diff --git a/CHANGELOG.md b/CHANGELOG.md
index f4ec632..2458b1b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   Both paths will continue to work in the v2 version of the API, but `/v2/document` is the intended one.
 * Made `DeepLException` and subclasses, `Usage` and `JsonFieldsStruct` constructors public, to allow for easier mocking of the `ITranslator` interface.
   * [#40](https://github.com/DeepLcom/deepl-dotnet/issues/40) thanks to [PascalVorwerkSaixon](https://github.com/PascalVorwerkSaxion)
+* New language available: Arabic (`'ar'`). Add
+  language code constants and tests.
+  Note: older library versions also support the new languages, this update only
+  adds new code constants.
 
 
 ## [1.8.0] - 2023-11-03
diff --git a/DeepL/LanguageCode.cs b/DeepL/LanguageCode.cs
index d77fed1..199e306 100644
--- a/DeepL/LanguageCode.cs
+++ b/DeepL/LanguageCode.cs
@@ -9,6 +9,9 @@ namespace DeepL {
   ///   <see cref="ITranslator.GetTargetLanguagesAsync" />.
   /// </summary>
   public static class LanguageCode {
+    /// <summary>Arabic language code, may be used as source or target language.</summary>
+    public const string Arabic = "ar";
+
     /// <summary>Bulgarian language code, may be used as source or target language.</summary>
     public const string Bulgarian = "bg";
 
diff --git a/DeepLTests/BaseDeepLTest.cs b/DeepLTests/BaseDeepLTest.cs
index 34ac792..433eb36 100644
--- a/DeepLTests/BaseDeepLTest.cs
+++ b/DeepLTests/BaseDeepLTest.cs
@@ -63,6 +63,8 @@ protected static MockHttpMessageHandler getMockHandler(String responseMessage) {
 
     protected static string ExampleText(string language) {
       switch (language) {
+        case "ar":
+          return "شعاع البروتون";
         case "bg":
           return "протонен лъч";
         case "cs":