diff --git a/ChangeLog b/ChangeLog
index eeaafaea2d2eb4..350006194d2776 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri May 11 14:09:48 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/bigdecimal/bigdecimal.c (PUSH): to prevent VALUE from GC,
+	  must not cast it to unsigned long, which may be shorter than
+	  VALUE, and the result can be mere garbage.
+
 Sat Apr 14 18:00:59 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* bignum.c (rb_big2str0): prevent working clone from
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 64562edb5b8558..b3cb59def73077 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -35,7 +35,7 @@ VALUE rb_cBigDecimal;
 
 /* MACRO's to guard objects from GC by keeping them in stack */
 #define ENTER(n) volatile VALUE vStack[n];int iStack=0
-#define PUSH(x)  vStack[iStack++] = (unsigned long)(x);
+#define PUSH(x)  vStack[iStack++] = (VALUE)(x);
 #define SAVE(p)  PUSH(p->obj);
 #define GUARD_OBJ(p,y) {p=y;SAVE(p);}
 
diff --git a/version.h b/version.h
index f3c2b94f1a6355..6f4bdd4d2bc3ac 100644
--- a/version.h
+++ b/version.h
@@ -1,15 +1,15 @@
 #define RUBY_VERSION "1.8.8"
-#define RUBY_RELEASE_DATE "2012-04-14"
+#define RUBY_RELEASE_DATE "2012-05-11"
 #define RUBY_VERSION_CODE 188
-#define RUBY_RELEASE_CODE 20120414
+#define RUBY_RELEASE_CODE 20120511
 #define RUBY_PATCHLEVEL -1
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8
 #define RUBY_VERSION_TEENY 8
 #define RUBY_RELEASE_YEAR 2012
-#define RUBY_RELEASE_MONTH 4
-#define RUBY_RELEASE_DAY 14
+#define RUBY_RELEASE_MONTH 5
+#define RUBY_RELEASE_DAY 11
 
 #define NO_STRING_LITERAL_CONCATENATION 1
 #ifdef RUBY_EXTERN