diff --git a/Octokit.Tests/Clients/RepositoriesClientTests.cs b/Octokit.Tests/Clients/RepositoriesClientTests.cs
index efa1efe5..d8c6c958 100644
--- a/Octokit.Tests/Clients/RepositoriesClientTests.cs
+++ b/Octokit.Tests/Clients/RepositoriesClientTests.cs
@@ -1015,12 +1015,12 @@ namespace Octokit.Tests.Clients
             {
                 var connection = Substitute.For<IApiConnection>();
                 var client = new RepositoriesClient(connection);
-                var update = new RepositoryUpdate();
+                var update = new RepositoryUpdate("repo");
 
                 client.Edit("owner", "repo", update);
 
                 connection.Received()
-                    .Patch<Repository>(Arg.Is<Uri>(u => u.ToString() == "repos/owner/repo"), Arg.Any<RepositoryUpdate>());
+                    .Patch<Repository>(Arg.Is<Uri>(u => u.ToString() == "repos/owner/repo"), Arg.Any<RepositoryUpdate>(), "application/vnd.github.polaris-preview+json");
             }
 
             [Fact]
@@ -1028,12 +1028,12 @@ namespace Octokit.Tests.Clients
             {
                 var connection = Substitute.For<IApiConnection>();
                 var client = new RepositoriesClient(connection);
-                var update = new RepositoryUpdate();
+                var update = new RepositoryUpdate("repo");
 
                 client.Edit(1, update);
 
                 connection.Received()
-                    .Patch<Repository>(Arg.Is<Uri>(u => u.ToString() == "repositories/1"), Arg.Any<RepositoryUpdate>());
+                    .Patch<Repository>(Arg.Is<Uri>(u => u.ToString() == "repositories/1"), Arg.Any<RepositoryUpdate>(), "application/vnd.github.polaris-preview+json");
             }
 
             [Fact]
diff --git a/Octokit/Clients/RepositoriesClient.cs b/Octokit/Clients/RepositoriesClient.cs
index 3717e79a..3e9b8026 100644
--- a/Octokit/Clients/RepositoriesClient.cs
+++ b/Octokit/Clients/RepositoriesClient.cs
@@ -192,8 +192,9 @@ namespace Octokit
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNull(update, "update");
+            Ensure.ArgumentNotNull(update.Name, "update.Name");
 
-            return ApiConnection.Patch<Repository>(ApiUrls.Repository(owner, name), update);
+            return ApiConnection.Patch<Repository>(ApiUrls.Repository(owner, name), update, AcceptHeaders.SquashCommitPreview);
         }
 
         /// <summary>
@@ -206,7 +207,7 @@ namespace Octokit
         {
             Ensure.ArgumentNotNull(update, "update");
 
-            return ApiConnection.Patch<Repository>(ApiUrls.Repository(repositoryId), update);
+            return ApiConnection.Patch<Repository>(ApiUrls.Repository(repositoryId), update, AcceptHeaders.SquashCommitPreview);
         }
 
         /// <summary>
diff --git a/Octokit/Models/Request/RepositoryUpdate.cs b/Octokit/Models/Request/RepositoryUpdate.cs
index ad413593..dbce3686 100644
--- a/Octokit/Models/Request/RepositoryUpdate.cs
+++ b/Octokit/Models/Request/RepositoryUpdate.cs
@@ -1,4 +1,5 @@
-using System.Diagnostics;
+using System;
+using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 
@@ -11,38 +12,77 @@ namespace Octokit
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public class RepositoryUpdate
     {
+        [Obsolete("Please use the ctor RepositoryUpdate(string name) as Name is a required field")]
+        public RepositoryUpdate()
+        {
+
+        }
+
+        /// <summary>
+        /// Creates an object that describes an update to a repository on GitHub.
+        /// </summary>
+        /// <param name="name">The name of the repository. This is the only required parameter.</param>
+        public RepositoryUpdate(string name)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+
+            Name = name;
+        }
+
         /// <summary>
         /// Required. Gets or sets the repository name.
         /// </summary>
         public string Name { get; set; }
+        
         /// <summary>
         /// Optional. Gets or sets the repository description. The default is null (do not update)
         /// </summary>
         public string Description { get; set; }
+        
         /// <summary>
         /// Optional. Gets or sets the repository homepage url. The default is null (do not update).
         /// </summary>
         public string Homepage { get; set; }
+        
         /// <summary>
         /// Gets or sets whether to make the repository private. The default is null (do not update).
         /// </summary>
         public bool? Private { get; set; }
+        
         /// <summary>
         /// Gets or sets whether to enable issues for the repository. The default is null (do not update).
         /// </summary>
         public bool? HasIssues { get; set; }
+        
         /// <summary>
         /// Optional. Gets or sets whether to enable the wiki for the repository. The default is null (do not update).
         /// </summary>
         public bool? HasWiki { get; set; }
+        
         /// <summary>
         /// Optional. Gets or sets whether to enable downloads for the repository. The default is null (do not update).
         /// </summary>
         public bool? HasDownloads { get; set; }
+        
         /// <summary>
         /// Optional. Gets or sets the default branch. The default is null (do not update).
         /// </summary>
         public string DefaultBranch { get; set; }
+        
+        /// <summary>
+        /// Optional. Allows the "Rebase and Merge" method to be used.
+        /// </summary>
+        public bool? AllowRebaseMerge { get; set; }
+
+        /// <summary>
+        /// Optional. Allows the "Squash Merge" merge method to be used.
+        /// </summary>
+        public bool? AllowSquashMerge { get; set; }
+
+        /// <summary>
+        /// Optional. Allows the "Create a merge commit" merge method to be used.
+        /// </summary>
+        public bool? AllowMergeCommit { get; set; }
 
         [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
         internal string DebuggerDisplay