diff --git a/cake.config b/cake.config
new file mode 100644
index 0000000..652d5e8
--- /dev/null
+++ b/cake.config
@@ -0,0 +1,3 @@
+[Nuget]
+; Use the new InProcess client, because some packages have long file paths.
+UseInProcessClient=true
\ No newline at end of file
diff --git a/setup.cake b/setup.cake
index ffa4d4f..fc50ab8 100644
--- a/setup.cake
+++ b/setup.cake
@@ -9,7 +9,8 @@ BuildParameters.SetParameters(
     title: "Cake.Issues.PullRequests.Tfs",
     repositoryOwner: "cake-contrib",
     repositoryName: "Cake.Issues.PullRequests.Tfs",
-    appVeyorAccountName: "cakecontrib");
+    appVeyorAccountName: "cakecontrib",
+    shouldRunCodecov: false);
 
 BuildParameters.PrintParameters(Context);
 
diff --git a/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystem.cs b/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystem.cs
index 5f3f40e..3755fe0 100644
--- a/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystem.cs
+++ b/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystem.cs
@@ -103,6 +103,23 @@ public TfsPullRequestSystem(ICakeLog log, TfsPullRequestSettings settings)
                 this.pullRequest.SourceRefName);
         }
 
+        /// <summary>
+        /// Gets the hash of the latest commit on the source branch.
+        /// Returns <see cref="string.Empty"/> if no pull request could be found.
+        /// </summary>
+        public string LastSourceCommitId
+        {
+            get
+            {
+                if (!this.ValidatePullRequest())
+                {
+                    return string.Empty;
+                }
+
+                return this.pullRequest.LastMergeSourceCommit.CommitId;
+            }
+        }
+
         /// <summary>
         /// Votes for the pullrequest.
         /// </summary>
diff --git a/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystemAliases.cs b/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystemAliases.cs
index d92ea30..e85ff90 100644
--- a/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystemAliases.cs
+++ b/src/Cake.Issues.PullRequests.Tfs/TfsPullRequestSystemAliases.cs
@@ -273,5 +273,42 @@ public static void TfsVotePullRequest(
             var pullRequest = new TfsPullRequestSystem(context.Log, settings);
             pullRequest.Vote(vote);
         }
+
+        /// <summary>
+        /// Gets the last commit hash on the source branch of the Team Foundation Server or
+        /// Visual Studio Team Services pull request using the specified settings.
+        /// </summary>
+        /// <param name="context">The context.</param>
+        /// <param name="settings">Settings for accessing the pull request system.</param>
+        /// <example>
+        /// <para>Get the hash of the last commit:</para>
+        /// <code>
+        /// <![CDATA[
+        ///     var pullRequestSettings =
+        ///         new TfsPullRequestSettings(
+        ///             new Uri("http://myserver:8080/tfs/defaultcollection/myproject/_git/myrepository"),
+        ///             "refs/heads/feature/myfeature",
+        ///             TfsAuthenticationNtlm());
+        ///
+        ///     var hash =
+        ///         TfsPullRequestLastSourceCommit(
+        ///             pullRequestSettings);
+        /// ]]>
+        /// </code>
+        /// </example>
+        /// <returns>The hash of the last commit on the source branch or <see cref="string.Empty"/>
+        /// if no pull request could be found.</returns>
+        [CakeMethodAlias]
+        [CakeAliasCategory(PullRequestsAliasConstants.PullRequestSystemCakeAliasCategory)]
+        public static string TfsPullRequestLastSourceCommit(
+            this ICakeContext context,
+            TfsPullRequestSettings settings)
+        {
+            context.NotNull(nameof(context));
+            settings.NotNull(nameof(settings));
+
+            var pullRequest = new TfsPullRequestSystem(context.Log, settings);
+            return pullRequest.LastSourceCommitId;
+        }
     }
 }
diff --git a/tools/packages.config b/tools/packages.config
index ba021c5..747e13e 100644
--- a/tools/packages.config
+++ b/tools/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-    <package id="Cake" version="0.21.1" />
+    <package id="Cake" version="0.23.0" />
 </packages>