diff --git a/Dev.Dockerfile b/Dev.Dockerfile
index 1fd3259..1517e66 100644
--- a/Dev.Dockerfile
+++ b/Dev.Dockerfile
@@ -6,7 +6,7 @@ EXPOSE 443
 ENV TZ=Asia/Shanghai
 ENV ASPNETCORE_ENVIRONMENT=Development
 
-FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0.308 AS build
 COPY ["JiShe.IoT.Admin.sln", "."]
 COPY ["Directory.Build.JiShe.targets", "."]
 COPY ["Directory.Build.Microsoft.targets", "."]