diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c60ca33..1f7b731 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,7 +9,24 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [18, 20, 22, 24]
+        node-version: [18, 20, 22]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+      - name: Setup Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install
+        run: npm install
+      - name: Test / Lint / Codestyle
+        run: make all
+  test-optional:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [24]
     steps:
       - name: Checkout
         uses: actions/checkout@v5
diff --git a/lib/baseClasses/HttpError.js b/lib/baseClasses/HttpError.js
index 106ae2e..d5f0428 100644
--- a/lib/baseClasses/HttpError.js
+++ b/lib/baseClasses/HttpError.js
@@ -159,7 +159,8 @@ HttpError.prototype.toJSON = function toJSON() {
 
     return {
         code: self.body.code,
-        message: message
+        message: message,
+        cause: self.cause
     };
 };
 
diff --git a/package.json b/package.json
index 0721752..1e6b0e9 100644
--- a/package.json
+++ b/package.json
@@ -44,8 +44,8 @@
     "mkdirp": "^0.5.1",
     "mocha": "^6.2.2",
     "nyc": "^14.1.1",
-    "restify": "^8.5.0",
-    "restify-clients": "^2.6.7",
+    "restify": "^11.1.0",
+    "restify-clients": "^4.2.0",
     "unleash": "^2.0.1"
   },
   "optionalDependencies": {