diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 792d7e86..f9887589 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:9.0.304-noble@sha256:1f7ccf88e076bc1cb1ddbd81959fb55b886b01851b092867bb7a638435fa1f1f
+FROM mcr.microsoft.com/dotnet/sdk:9.0.306-noble@sha256:d88e637d15248531967111fba05c6725ad45ea1dace3d35d8cfe2c4d4094e25d
 
 # 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 f8dd2c72..2338b327 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.304",
+    "version": "9.0.306",
     "rollForward": "patch",
     "allowPrerelease": false
   },