diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02fd0e0..4d1c362 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 
 All notable changes to this project will be documented in this file.
 
-## Unreleased
+## 5.5.0 (2025-01-11)
 
 ### Enhancements
 
@@ -22,6 +22,7 @@ All notable changes to this project will be documented in this file.
 
 ### Other
 
+- Added Vietnamese translation (by vtvinh24) (#485).
 - Updated default rules and favicons (#440, #443, #444, #447, #457, #461).
 - Updated Brazilian Portuguese translations (#450).
 - Updated French translations (#459).
diff --git a/_locales/Readme.md b/_locales/Readme.md
index 4d0cf15..269a2ef 100644
--- a/_locales/Readme.md
+++ b/_locales/Readme.md
@@ -4,6 +4,8 @@ If you are a translator new to localize WebExtension,
 you may want to read <https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization>
 and the [locale-specific message reference](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/i18n/Locale-Specific_Message_reference).
 
+The English strings in `en_US` are the reference for the other translations.
+
 The `messages.json` files contains all localized strings used in the extension.
 Note that you don't need to translate the `description` part.
 That will never show up in the UI. It is only there to help the translating of the messages,
diff --git a/_locales/uk/messages.json b/_locales/uk/messages.json
index 2f44b15..a591b54 100644
--- a/_locales/uk/messages.json
+++ b/_locales/uk/messages.json
@@ -266,7 +266,7 @@
 	},
 	// DKIM_SIGERROR - POLICY
 	"DKIM_POLICYERROR_MISSING_SIG": {
-		"message": "Без підпису, повинен бути підписаний $1"
+		"message": "Без підпису, повинен бути підписаний $1",
 		"description": "Error if a message has no signature, but the sign rules state that it should be signed"
 	},
 	"DKIM_POLICYERROR_KEYMISMATCH": {
diff --git a/content/options.html b/content/options.html
index 746a2e7..bc6c064 100644
--- a/content/options.html
+++ b/content/options.html
@@ -329,7 +329,6 @@ <h1 data-i18n="about_name"></h1>
       <p><a href="https://github.com/lieser/dkim_verifier/graphs/contributors" data-i18n="about_contributors"></a></p>
       <p data-i18n="about_translators"></p>
       <ul>
-        <li>de: ionum</li>
         <li>de: Philippe Lieser</li>
         <li>es-ES: Peter O Brien</li>
         <li>fr: Anaël MOBILIA</li>
@@ -340,6 +339,7 @@ <h1 data-i18n="about_name"></h1>
         <li>pt-BR: João Paulo</li>
         <li>sv-SE: Phoenix</li>
         <li>uk: lexxai</li>
+        <li>vi-VN: vtvinh24</li>
         <li>zh-CN: YFdyh000</li>
         <li>zh-TW: NightFeather</li>
       </ul>
diff --git a/manifest.json b/manifest.json
index 33e8d2d..60a958e 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,7 +2,7 @@
 	"manifest_version": 2,
 	"name": "__MSG_about_name__",
 	"description": "__MSG_about_summary__",
-	"version": "5.4.0",
+	"version": "5.5.0",
 	"author": "Philippe Lieser",
 	"homepage_url": "https://github.com/lieser/dkim_verifier/wiki",
 	"default_locale": "en_US",