diff --git include/ruby/version.h include/ruby/version.h
index 458efff..b41b64f 100644
--- include/ruby/version.h
+++ include/ruby/version.h
@@ -30,9 +30,9 @@
 #define RUBY_BIRTH_DAY 24
 
 /* API version */
-#define RUBY_API_VERSION_MAJOR 1
-#define RUBY_API_VERSION_MINOR 9
-#define RUBY_API_VERSION_TEENY 1
+#define RUBY_API_VERSION_MAJOR 2
+#define RUBY_API_VERSION_MINOR 0
+#define RUBY_API_VERSION_TEENY 0
 #define RUBY_API_VERSION_CODE (RUBY_API_VERSION_MAJOR*10000+RUBY_API_VERSION_MINOR*100+RUBY_API_VERSION_TEENY)
 
 #ifdef RUBY_EXTERN