diff --git a/src/racket/src/schvers.h b/src/racket/src/schvers.h
index 287f1dfd9a..bd5e0afe30 100644
--- a/src/racket/src/schvers.h
+++ b/src/racket/src/schvers.h
@@ -13,12 +13,12 @@
    consistently.)
 */
 
-#define MZSCHEME_VERSION "5.1.1.9"
+#define MZSCHEME_VERSION "5.1.2.1"
 
 #define MZSCHEME_VERSION_X 5
 #define MZSCHEME_VERSION_Y 1
-#define MZSCHEME_VERSION_Z 1
-#define MZSCHEME_VERSION_W 9
+#define MZSCHEME_VERSION_Z 2
+#define MZSCHEME_VERSION_W 1
 
 #define MZSCHEME_VERSION_MAJOR ((MZSCHEME_VERSION_X * 100) + MZSCHEME_VERSION_Y)
 #define MZSCHEME_VERSION_MINOR ((MZSCHEME_VERSION_Z * 1000) + MZSCHEME_VERSION_W)