diff --git a/content/en/examples/Dotnet/dotnetwebapp/Dockerfile b/content/en/examples/Dotnet/dotnetwebapp/Dockerfile
index 2039da4786..13bac0effa 100644
--- a/content/en/examples/Dotnet/dotnetwebapp/Dockerfile
+++ b/content/en/examples/Dotnet/dotnetwebapp/Dockerfile
@@ -1,10 +1,10 @@
-FROM mcr.microsoft.com/dotnet/sdk as build
+FROM mcr.microsoft.com/dotnet/sdk:latest@sha256:2fdad630a59fbdecbfcc6aaf3ccae96eea0e8d24cd4607669fde0de107a94c53 as build
 COPY . ./src
 WORKDIR /src
 RUN dotnet build -o /app
 RUN dotnet publish -o /publish
 
-FROM mcr.microsoft.com/dotnet/aspnet as base
+FROM mcr.microsoft.com/dotnet/aspnet:latest@sha256:99d7ef1ce989ace31dfef826a3e702606f19774665acd1d00cd3d29f3e6e3149 as base
 COPY --from=build  /publish /app
 WORKDIR /app
 EXPOSE 80