diff --git a/test/Dockerfile b/test/Dockerfile
index c9578caa9..b79e61346 100644
--- a/test/Dockerfile
+++ b/test/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 /app
 
 COPY AppLibDotnet.sln .