diff --git a/docker/file-service.Dockerfile b/docker/file-service.Dockerfile
index 9c5d858a..25f21678 100644
--- a/docker/file-service.Dockerfile
+++ b/docker/file-service.Dockerfile
@@ -1,5 +1,5 @@
 # ====== Build stage ======
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 
 COPY FileService/FileService.Core/FileService.Core.csproj FileService.Core/