diff --git a/src/NLog.MailKit/MailTarget.cs b/src/NLog.MailKit/MailTarget.cs
index b9ed1a8..a835fc7 100644
--- a/src/NLog.MailKit/MailTarget.cs
+++ b/src/NLog.MailKit/MailTarget.cs
@@ -590,7 +590,7 @@ private MimeMessage CreateMailMessage(LogEventInfo lastEvent, string body)
             var encoding = RenderLogEvent(Encoding, lastEvent, DefaultEncoding);
             msg.Body = new TextPart(html ? TextFormat.Html : TextFormat.Plain)
             {
-                Text = newBody,
+                Text = newBody ?? string.Empty,
                 ContentType = { Charset = encoding?.WebName }
             };
 
diff --git a/src/NLog.MailKit/NLog.MailKit.csproj b/src/NLog.MailKit/NLog.MailKit.csproj
index b010acd..57371a4 100644
--- a/src/NLog.MailKit/NLog.MailKit.csproj
+++ b/src/NLog.MailKit/NLog.MailKit.csproj
@@ -28,15 +28,15 @@ If the mail target was already available on your platform, this package will ove
 		<AssemblyOriginatorKeyFile>NLog.snk</AssemblyOriginatorKeyFile>
 		<DelaySign>false</DelaySign>
 		<PackageReleaseNotes>
-Changelog:
+			Changelog:
 
-- SmtpAuthenticationMode.OAuth2 with SmtpUserName (OAuth UserName) and SmtpPassword (OAuth AccessToken)
-- Updated NLog v6.0.5
+			- Update MailKit to v4.15.1
+			- Update NLog to v6.1.1
 
-See https://github.com/NLog/NLog.MailKit/releases
-      
-</PackageReleaseNotes>
-		<VersionPrefix>6.0.5</VersionPrefix>
+			See https://github.com/NLog/NLog.MailKit/releases
+
+		</PackageReleaseNotes>
+		<VersionPrefix>6.1.1</VersionPrefix>
 		<AssemblyVersion>6.0.0.0</AssemblyVersion>
 		<FileVersion>$(VersionPrefix).0</FileVersion>
 		<PackageReadmeFile>README.md</PackageReadmeFile>
@@ -55,11 +55,11 @@ See https://github.com/NLog/NLog.MailKit/releases
     <LangVersion>9.0</LangVersion>
 	</PropertyGroup>
 	<ItemGroup>
-		<PackageReference Include="MailKit" Version="4.7.1.1" />
+		<PackageReference Include="MailKit" Version="4.15.1" />
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="NLog" Version="6.0.5" />
+		<PackageReference Include="NLog" Version="6.1.1" />
 	</ItemGroup>
 	<ItemGroup>
 		<None Include="..\..\README.md">