diff --git a/bin/internal/dart-sdk.version b/bin/internal/dart-sdk.version
index 5de4084d7ef..bdad9b00490 100644
--- a/bin/internal/dart-sdk.version
+++ b/bin/internal/dart-sdk.version
@@ -1 +1 @@
-1.21.0-dev.9.0
+1.21.0-dev.10.0