diff --git a/ChangeLog b/ChangeLog
index 5620c4ba43..8ffe86b769 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue Aug 23 03:22:34 2016  Naohisa Goto  <ngotogenome@gmail.com>
+
+	* test/fiddle/test_pointer.rb (test_to_str, test_to_s, test_aref_aset):
+	  Attempt to use independent strings for destructive tests that
+	  directly modify values on memory by using Fiddle::Pointer.
+	  [Bug #12537] [ruby-dev:49700]
+
 Tue Aug 23 03:14:22 2016  Naohisa Goto  <ngotogenome@gmail.com>
 
 	* string.c (str_buf_cat): Fix capa size for embed string.
diff --git a/test/fiddle/test_pointer.rb b/test/fiddle/test_pointer.rb
index ec677324eb..aa77c619ef 100644
--- a/test/fiddle/test_pointer.rb
+++ b/test/fiddle/test_pointer.rb
@@ -35,7 +35,7 @@ module Fiddle
     end
 
     def test_to_str
-      str = "hello world"
+      str = Marshal.load(Marshal.dump("hello world"))
       ptr = Pointer[str]
 
       assert_equal 3, ptr.to_str(3).length
@@ -46,7 +46,7 @@ module Fiddle
     end
 
     def test_to_s
-      str = "hello world"
+      str = Marshal.load(Marshal.dump("hello world"))
       ptr = Pointer[str]
 
       assert_equal 3, ptr.to_s(3).length
@@ -202,7 +202,7 @@ module Fiddle
         assert_equal(str[0].ord, ptr[0])
         assert_equal(str[1].ord, ptr[1])
       }
-      str = 'abc'
+      str = Marshal.load(Marshal.dump('abc'))
       ptr = Pointer[str]
       check.call(str, ptr)
 
diff --git a/version.h b/version.h
index 6941dd3adc..bf1ff89ab9 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.3.2"
 #define RUBY_RELEASE_DATE "2016-08-23"
-#define RUBY_PATCHLEVEL 175
+#define RUBY_PATCHLEVEL 176
 
 #define RUBY_RELEASE_YEAR 2016
 #define RUBY_RELEASE_MONTH 8