diff --git a/docker/container-matrix/Middleware-alpine.dockerfile b/docker/container-matrix/Middleware-alpine.dockerfile
index 9c15adf47..6fac2aa77 100644
--- a/docker/container-matrix/Middleware-alpine.dockerfile
+++ b/docker/container-matrix/Middleware-alpine.dockerfile
@@ -3,7 +3,7 @@ WORKDIR /app
 COPY . .
 RUN dotnet publish src/Benchmarks/Benchmarks.csproj -c Release -o out -f net9.0 -p:BenchmarksTargetFramework=net9.0 -p:MicrosoftAspNetCoreAppPackageVersion=$ASPNET_VERSION
 
-FROM mcr.microsoft.com/dotnet/nightly/aspnet:9.0-alpine AS runtime
+FROM mcr.microsoft.com/dotnet/nightly/aspnet:9.0-preview-alpine AS runtime
 WORKDIR /app
 COPY --from=build /app/out ./
 
diff --git a/docker/container-matrix/Middleware-composite.dockerfile b/docker/container-matrix/Middleware-composite.dockerfile
index dc6d2270c..90e418ea2 100644
--- a/docker/container-matrix/Middleware-composite.dockerfile
+++ b/docker/container-matrix/Middleware-composite.dockerfile
@@ -3,7 +3,7 @@ WORKDIR /app
 COPY . .
 RUN dotnet publish src/Benchmarks/Benchmarks.csproj -c Release -o out -f net9.0 -p:BenchmarksTargetFramework=net9.0 -p:MicrosoftAspNetCoreAppPackageVersion=$ASPNET_VERSION
 
-FROM mcr.microsoft.com/dotnet/nightly/aspnet:9.0-alpine-composite AS runtime
+FROM mcr.microsoft.com/dotnet/nightly/aspnet:9.0-preview-alpine-composite AS runtime
 WORKDIR /app
 COPY --from=build /app/out ./