diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 47f92fed44..12ed9a1a04 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,7 +20,7 @@ Argo Events is native to Kubernetes so you'll need a running Kubernetes cluster.
 ### Requirements
 - Golang 1.12
 - Docker
-- dep
+- [dep](https://golang.github.io/dep/docs/installation.html)
 
 ### Installation & Setup
 
@@ -32,6 +32,7 @@ cd $GOPATH/src/github.com/argoproj/argo-events
 
 #### 2. Vendor dependencies
 ```
+GO111MODULE=on go get github.com/cloudevents/sdk-go
 dep ensure -vendor-only
 ```
 
diff --git a/sensors/triggers/params.go b/sensors/triggers/params.go
index 02eba6fd4f..9f986b51f3 100644
--- a/sensors/triggers/params.go
+++ b/sensors/triggers/params.go
@@ -35,7 +35,7 @@ import (
 
 // ConstructPayload constructs a payload for operations involving request and responses like HTTP request.
 func ConstructPayload(sensor *v1alpha1.Sensor, parameters []v1alpha1.TriggerParameter) ([]byte, error) {
-	payload := make(map[string]string)
+	var payload []byte
 
 	events := ExtractEvents(sensor, parameters)
 	if events == nil {
@@ -47,10 +47,14 @@ func ConstructPayload(sensor *v1alpha1.Sensor, parameters []v1alpha1.TriggerPara
 		if err != nil {
 			return nil, err
 		}
-		payload[parameter.Dest] = value
+		tmp, err := sjson.SetBytes(payload, parameter.Dest, value)
+		if err != nil {
+			return nil, err
+		}
+		payload = tmp
 	}
 
-	return json.Marshal(payload)
+	return payload, nil
 }
 
 // ApplyTemplateParameters applies parameters to trigger template