diff --git a/envoy.Dockerfile b/envoy.Dockerfile
index 3962a8c..2c8615f 100644
--- a/envoy.Dockerfile
+++ b/envoy.Dockerfile
@@ -1,2 +1,2 @@
-FROM istio/proxyv2:1.12.0-rc.1
+FROM istio/proxyv2:1.13.8
 ENTRYPOINT /usr/local/bin/envoy -c /etc/envoy.yaml -l debug --service-cluster proxy 
diff --git a/upstream/Dockerfile b/upstream/Dockerfile
index 077f426..4e51431 100644
--- a/upstream/Dockerfile
+++ b/upstream/Dockerfile
@@ -1,4 +1,6 @@
-FROM golang:1.13.5 as bd
+# syntax=docker/dockerfile:1
+
+FROM golang:1.19.1 as bd
 WORKDIR /github.com/layer5io/wasm-upstream
 ADD . .
 RUN GOPROXY=direct GOSUMDB=off go build -a -o /upstream .
diff --git a/upstream/go.mod b/upstream/go.mod
new file mode 100644
index 0000000..b4fec42
--- /dev/null
+++ b/upstream/go.mod
@@ -0,0 +1,3 @@
+module github.com/layer5io/wasm-filters/upstream
+
+go 1.19
diff --git a/upstream/main.go b/upstream/main.go
index cbbda9f..ae3fd62 100644
--- a/upstream/main.go
+++ b/upstream/main.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 )
 
@@ -10,7 +10,7 @@ var gldata = ""
 
 func store(w http.ResponseWriter, req *http.Request) {
 	defer req.Body.Close()
-	data, err := ioutil.ReadAll(req.Body)
+	data, err := io.ReadAll(req.Body)
 	if err != nil {
 		return
 	}