diff --git a/pkgs/base/info.rkt b/pkgs/base/info.rkt
index 69f2430022..1fbe764dc8 100644
--- a/pkgs/base/info.rkt
+++ b/pkgs/base/info.rkt
@@ -12,7 +12,7 @@
 
 (define collection 'multi)
 
-(define version "6.5.0.8")
+(define version "6.6.0.1")
 
 (define deps `("racket-lib"
                ["racket" #:version ,version]))
diff --git a/racket/src/racket/src/schvers.h b/racket/src/racket/src/schvers.h
index a1e963bfdd..0bc85ea01c 100644
--- a/racket/src/racket/src/schvers.h
+++ b/racket/src/racket/src/schvers.h
@@ -13,12 +13,12 @@
    consistently.)
 */
 
-#define MZSCHEME_VERSION "6.5.0.8"
+#define MZSCHEME_VERSION "6.6.0.1"
 
 #define MZSCHEME_VERSION_X 6
-#define MZSCHEME_VERSION_Y 5
+#define MZSCHEME_VERSION_Y 6
 #define MZSCHEME_VERSION_Z 0
-#define MZSCHEME_VERSION_W 8
+#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)