diff --git a/Dockerfile.backend b/Dockerfile.backend
index 7353ad3..69f90b0 100644
--- a/Dockerfile.backend
+++ b/Dockerfile.backend
@@ -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 ["Foxnouns.Backend/Foxnouns.Backend.csproj", "Foxnouns.Backend/"]