diff --git a/samples/dotnetcore.md b/samples/dotnetcore.md
index ae398b8491..8ea87c541d 100644
--- a/samples/dotnetcore.md
+++ b/samples/dotnetcore.md
@@ -47,7 +47,7 @@ clone our [ASP.NET Docker Sample](https://github.com/dotnet/dotnet-docker/tree/m
 
 ```dockerfile
 # syntax=docker/dockerfile:1
-FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build-env
+FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build-env
 WORKDIR /app
 
 # Copy csproj and restore as distinct layers
@@ -59,7 +59,7 @@ COPY ../engine/examples ./
 RUN dotnet publish -c Release -o out
 
 # Build runtime image
-FROM mcr.microsoft.com/dotnet/aspnet:3.1
+FROM mcr.microsoft.com/dotnet/aspnet:6.0
 WORKDIR /app
 COPY --from=build-env /app/out .
 ENTRYPOINT ["dotnet", "aspnetapp.dll"]