diff --git a/Include/patchlevel.h b/Include/patchlevel.h
index 81973bf..3754a0a 100644
--- a/Include/patchlevel.h
+++ b/Include/patchlevel.h
@@ -22,14 +22,14 @@
 #define PY_MAJOR_VERSION	2
 #define PY_MINOR_VERSION	1
 #define PY_MICRO_VERSION	0
-#define PY_RELEASE_LEVEL	PY_RELEASE_LEVEL_ALPHA
-#define PY_RELEASE_SERIAL	2
+#define PY_RELEASE_LEVEL	PY_RELEASE_LEVEL_BETA
+#define PY_RELEASE_SERIAL	1
 
 /* Version as a string */
-#define PY_VERSION		"2.1a2"
+#define PY_VERSION		"2.1b1"
 
 /* Historic */
-#define PATCHLEVEL		"2.1a2"
+#define PATCHLEVEL		"2.1b1"
 
 /* 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 >= ... */