diff --git a/CHANGES.md b/CHANGES.md
index 7232bf7..7ebd0e9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -12,6 +12,11 @@
 
 ## develop
 
+## 2023.2.1
+
+- [FIX] Version 上げ忘れを修正
+    - @haruyama
+
 ## 2023.2.0
 
 - [UPDATE] 依存ライブラリの更新
diff --git a/src/version.cpp b/src/version.cpp
index 60e52e4..586d9e1 100644
--- a/src/version.cpp
+++ b/src/version.cpp
@@ -8,7 +8,7 @@
 namespace shiguredo::mp4 {
 
 std::string get_version_string() {
-  return "2023.1.1";
+  return "2023.2.1";
 }
 
 }  // namespace shiguredo::mp4
diff --git a/test/version.cpp b/test/version.cpp
index c6e2fab..52073e4 100644
--- a/test/version.cpp
+++ b/test/version.cpp
@@ -7,7 +7,7 @@
 BOOST_AUTO_TEST_SUITE(version)
 
 BOOST_AUTO_TEST_CASE(version_string) {
-  BOOST_REQUIRE_EQUAL("2023.1.1", shiguredo::mp4::get_version_string());
+  BOOST_REQUIRE_EQUAL("2023.2.1", shiguredo::mp4::get_version_string());
 }
 
 BOOST_AUTO_TEST_SUITE_END()