diff --git a/code-samples/serving/multi-container/servingcontainer/Dockerfile b/code-samples/serving/multi-container/servingcontainer/Dockerfile
index 61fafe02c1..bb586dbc3b 100644
--- a/code-samples/serving/multi-container/servingcontainer/Dockerfile
+++ b/code-samples/serving/multi-container/servingcontainer/Dockerfile
@@ -1,7 +1,7 @@
 # Use the official Golang image to create a build artifact.
 # This is based on Debian and sets the GOPATH to /go.
 # https://hub.docker.com/_/golang
-FROM golang:1.16 as builder
+FROM golang:1.21 as builder
 
 ARG TARGETOS
 ARG TARGETARCH
diff --git a/code-samples/serving/multi-container/servingcontainer/go.mod b/code-samples/serving/multi-container/servingcontainer/go.mod
index 8ec825cae3..212c0fff80 100644
--- a/code-samples/serving/multi-container/servingcontainer/go.mod
+++ b/code-samples/serving/multi-container/servingcontainer/go.mod
@@ -1,3 +1,3 @@
 module github.com/knative/docs/code-samples/serving/multi-container/servingcontainer
 
-go 1.15
+go 1.21
diff --git a/code-samples/serving/multi-container/sidecarcontainer/Dockerfile b/code-samples/serving/multi-container/sidecarcontainer/Dockerfile
index 8a08726a4f..d03e659c81 100644
--- a/code-samples/serving/multi-container/sidecarcontainer/Dockerfile
+++ b/code-samples/serving/multi-container/sidecarcontainer/Dockerfile
@@ -1,7 +1,7 @@
 # Use the official Golang image to create a build artifact.
 # This is based on Debian and sets the GOPATH to /go.
 # https://hub.docker.com/_/golang
-FROM golang:1.16 as builder
+FROM golang:1.21 as builder
 
 ARG TARGETOS
 ARG TARGETARCH
diff --git a/code-samples/serving/multi-container/sidecarcontainer/go.mod b/code-samples/serving/multi-container/sidecarcontainer/go.mod
index 6746b2c51e..52d94ee303 100644
--- a/code-samples/serving/multi-container/sidecarcontainer/go.mod
+++ b/code-samples/serving/multi-container/sidecarcontainer/go.mod
@@ -1,3 +1,3 @@
 module github.com/knative/docs/code-samples/serving/multi-container/sidecarcontainer
 
-go 1.15
+go 1.21