diff --git a/tools/VERSION b/tools/VERSION
index 4cf53fd..c041bdd 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -34,6 +34,6 @@
 MINOR 9
 PATCH 0
 PRERELEASE 21
-PRERELEASE_PATCH 2
+PRERELEASE_PATCH 4
 ABI_VERSION 38
 OLDEST_SUPPORTED_ABI_VERSION 38