diff --git a/py/mpconfig.h b/py/mpconfig.h
index 798d4089aa..666b15573d 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -39,9 +39,9 @@
 // as well as a fallback to generate MICROPY_GIT_TAG if the git repo or tags
 // are unavailable.
 #define MICROPY_VERSION_MAJOR 1
-#define MICROPY_VERSION_MINOR 27
+#define MICROPY_VERSION_MINOR 28
 #define MICROPY_VERSION_MICRO 0
-#define MICROPY_VERSION_PRERELEASE 0
+#define MICROPY_VERSION_PRERELEASE 1
 
 // Combined version as a 32-bit number for convenience to allow version
 // comparison. Doesn't include prerelease state.