diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bf8f5987..bd25a89ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 Change Log
 ==========================
 
-unreleased
+3.4.0 (251)
 --------------------------
 
 ### Improvements
diff --git a/CotEditor/CotEditor.help/Contents/Resources/en.lproj/pgs/releasenotes.html b/CotEditor/CotEditor.help/Contents/Resources/en.lproj/pgs/releasenotes.html
index 6fc7ed824..f03d18d1c 100644
--- a/CotEditor/CotEditor.help/Contents/Resources/en.lproj/pgs/releasenotes.html
+++ b/CotEditor/CotEditor.help/Contents/Resources/en.lproj/pgs/releasenotes.html
@@ -24,7 +24,7 @@
 <article>
 <header>
 	<h1>CotEditor 3.4.0</h1>
-	<p>release: <time>2018-05</time></p>
+	<p>release: <time>2018-05-15</time></p>
 </header>
 
 
diff --git a/CotEditor/CotEditor.help/Contents/Resources/ja.lproj/pgs/releasenotes.html b/CotEditor/CotEditor.help/Contents/Resources/ja.lproj/pgs/releasenotes.html
index a437931ff..b41eb085b 100644
--- a/CotEditor/CotEditor.help/Contents/Resources/ja.lproj/pgs/releasenotes.html
+++ b/CotEditor/CotEditor.help/Contents/Resources/ja.lproj/pgs/releasenotes.html
@@ -24,7 +24,7 @@
 <article>
 <header>
 	<h1>CotEditor 3.4.0</h1>
-	<p>リリース: <time>2018-05</time></p>
+	<p>リリース: <time>2018-05-15</time></p>
 </header>
 
 
diff --git a/CotEditor/Info-AppStore.plist b/CotEditor/Info-AppStore.plist
index d59372e6d..cd9a1e27a 100644
--- a/CotEditor/Info-AppStore.plist
+++ b/CotEditor/Info-AppStore.plist
@@ -988,13 +988,13 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.4.0</string>
+	<string>3.4.1-alpha</string>
 	<key>CFBundleSignature</key>
 	<string>cEd1</string>
 	<key>CFBundleSpokenName</key>
 	<string>Cot editor</string>
 	<key>CFBundleVersion</key>
-	<string>251</string>
+	<string>252</string>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
 	<key>LSApplicationCategoryType</key>
diff --git a/CotEditor/Info.plist b/CotEditor/Info.plist
index 35c9c9280..e04fd0a69 100644
--- a/CotEditor/Info.plist
+++ b/CotEditor/Info.plist
@@ -988,13 +988,13 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.4.0</string>
+	<string>3.4.1-alpha</string>
 	<key>CFBundleSignature</key>
 	<string>cEd1</string>
 	<key>CFBundleSpokenName</key>
 	<string>Cot editor</string>
 	<key>CFBundleVersion</key>
-	<string>251</string>
+	<string>252</string>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
 	<key>LSApplicationCategoryType</key>