diff --git a/include/v8-version.h b/include/v8-version.h
index 13c3751201c..7f1ca223de3 100644
--- a/include/v8-version.h
+++ b/include/v8-version.h
@@ -9,7 +9,7 @@
 // NOTE these macros are used by some of the tool scripts and the build
 // system so their names cannot be changed without changing the scripts.
 #define V8_MAJOR_VERSION 15
-#define V8_MINOR_VERSION 8
+#define V8_MINOR_VERSION 9
 #define V8_BUILD_NUMBER 0
 #define V8_PATCH_LEVEL 0