diff --git a/CHANGELOG-Japanese.md b/CHANGELOG-Japanese.md
index 39e5a405..f3eee509 100644
--- a/CHANGELOG-Japanese.md
+++ b/CHANGELOG-Japanese.md
@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## 3.0.0 [2026/09/23] - Release
+## 3.0.0 [2026/xx/xx] - Dev Release
 
 - 公開 WELA リリースを 3.0.0 に更新し、ASCII バナー直後にバージョンとリリース情報を明示表示します。互換性のため、過去のプロファイル識別子は変更しません。
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec33d253..7d5ccf2c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## 3.0.0 [2026/09/23] - Release
+## 3.0.0 [2026/xx/xx] - Dev Release
 
 - Set the public WELA release version to 3.0.0 and print explicit version and release information immediately after the ASCII banner. Historical profile identifiers remain unchanged for compatibility.
 
diff --git a/WELA.ps1 b/WELA.ps1
index c54dac04..e8866f10 100644
--- a/WELA.ps1
+++ b/WELA.ps1
@@ -262,7 +262,7 @@
 )
 
 $WELAVersion     = "3.0.0"
-$WELAReleaseName = "Release"
+$WELAReleaseName = "Dev Release"
 
 # 実行時のカレントディレクトリに依存しないよう、すべてスクリプトの場所を基準にする
 $ScriptRoot = if ($PSScriptRoot) { $PSScriptRoot } else { (Get-Location).Path }
diff --git a/website/docs/resources/changelog.ja.md b/website/docs/resources/changelog.ja.md
index 6fc6a151..3fd51f26 100644
--- a/website/docs/resources/changelog.ja.md
+++ b/website/docs/resources/changelog.ja.md
@@ -3,7 +3,7 @@
 !!! info "情報"
     このページはプロジェクトの [`CHANGELOG.md`](https://github.com/Yamato-Security/WELA/blob/main/CHANGELOG-Japanese.md) を反映したものです。ダウンロードは [リリースページ](https://github.com/Yamato-Security/WELA/releases) をご覧ください。
 
-## 3.0.0 [2026/09/23] - Release
+## 3.0.0 [2026/xx/xx] - Dev Release
 
 - 公開 WELA リリースを 3.0.0 に更新し、ASCII バナー直後にバージョンとリリース情報を明示表示します。互換性のため、過去のプロファイル識別子は変更しません。
 
diff --git a/website/docs/resources/changelog.md b/website/docs/resources/changelog.md
index c49bdf69..aa47e6eb 100644
--- a/website/docs/resources/changelog.md
+++ b/website/docs/resources/changelog.md
@@ -3,7 +3,7 @@
 !!! info
     This page mirrors the project [`CHANGELOG.md`](https://github.com/Yamato-Security/WELA/blob/main/CHANGELOG.md). See the [Releases page](https://github.com/Yamato-Security/WELA/releases) for downloads.
 
-## 3.0.0 [2026/09/23] - Release
+## 3.0.0 [2026/xx/xx] - Dev Release
 
 - Set the public WELA release version to 3.0.0 and print explicit version and release information immediately after the ASCII banner. Historical profile identifiers remain unchanged for compatibility.