diff --git a/DESCRIPTION b/DESCRIPTION
index 10e87f3..0f69a96 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: zipangu
 Title: Japanese Utility Functions and Data
-Version: 0.3.0.9000
+Version: 0.3.1
 Authors@R: 
     c(person(given = "Shinya",
              family = "Uryu",
diff --git a/NEWS.md b/NEWS.md
index 6a84c51..a1cff8d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,13 +1,13 @@
-# zipangu (development version)
+# zipangu 0.3.1
 
 ## New Features
 
-- `convert_prefecture()`: New functions for converting prefecture names between Roman and Kanji (#48).
-- `convert_prefecture_from_kana()`: New functions for converting prefecture names from kana to Kanji (#48).
+- `convert_prefecture()`: New functions for converting prefecture names between Roman and Kanji (@Doubt-0KB, #48).
+- `convert_prefecture_from_kana()`: New functions for converting prefecture names from kana to Kanji (@Doubt-0KB, #48).
 
 ## Enhancement
 
-- Refactored `convert_jyear()` and `convert_jdate()` (@paithiov909, #50).
+- Re-factoring `convert_jyear()` and `convert_jdate()` (@paithiov909, #50).
 
 # zipangu 0.3.0