diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a9f9de5..f9a9bfc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        scalaversion: ["2.11.12", "2.12.11", "2.13.2"]
+        scalaversion: ["2.11.12", "2.12.11", "2.13.2", "3.x"]
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-java@v5
diff --git a/build.sbt b/build.sbt
index ba2b1dd..f30a2db 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,11 +1,11 @@
 val previousVersion: Option[String] = Some("1.1.1")
-val newScalaBinaryVersionsInThisRelease: Set[String] = Set()
+val newScalaBinaryVersionsInThisRelease: Set[String] = Set("3")
 
 inThisBuild(Def.settings(
   version := "1.1.2-SNAPSHOT",
   organization := "org.scala-js",
   scalaVersion := "2.12.11",
-  crossScalaVersions := Seq("2.11.12", "2.12.11", "2.13.2"),
+  crossScalaVersions := Seq("2.11.12", "2.12.11", "2.13.2", "3.3.6"),
   scalacOptions ++= Seq(
     "-deprecation",
     "-feature",
@@ -79,6 +79,7 @@ val commonSettings = Def.settings(
        |""".stripMargin
   )),
 
+  mimaFailOnNoPrevious := newScalaBinaryVersionsInThisRelease.isEmpty,
   // MiMa auto-configuration
   mimaPreviousArtifacts ++= {
     val scalaV = scalaVersion.value
diff --git a/project/build.properties b/project/build.properties
index 9edb75b..5e6884d 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.4
+sbt.version=1.11.6