diff --git a/Applications/Editor/Main/Cube.Pdf.Editor.csproj b/Applications/Editor/Main/Cube.Pdf.Editor.csproj
index 35019a6c..c51ad70d 100644
--- a/Applications/Editor/Main/Cube.Pdf.Editor.csproj
+++ b/Applications/Editor/Main/Cube.Pdf.Editor.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <Version>2.6.2</Version>
+        <Version>3.0.0</Version>
         <Authors>clown;cube-soft</Authors>
         <Company>CubeSoft</Company>
         <Product>CubePdfUtility</Product>
diff --git a/Applications/Editor/Readme.ja.md b/Applications/Editor/Readme.ja.md
index e651efa1..93f4708c 100644
--- a/Applications/Editor/Readme.ja.md
+++ b/Applications/Editor/Readme.ja.md
@@ -125,6 +125,9 @@ CubePDF Utility は、以下のライブラリを利用しています。
 
 ## バージョン履歴
 
+* 2024-04-03 version 3.0.0
+    - バックアップ機能に関する不具合を修正
+    - 古いバックアップファイルの自動削除機能に関する設定を追加
 * 2024-03-22 version 2.6.2
     - PDFium を Chromium 123 相当に更新
 * 2024-02-22 version 2.6.1
diff --git a/Applications/Editor/Readme.md b/Applications/Editor/Readme.md
index 022f6c4f..2bdea87f 100644
--- a/Applications/Editor/Readme.md
+++ b/Applications/Editor/Readme.md
@@ -119,6 +119,9 @@ Dependencies of the CubePDF Utility are as follows.
 
 ## History
 
+* 2024-04-03 version 3.0.0
+    - Fix issues with backup functionality.
+    - Add settings for automatically deleting old backup files.
 * 2024-03-22 version 2.6.2
     - Update PDFium to Chromium 123 compatible.
 * 2024-02-22 version 2.6.1
diff --git a/Tests/Editor/Cube.Pdf.Editor.Tests.csproj b/Tests/Editor/Cube.Pdf.Editor.Tests.csproj
index 13045299..74d878ba 100644
--- a/Tests/Editor/Cube.Pdf.Editor.Tests.csproj
+++ b/Tests/Editor/Cube.Pdf.Editor.Tests.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <Version>2.6.2</Version>
+        <Version>3.0.0</Version>
         <Authors>clown;cube-soft</Authors>
         <Company>CubeSoft</Company>
         <Copyright>Copyright © 2013 CubeSoft, Inc.</Copyright>
diff --git a/Tests/Editor/Sources/Presenters/SettingTest.cs b/Tests/Editor/Sources/Presenters/SettingTest.cs
index 9be79653..b44358f2 100644
--- a/Tests/Editor/Sources/Presenters/SettingTest.cs
+++ b/Tests/Editor/Sources/Presenters/SettingTest.cs
@@ -115,7 +115,7 @@ private void AssertObject(SettingViewModel src)
         {
             Assert.That(src.Title,                 Is.Not.Null.And.Not.Empty);
             Assert.That(src.Version.Text,          Is.Not.Null.And.Not.Empty);
-            Assert.That(src.Version.Value,         Does.StartWith("CubePDF Utility 2.6.2 "));
+            Assert.That(src.Version.Value,         Does.StartWith("CubePDF Utility 3.0.0 "));
             Assert.That(src.Windows.Text,          Does.StartWith("Microsoft Windows"));
             Assert.That(src.Framework.Text,        Does.StartWith("Microsoft .NET Framework"));
             Assert.That(src.Link.Text,             Is.EqualTo("Copyright © 2013 CubeSoft, Inc."));