Change the version to 2.2a0. This may look strange, but indicates
it's 2.2 before the first alpha release.
diff --git a/Include/patchlevel.h b/Include/patchlevel.h
index f114bae..dddc28f 100644
--- a/Include/patchlevel.h
+++ b/Include/patchlevel.h
@@ -20,16 +20,16 @@
/* Version parsed out into numeric values */
#define PY_MAJOR_VERSION 2
-#define PY_MINOR_VERSION 1
+#define PY_MINOR_VERSION 2
#define PY_MICRO_VERSION 0
-#define PY_RELEASE_LEVEL PY_RELEASE_LEVEL_FINAL
+#define PY_RELEASE_LEVEL PY_RELEASE_LEVEL_ALPHA
#define PY_RELEASE_SERIAL 0
/* Version as a string */
-#define PY_VERSION "2.1"
+#define PY_VERSION "2.2a0"
/* Historic */
-#define PATCHLEVEL "2.1"
+#define PATCHLEVEL "2.2a0"
/* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.
Use this for numeric comparisons, e.g. #if PY_VERSION_HEX >= ... */