diff --git a/Dockerfile b/Dockerfile
index 677db87..19e335f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:6.0-bookworm-slim AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0-bookworm-slim AS build
 WORKDIR /app
 
 # Separate layers here to avoid redoing dependencies on code change.