diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3969e0a..b9b76a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## [Unreleased]
+## [1.5.1] - 2023-01-25
 ### Fixed
 * Fix CI build for netcoreapp3.1.
 * Fix `Formality` options `PreferLess` and `PreferMore` for document
@@ -111,7 +111,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 Initial release.
 
 
-[Unreleased]: https://github.com/DeepLcom/deepl-dotnet/compare/v1.5.0...HEAD
+[1.5.1]: https://github.com/DeepLcom/deepl-dotnet/compare/v1.5.0...v1.5.1
 [1.5.0]: https://github.com/DeepLcom/deepl-dotnet/compare/v1.4.0...v1.5.0
 [1.4.0]: https://github.com/DeepLcom/deepl-dotnet/compare/v1.3.0...v1.4.0
 [1.3.0]: https://github.com/DeepLcom/deepl-dotnet/compare/v1.2.1...v1.3.0
diff --git a/DeepL/DeepL.csproj b/DeepL/DeepL.csproj
index b3894f0..30078c5 100644
--- a/DeepL/DeepL.csproj
+++ b/DeepL/DeepL.csproj
@@ -3,9 +3,9 @@
   <PropertyGroup>
     <Description>DeepL.net is the official DeepL .NET client library.</Description>
     <AssemblyTitle>DeepL.net</AssemblyTitle>
-    <Version>1.5.0</Version>
-    <PackageVersion>1.5.0</PackageVersion>
-    <FileVersion>1.5.0.0</FileVersion>
+    <Version>1.5.1</Version>
+    <PackageVersion>1.5.1</PackageVersion>
+    <FileVersion>1.5.1.0</FileVersion>
     <AssemblyVersion>1.0.0.0</AssemblyVersion>
     <TargetFrameworks>net5.0;netstandard2.0</TargetFrameworks>
     <LangVersion>8</LangVersion>
diff --git a/DeepLTests/GeneralTest.cs b/DeepLTests/GeneralTest.cs
index b7a4eee..5e8008c 100644
--- a/DeepLTests/GeneralTest.cs
+++ b/DeepLTests/GeneralTest.cs
@@ -16,7 +16,7 @@ public sealed class GeneralTest : BaseDeepLTest {
     /// </summary>
     [Fact]
     public void TestVersion() {
-      Assert.Equal("1.5.0", Translator.Version());
+      Assert.Equal("1.5.1", Translator.Version());
 
       // Note the assembly version must remain unchanged for binary compatibility, excepting the major version.
       Assert.Equal("1.0.0.0", typeof(Translator).Assembly.GetName().Version?.ToString());