diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b774d0d..a6f275a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -58,7 +58,7 @@ jobs:
         run: sbt ++${{ matrix.scala }} test
 
       - name: Compress target directories
-        run: tar cf targets.tar joda/target/1-16-jvm-2.13 joda/target/1-16-jvm-3 core/target/1-13-jvm-2.11 core/target/1-15-jvm-2.13 joda/target/1-13-jvm-2.11 joda/target/1-13-jvm-2.12 core/target/1-13-jvm-2.12 core/target/1-15-jvm-2.12 joda/target/1-12-jvm-2.11 joda/target/1-15-jvm-3 joda/target/1-15-jvm-2.13 core/target/1-16-jvm-3 joda/target/1-14-jvm-2.13 target core/target/1-15-jvm-3 joda/target/1-14-jvm-2.12 core/target/1-14-jvm-2.11 core/target/1-16-jvm-2.13 joda/target/1-16-jvm-2.12 joda/target/1-15-jvm-2.12 core/target/1-16-jvm-2.12 core/target/1-14-jvm-2.12 joda/target/1-14-jvm-2.11 core/target/1-12-jvm-2.11 core/target/1-14-jvm-2.13 project/target
+        run: tar cf targets.tar joda/target/1-16-jvm-2.13 joda/target/1-16-jvm-3 core/target/1-13-jvm-2.11 core/target/1-15-jvm-2.13 core/target/1-16-js-3 joda/target/1-13-jvm-2.11 joda/target/1-13-jvm-2.12 core/target/1-16-native-2.13 core/target/1-16-native-3 core/target/1-13-jvm-2.12 core/target/1-15-jvm-2.12 joda/target/1-12-jvm-2.11 core/target/1-15-js-2.12 joda/target/1-15-jvm-3 joda/target/1-15-jvm-2.13 core/target/1-16-jvm-3 core/target/1-15-js-2.13 joda/target/1-14-jvm-2.13 target core/target/1-15-jvm-3 core/target/1-15-js-3 joda/target/1-14-jvm-2.12 core/target/1-16-js-2.12 core/target/1-15-native-3 core/target/1-14-jvm-2.11 core/target/1-16-jvm-2.13 joda/target/1-16-jvm-2.12 joda/target/1-15-jvm-2.12 core/target/1-16-js-2.13 core/target/1-16-jvm-2.12 core/target/1-14-jvm-2.12 joda/target/1-14-jvm-2.11 core/target/1-12-jvm-2.11 core/target/1-14-jvm-2.13 core/target/1-15-native-2.13 project/target
 
       - name: Upload target directories
         uses: actions/upload-artifact@v2
diff --git a/build.sbt b/build.sbt
index 3348449..87ea347 100644
--- a/build.sbt
+++ b/build.sbt
@@ -138,6 +138,38 @@ lazy val `core` = projectMatrix
         ScalaCheckAxis.current.value.scalaTestPlusScalaCheck(scalaVersion.value)
     )
   )
+  .jsPlatform(
+    scalaVersions = Seq(Scala_2_12, Scala_2_13, Scala_3),
+    axisValues = Seq(ScalaCheckAxis.v1_15),
+    settings = Seq(
+      libraryDependencies +=
+        ScalaCheckAxis.current.value.scalaTestPlusScalaCheck(scalaVersion.value)
+    )
+  )
+  .jsPlatform(
+    scalaVersions = Seq(Scala_2_12, Scala_2_13, Scala_3),
+    axisValues = Seq(ScalaCheckAxis.v1_16),
+    settings = Seq(
+      libraryDependencies +=
+        ScalaCheckAxis.current.value.scalaTestPlusScalaCheck(scalaVersion.value)
+    )
+  )
+  .nativePlatform(
+    scalaVersions = Seq(Scala_2_13, Scala_3),
+    axisValues = Seq(ScalaCheckAxis.v1_15),
+    settings = Seq(
+      libraryDependencies +=
+        ScalaCheckAxis.current.value.scalaTestPlusScalaCheck(scalaVersion.value)
+    )
+  )
+  .nativePlatform(
+    scalaVersions = Seq(Scala_2_13, Scala_3),
+    axisValues = Seq(ScalaCheckAxis.v1_16),
+    settings = Seq(
+      libraryDependencies +=
+        ScalaCheckAxis.current.value.scalaTestPlusScalaCheck(scalaVersion.value)
+    )
+  )
 
 lazy val `joda` = projectMatrix
   .settings(commonSettings(subProject = Some("joda")))
diff --git a/project/plugins.sbt b/project/plugins.sbt
index acc986c..af9554f 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -5,3 +5,5 @@ addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.0.1")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.0-M4")
 addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.9.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.11.0")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.7")