diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 6d2dbf45..cfa41d1f 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,5 +1,5 @@
 # Refer to https://hub.docker.com/_/microsoft-dotnet-sdk for available versions
-FROM mcr.microsoft.com/dotnet/sdk:10.0.302@sha256:72dd743782f2ae7e5476fd64f6a460045e3998dc862218b80e6944cba79a01b0
+FROM mcr.microsoft.com/dotnet/sdk:10.0.400@sha256:e1fc6e423f543119c406d24e2e687d67c569f18f04a37a8b0005d80ad0dcee80
 
 # Installing mono makes `dotnet test` work without errors even for net472.
 # But installing it takes a long time, so it's excluded by default.
diff --git a/global.json b/global.json
index dba80e90..d0cca713 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "10.0.302",
+    "version": "10.0.400",
     "rollForward": "patch",
     "allowPrerelease": false
   },