diff --git a/playground/withdockerfile/WithDockerfile.AppHost/Program.cs b/playground/withdockerfile/WithDockerfile.AppHost/Program.cs
index 89359eb2a38..9b62ee945d6 100644
--- a/playground/withdockerfile/WithDockerfile.AppHost/Program.cs
+++ b/playground/withdockerfile/WithDockerfile.AppHost/Program.cs
@@ -22,13 +22,13 @@
     {
         var timestamp = DateTime.Now.ToString("yyyyMMddHHmmss", System.Globalization.CultureInfo.InvariantCulture);
         return $"""
-            FROM golang:1.22-alpine AS builder
+            FROM mcr.microsoft.com/oss/go/microsoft/golang:1.23 AS builder
             WORKDIR /app
             COPY . .
             RUN echo "Built at {timestamp}" > /build-info.txt
             RUN go build -o qots .
             
-            FROM alpine:latest
+            FROM mcr.microsoft.com/cbl-mariner/base/core:2.0
             COPY --from=builder /app/qots /qots
             COPY --from=builder /build-info.txt /build-info.txt
             ENTRYPOINT ["/qots"]
@@ -41,20 +41,21 @@ ENTRYPOINT ["/qots"]
     {
         // Simulate reading from a template or external source
         await Task.Delay(1, context.CancellationToken);
-        var baseImage = Environment.GetEnvironmentVariable("BASE_IMAGE") ?? "golang:1.22-alpine";
+        var baseImage = Environment.GetEnvironmentVariable("BASE_IMAGE") ?? "mcr.microsoft.com/oss/go/microsoft/golang:1.23";
         return $"""
             FROM {baseImage} AS builder
             WORKDIR /app
             COPY . .
             RUN go build -o qots .
             
-            FROM alpine:latest
+            FROM mcr.microsoft.com/cbl-mariner/base/core:2.0
             COPY --from=builder /app/qots /qots
             ENTRYPOINT ["/qots"]
             """;
     });
 
 builder.AddRedis("builder-sync")
+    .WithImageRegistry("netaspireci.azurecr.io")
     .WithDockerfileBuilder(".", context =>
     {
         if (!context.Resource.TryGetContainerImageName(useBuiltImage: false, out var imageName))
@@ -66,6 +67,7 @@ ENTRYPOINT ["/qots"]
     });
 
 builder.AddRedis("builder-async")
+    .WithImageRegistry("netaspireci.azurecr.io")
     .WithDockerfileBuilder(".", async context =>
     {
         await Task.Delay(1, context.CancellationToken);