diff --git a/schema/staticwebapp.config.json b/schema/staticwebapp.config.json
index 38ef41e7..0dd24269 100644
--- a/schema/staticwebapp.config.json
+++ b/schema/staticwebapp.config.json
@@ -590,6 +590,7 @@
             "dotnet-isolated:6.0",
             "dotnet-isolated:7.0",
             "dotnet-isolated:8.0",
+            "dotnet-isolated:9.0",
             "node:12",
             "node:14",
             "node:16",