diff --git a/ruby-2.0-r36832-rb_float_value-optimization.patch b/ruby-2.0-r36832-rb_float_value-optimization.patch
new file mode 100644
index 0000000..97dc58b
--- /dev/null
+++ b/ruby-2.0-r36832-rb_float_value-optimization.patch
@@ -0,0 +1,46 @@
+From 0b89d6d5f9f8c788f4391d8a0499f10aed624371 Mon Sep 17 00:00:00 2001
+From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+Date: Mon, 27 Aug 2012 09:22:21 +0000
+Subject: [PATCH] * include/ruby/ruby.h (rb_float_value): optimize it.   This
+ technique was pointed by shinichiro.hamaji  
+ <http://shinh.skr.jp/m/?date=20120825#p02>.
+
+git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36832 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
+---
+ ChangeLog           |    6 ++++++
+ include/ruby/ruby.h |   10 +++++-----
+ 2 files changed, 11 insertions(+), 5 deletions(-)
+
+diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
+index 3905b32..b8b2267 100644
+--- a/include/ruby/ruby.h
++++ b/include/ruby/ruby.h
+@@ -733,10 +733,7 @@ struct RFloat {
+ rb_float_value(VALUE v)
+ {
+     if (FLONUM_P(v)) {
+-	if (v == (VALUE)0x8000000000000002) {
+-	    return 0.0;
+-	}
+-	else {
++	if (v != (VALUE)0x8000000000000002) { /* LIKELY */
+ 	    union {
+ 		double d;
+ 		VALUE v;
+@@ -746,9 +743,12 @@ struct RFloat {
+ 	    /* e: xx1... -> 011... */
+ 	    /*    xx0... -> 100... */
+ 	    /*      ^b63           */
+-	    t.v = RUBY_BIT_ROTR(((b63 ^ 1) << 1) | b63 | (v & ~0x03), 3);
++	    t.v = RUBY_BIT_ROTR(2 - b63 | (v & ~0x03), 3);
+ 	    return t.d;
+ 	}
++	else {
++	    return 0.0;
++	}
+     }
+     else {
+ 	return ((struct RFloat *)v)->float_value;
+-- 
+1.7.10
+
diff --git a/ruby.spec b/ruby.spec
index 7dfe04f..3e3449e 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -13,7 +13,7 @@
 
 # If revision is removed/commented out, the official release build is expected.
 # Keep the revision enabled for pre-releases from SVN.
-%global revision 36213
+%global revision 36887
 
 %global release 1
 
@@ -52,7 +52,7 @@
 %global bigdecimal_version 1.1.0
 %global io_console_version 0.3
 %global json_version 1.7.1
-%global minitest_version 3.0.0
+%global minitest_version 3.3.0
 
 %global _normalized_cpu %(echo %{_target_cpu} | sed 's/^ppc/powerpc/;s/i.86/i386/;s/sparcv./sparc/')
 
@@ -109,6 +109,10 @@ Patch12: ruby-1.9.3-mkmf-verbose.patch
 # TODO: Should be probably upstreamed with #5281.
 Patch14: ruby-2.0.0-Expand-ruby.pc-variable-by-configuration-process.patch
 
+# This patch breaks a test suite, so revert it for now.
+# https://bugs.ruby-lang.org/issues/6971
+Patch100: ruby-2.0-r36832-rb_float_value-optimization.patch
+
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 Requires: ruby(rubygems) >= %{rubygems_version}
 # Make the bigdecimal gem a runtime dependency of Ruby to avoid problems
@@ -359,6 +363,8 @@ Tcl/Tk interface for the object-oriented scripting language Ruby.
 #%%patch13 -p1
 %patch14 -p1
 
+%patch100 -p1 -R
+
 %build
 autoconf
 
@@ -581,7 +587,6 @@ make check TESTS="-v $DISABLE_TESTS"
 %{ruby_libdir}/ripper
 %{ruby_libdir}/rss
 %{ruby_libdir}/shell
-%{ruby_libdir}/syck
 %{ruby_libdir}/syslog
 %{ruby_libdir}/test
 %exclude %{ruby_libdir}/tk
@@ -690,7 +695,6 @@ make check TESTS="-v $DISABLE_TESTS"
 %{ruby_libarchdir}/socket.so
 %{ruby_libarchdir}/stringio.so
 %{ruby_libarchdir}/strscan.so
-%{ruby_libarchdir}/syck.so
 %{ruby_libarchdir}/syslog.so
 %exclude %{ruby_libarchdir}/tcltklib.so
 %exclude %{ruby_libarchdir}/tkutil.so