diff --git a/nginx-aspnet-mysql/backend/Dockerfile b/nginx-aspnet-mysql/backend/Dockerfile
index c565dda..37f0d72 100755
--- a/nginx-aspnet-mysql/backend/Dockerfile
+++ b/nginx-aspnet-mysql/backend/Dockerfile
@@ -34,7 +34,7 @@ FROM builder AS publisher
 
 RUN ["dotnet", "publish", "-c", "Release", "-o", "/build"]
 
-FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/aspnet:6.0
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/aspnet:6.0@sha256:3edfb4ea7067e24b3aa5c6ab585e85a26c7daabfec26829b8efabeb122de4364
 
 WORKDIR /app
 COPY --from=publisher /build .