diff --git a/app/script/runner_integration_test.go b/app/script/runner_integration_test.go
index 6eba448..ab33ba7 100644
--- a/app/script/runner_integration_test.go
+++ b/app/script/runner_integration_test.go
@@ -391,7 +391,9 @@ func TestRunnerIntegration(t *testing.T) {
 		Convey("runs async scripts", func() {
 			var tests = []scriptTest{
 				{"nodejs_v8", `exports.default = (ctx) => { ctx.log('codebox'); abrakadabra }`},
+				{"nodejs_v8", `exports.default = async (ctx) => { ctx.log('codebox'); abrakadabra }`},
 				{"nodejs_v12", `exports.default = (ctx) => { ctx.log('codebox'); abrakadabra }`},
+				{"nodejs_v12", `exports.default = async (ctx) => { ctx.log('codebox'); abrakadabra }`},
 			}
 			for _, data := range tests {
 				hash := util.GenerateKey()
diff --git a/assets/assets.go b/assets/assets.go
index f9ac2ff..3c28420 100644
--- a/assets/assets.go
+++ b/assets/assets.go
@@ -1,6 +1,6 @@
 // Code generated by go-bindata. DO NOT EDIT.
 // sources:
-// assets/wrappers/node.js (10.576kB)
+// assets/wrappers/node.js (10.602kB)
 
 package assets
 
@@ -59,7 +59,7 @@ func (fi bindataFileInfo) Sys() interface{} {
 	return nil
 }
 
-var _wrappersNodeJs = 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+var _wrappersNodeJs = 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
 func wrappersNodeJsBytes() ([]byte, error) {
 	return bindataRead(
@@ -75,7 +75,7 @@ func wrappersNodeJs() (*asset, error) {
 	}
 
 	info := bindataFileInfo{name: "wrappers/node.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
-	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0x1f, 0xe7, 0x7e, 0xd9, 0x40, 0x16, 0x29, 0x36, 0x10, 0xa8, 0x36, 0x40, 0x0, 0x39, 0x9e, 0x63, 0xae, 0x99, 0xfa, 0x6, 0xc9, 0xf9, 0xd8, 0xf7, 0x48, 0x23, 0x92, 0x75, 0x32, 0x8e, 0x4e, 0x4b}}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0x3b, 0x5e, 0xfe, 0x1d, 0xb5, 0x85, 0x91, 0x6d, 0x74, 0x74, 0xb3, 0x27, 0xad, 0xdd, 0xd, 0xcc, 0x95, 0xdd, 0xa1, 0x40, 0x9a, 0x4b, 0x62, 0xe9, 0x63, 0x5a, 0x27, 0xf4, 0x80, 0xd1, 0x38, 0x84}}
 	return a, nil
 }
 
diff --git a/assets/wrappers/node.js b/assets/wrappers/node.js
index 4c8f9ba..cc686e4 100644
--- a/assets/wrappers/node.js
+++ b/assets/wrappers/node.js
@@ -34,6 +34,7 @@ const SCRIPT_FUNC = new vm.Script(`
 
   __f.catch(function (error) {
     __conn.handleError(error)
+    __conn.sendResponse()
   })
 
   __f.then(function (r) {
diff --git a/deploy/yaml/broker-hpa.yml.j2 b/deploy/yaml/broker-hpa.yml.j2
index 73a2a6f..5e1e5ad 100644
--- a/deploy/yaml/broker-hpa.yml.j2
+++ b/deploy/yaml/broker-hpa.yml.j2
@@ -1,12 +1,18 @@
+apiVersion: autoscaling/v2beta2
 kind: HorizontalPodAutoscaler
-apiVersion: autoscaling/v1
 metadata:
   name: codebox-broker
 spec:
-  minReplicas: {{ BROKER_MIN }}
-  maxReplicas: {{ BROKER_MAX }}
   scaleTargetRef:
     apiVersion: apps/v1
     kind: Deployment
     name: codebox-broker
-  targetCPUUtilizationPercentage: 80
+  minReplicas: {{ BROKER_MIN }}
+  maxReplicas: {{ BROKER_MAX }}
+  metrics:
+    - type: Resource
+      resource:
+        name: cpu
+        target:
+          type: Utilization
+          averageUtilization: 80