diff --git a/src/backend/server/Dockerfile b/src/backend/server/Dockerfile
index 5fa65b8..bff2a45 100644
--- a/src/backend/server/Dockerfile
+++ b/src/backend/server/Dockerfile
@@ -3,7 +3,7 @@ WORKDIR /app
 EXPOSE 80
 EXPOSE 443
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 
 COPY *.sln .