diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index f9887589..b90b3306 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:9.0.306-noble@sha256:d88e637d15248531967111fba05c6725ad45ea1dace3d35d8cfe2c4d4094e25d
+FROM mcr.microsoft.com/dotnet/sdk:9.0.308-noble@sha256:7331fb5fb8798c58df1f263dc8cc843459965c00cfb29ebeb53bf4cc572d592d
 
 # 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 cfaecd0d..8a3e0093 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.306",
+    "version": "9.0.308",
     "rollForward": "patch",
     "allowPrerelease": false
   }