diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1fdf87..cfc819f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.3.1-SNAPSHOT - 2023-05-19
+## 0.3.1 - 2023-05-19
 * [enhancement] Update library, minor code refactoring
 * PR [#78](https://github.com/treasure-data/embulk-input-jira/pull/78)
 
diff --git a/build.gradle b/build.gradle
index a9cb0b4..70213e3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,7 +12,7 @@ repositories {
     mavenCentral()
 }
 
-version = "0.3.1-SNAPSHOT"
+version = "0.3.1"
 group = "com.treasuredata.embulk.plugins"
 description = "JIRA Embulk input plugin."