diff --git a/ch9_release/src/Tailwind.Traders.Web/Dockerfile.develop b/ch9_release/src/Tailwind.Traders.Web/Dockerfile.develop
index 975a973d..f1485d8d 100644
--- a/ch9_release/src/Tailwind.Traders.Web/Dockerfile.develop
+++ b/ch9_release/src/Tailwind.Traders.Web/Dockerfile.develop
@@ -6,7 +6,7 @@ RUN npm install
 COPY ClientApp/ .
 RUN npm run build
 
-FROM mcr.microsoft.com/dotnet/sdk:6.0.101
+FROM mcr.microsoft.com/dotnet/sdk:9.0.302
 ENV BuildingDocker true
 ARG BUILD_CONFIGURATION=Debug
 ENV ASPNETCORE_ENVIRONMENT=Development