diff --git a/README.md b/README.md
index 6241140..ea223f0 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,9 @@ var_dump($new_time == time()); // bool(false)
 
 ## CHANGELOG
 
+### version 1.2.1(alpha), 2016/12/30
+- Fixed the year 2038 problem for PHP 7.x on Windows.
+
 ### version 1.2.0(alpha), 2016/12/30
 - Big internal change (without BC break): handle microseconds accurately in time traveling.
 - Now `timecop_freeze()` and `timecop_travel()` accepts either `DateTimeInterface` or `int`.
diff --git a/php-timecop.spec b/php-timecop.spec
index 8b19afc..2e6be25 100644
--- a/php-timecop.spec
+++ b/php-timecop.spec
@@ -1,6 +1,6 @@
 %define __ext_name timecop
 Name:		php-%{__ext_name}
-Version:	1.2.0
+Version:	1.2.1
 Release:	1%{?dist}
 Summary:	php-timecop module
 
diff --git a/php_timecop.h b/php_timecop.h
index a335027..93c20ce 100644
--- a/php_timecop.h
+++ b/php_timecop.h
@@ -15,7 +15,7 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 #ifndef PHP_TIMECOP_H
 #define PHP_TIMECOP_H
 
-#define PHP_TIMECOP_VERSION "1.2.0"
+#define PHP_TIMECOP_VERSION "1.2.1"
 
 extern zend_module_entry timecop_module_entry;
 #define phpext_timecop_ptr &timecop_module_entry