diff --git a/etc/azure/Dockerfile.base b/etc/azure/Dockerfile.base
index 5b67d38..3655948 100644
--- a/etc/azure/Dockerfile.base
+++ b/etc/azure/Dockerfile.base
@@ -1,3 +1,3 @@
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /app
 COPY . .
\ No newline at end of file