diff --git a/eng/common/testproxy/docker-start-proxy.ps1 b/eng/common/testproxy/docker-start-proxy.ps1
index c15fc37a7..c34c9d38d 100644
--- a/eng/common/testproxy/docker-start-proxy.ps1
+++ b/eng/common/testproxy/docker-start-proxy.ps1
@@ -38,8 +38,7 @@ catch {
 
 $SELECTED_IMAGE_TAG = $(Get-Content "$PSScriptRoot/target_version.txt" -Raw).Trim()
 $CONTAINER_NAME = "ambitious_azsdk_test_proxy"
-$LINUX_IMAGE_SOURCE = "azsdkengsys.azurecr.io/engsys/testproxy-lin:${SELECTED_IMAGE_TAG}"
-$WINDOWS_IMAGE_SOURCE = "azsdkengsys.azurecr.io/engsys/testproxy-win:${SELECTED_IMAGE_TAG}"
+$IMAGE_SOURCE = "azsdkengsys.azurecr.io/engsys/testproxy:${SELECTED_IMAGE_TAG}"
 
 if($VersionOverride) { 
     Write-Host "Overriding default target proxy version of '$SELECTED_IMAGE_TAG' with override $VersionOverride."
@@ -58,8 +57,6 @@ function Get-Proxy-Container(){
                 | Select-Object -First 1)
 }
 
-
-$SelectedImage = $LINUX_IMAGE_SOURCE
 $Initial = ""
 $AdditionalContainerArgs = "--add-host=host.docker.internal:host-gateway"
 
@@ -67,7 +64,6 @@ $AdditionalContainerArgs = "--add-host=host.docker.internal:host-gateway"
 # however, in CI, windows images default to _windows_ containers. We cannot swap them. We can tell if we're in a CI build by
 # checking for the environment variable TF_BUILD.
 if ($IsWindows -and $env:TF_BUILD){
-    $SelectedImage = $WINDOWS_IMAGE_SOURCE
     $Initial = "C:"
     $AdditionalContainerArgs = ""
 }
@@ -93,9 +89,9 @@ if ($Mode -eq "start"){
     else {
         $attempts = 0
         Write-Host "Attempting creation of Docker host $CONTAINER_NAME"
-        Write-Host "docker container create -v `"${root}:${Initial}/srv/testproxy`" $AdditionalContainerArgs -p 5001:5001 -p 5000:5000 --name $CONTAINER_NAME $SelectedImage"
+        Write-Host "docker container create -v `"${root}:${Initial}/srv/testproxy`" $AdditionalContainerArgs -p 5001:5001 -p 5000:5000 --name $CONTAINER_NAME $IMAGE_SOURCE"
         while($attempts -lt 3){
-            docker container create -v "${root}:${Initial}/srv/testproxy" $AdditionalContainerArgs -p 5001:5001 -p 5000:5000 --name $CONTAINER_NAME $SelectedImage
+            docker container create -v "${root}:${Initial}/srv/testproxy" $AdditionalContainerArgs -p 5001:5001 -p 5000:5000 --name $CONTAINER_NAME $IMAGE_SOURCE
 
             if($LASTEXITCODE -ne 0){
                 $attempts += 1
diff --git a/eng/common/testproxy/target_version.txt b/eng/common/testproxy/target_version.txt
index ac34389c6..a72b151d9 100644
--- a/eng/common/testproxy/target_version.txt
+++ b/eng/common/testproxy/target_version.txt
@@ -1 +1 @@
-1.0.0-dev.20220224.2
+1.0.0-dev.20220426.1
diff --git a/tools/test-proxy/docker/README.md b/tools/test-proxy/docker/README.md
index 0e8d82eab..ff2f0f249 100644
--- a/tools/test-proxy/docker/README.md
+++ b/tools/test-proxy/docker/README.md
@@ -67,7 +67,7 @@ Most issues we've seen are related to having a prior `az acr login` or the like.
 
 If your error looks something like this:
 
-```
+```bash
 > docker pull azsdkengsys.azurecr.io/engsys/testproxy-lin:latest
 Error response from daemon: Head https://azsdkengsys.azurecr.io/v2/engsys/testproxy-lin/manifests/latest: unauthorized: authentication required
 ```
@@ -82,7 +82,7 @@ This occurs when a user has a **prior login** to `azsdkengsys.azurecr.io`. `az a
 
 For errors that look like:
 
-```
+```bash
 > docker pull azsdkengsys.azurecr.io/engsys/testproxy-lin:latest
 Error response from daemon: Get https://azsdkengsys.azurecr.io/v2/: x509: certificate has expired or is not yet valid
 ```
@@ -99,7 +99,7 @@ To build the `arm64` version of the linux image, simply provide a build time arg
 
 ```pwsh
 ./prepare.ps1
-docker build -t testproxy --build-arg ARCH=-arm64v8 .
+docker build -t testproxy --build-arg ARCH=-arm64v8 . --platform linux/arm64
 ```
 
 ## Publishing a multiplatform image