diff --git a/Dockerfile b/Dockerfile
old mode 100755
new mode 100644
index 1a6548b..ed2ffef
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ USER $APP_UID
 WORKDIR /app
 EXPOSE 5000
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 ARG BUILD_CONFIGURATION=Release
 WORKDIR /src
 COPY ["McpServer.Template.csproj", "./"]