diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 05a925c..2e9e769 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,13 +12,24 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        nodejsversion: ["15"]
         scalaversion: ["2.11.12", "2.12.11", "2.13.2"]
         project: ["scalajs-js-envs", "scalajs-js-envs-test-kit", "scalajs-env-nodejs"]
+        include:
+          - nodejsversion: "16"
+            scalaversion: "2.12.11"
+            project: "scalajs-env-nodejs"
+          - nodejsversion: "17"
+            scalaversion: "2.12.11"
+            project: "scalajs-env-nodejs"
     steps:
       - uses: actions/checkout@v2
       - uses: olafurpg/setup-scala@v10
         with:
           java-version: "adopt@1.8"
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "${{ matrix.nodejsversion }}"
       - uses: coursier/cache-action@v5
       - name: Test
         run: sbt "++${{ matrix.scalaversion }}" ${{ matrix.project }}/test
diff --git a/nodejs-env/src/main/scala/org/scalajs/jsenv/nodejs/ComSupport.scala b/nodejs-env/src/main/scala/org/scalajs/jsenv/nodejs/ComSupport.scala
index 31b514f..bef71ec 100644
--- a/nodejs-env/src/main/scala/org/scalajs/jsenv/nodejs/ComSupport.scala
+++ b/nodejs-env/src/main/scala/org/scalajs/jsenv/nodejs/ComSupport.scala
@@ -209,7 +209,7 @@ object ComRun {
   def start(config: RunConfig, onMessage: String => Unit)(startRun: Path => JSRun): JSComRun = {
     try {
       val serverSocket =
-        new ServerSocket(0, 0, InetAddress.getByName(null)) // Loopback address
+        new ServerSocket(0, 0, InetAddress.getByName("127.0.0.1")) // IPv4 loopback address
 
       val run = startRun(setupFile(serverSocket.getLocalPort))
 
@@ -248,7 +248,7 @@ object ComRun {
         s"""
            |(function() {
            |  // The socket for communication
-           |  var socket = require('net').connect($port);
+           |  var socket = require('net').connect($port, '127.0.0.1'); // IPv4 loopback address
            |
            |  // Buffers received data
            |  var inBuffer = Buffer.alloc(0);