diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 21cc825dd..3f8012326 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macOS-latest, windows-latest, ubuntu-latest]
-        node-version: [14, 16, 18, 19]
+        node-version: [14, 16, 18, 19, 20]
     steps:
       - name: Check out repo
         uses: actions/checkout@v3
diff --git a/browser.js b/browser.js
index 8a721660d..de46bf0b4 100644
--- a/browser.js
+++ b/browser.js
@@ -13,7 +13,8 @@ const stdSerializers = {
   wrapErrorSerializer: passthrough,
   req: mock,
   res: mock,
-  err: asErrValue
+  err: asErrValue,
+  errWithCause: asErrValue
 }
 
 function shouldSerialize (serialize, serializers) {