diff --git a/Mailgun.Models.SignedEvent/EventDetails/Message.cs b/Mailgun.Models.SignedEvent/EventDetails/Message.cs
index 70f7212..7e691e5 100644
--- a/Mailgun.Models.SignedEvent/EventDetails/Message.cs
+++ b/Mailgun.Models.SignedEvent/EventDetails/Message.cs
@@ -12,7 +12,7 @@ public class Message
     {
         public Headers Headers { get; set; }
 
-        public List<string> Attachments { get; set; }
+        public List<Attachment> Attachments { get; set; }
 
         public List<string> Recipients { get; set; }
 
diff --git a/Mailgun.Models.SignedEvent/EventDetails/MessageDetails/Attachment.cs b/Mailgun.Models.SignedEvent/EventDetails/MessageDetails/Attachment.cs
new file mode 100644
index 0000000..cca2b25
--- /dev/null
+++ b/Mailgun.Models.SignedEvent/EventDetails/MessageDetails/Attachment.cs
@@ -0,0 +1,16 @@
+// <copyright file="Attachment.cs" company="Balazs Keresztury">
+// Copyright (c) Balazs Keresztury. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace Mailgun.Models.SignedEvent.EventDetails.MessageDetails
+{
+    public class Attachment
+    {
+        public int Size { get; set; }
+
+        public string ContentType { get; set; }
+
+        public string Filename { get; set; }
+    }
+}
diff --git a/Mailgun.Models.SignedEvent/Mailgun.Models.SignedEvent.csproj b/Mailgun.Models.SignedEvent/Mailgun.Models.SignedEvent.csproj
index 7160a5d..a06eb39 100644
--- a/Mailgun.Models.SignedEvent/Mailgun.Models.SignedEvent.csproj
+++ b/Mailgun.Models.SignedEvent/Mailgun.Models.SignedEvent.csproj
@@ -5,7 +5,7 @@
     <Authors>Balazs Keresztury</Authors>
     <Copyright>Copyright (c) 2020 Balazs Keresztury</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
-    <Version>1.1.0</Version>
+    <Version>1.1.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <PackageProjectUrl>https://github.com/belidzs/Mailgun.Models.SignedEvent</PackageProjectUrl>
     <RepositoryUrl>https://github.com/belidzs/Mailgun.Models.SignedEvent</RepositoryUrl>