2.3.1"
-  val scopt = "com.github.scopt" %% "scopt" % "3.7.1"
+  def scopt(sv: String) = {
+    CrossVersion.partialVersion(sv) match {
+      case Some((2, _)) =>
+        "com.github.scopt" %% "scopt" % "3.7.1"
+      case _ =>
+        "com.github.scopt" %% "scopt" % "4.1.0"
+    }
+  }
   val log4j = "log4j" % "log4j" % "1.2.17"
   val defaultDispatchVersion = "1.0.1"
   def dispatch(sv: String) = CrossVersion partialVersion sv match {
@@ -63,13 +71,13 @@ object Dependencies {
   def appDependencies(sv: String) = Seq(
     launcherInterface % "provided",
     jaxb % "provided",
-    scopt,
+    scopt(sv),
     log4j
   ) ++ (sv match {
     case x if sv.startsWith("2.10.") => Nil
     case x if sv.startsWith("2.11.") => Seq(scalaXml1, scalaParserCombinators1)
     case x if sv.startsWith("2.12.") => Seq(scalaXml2, scalaParserCombinators1)
-    case x if sv.startsWith("2.13.") => Seq(scalaXml2, scalaParserCombinators2)
+    case x                           => Seq(scalaXml2, scalaParserCombinators2)
   })
   def integrationDependencies(sv: String) = Seq(
     dispatch(sv) % "test",