diff --git a/Sources/ForgejoKit/Services/PullRequestService.swift b/Sources/ForgejoKit/Services/PullRequestService.swift
index e376ebd..2ad555b 100644
--- a/Sources/ForgejoKit/Services/PullRequestService.swift
+++ b/Sources/ForgejoKit/Services/PullRequestService.swift
@@ -34,12 +34,14 @@ public final class PullRequestService: Sendable {
     private struct MergePullRequestPayload: Codable {
         let method: String
         let deleteBranchAfterMerge: Bool
+        let mergeTitleField: String?
         let mergeMessageField: String?
 
         // swiftlint:disable:next nesting
         enum CodingKeys: String, CodingKey {
             case method = "Do"
             case deleteBranchAfterMerge = "delete_branch_after_merge"
+            case mergeTitleField = "merge_title_field"
             case mergeMessageField = "merge_message_field"
         }
     }
@@ -157,13 +159,14 @@ public final class PullRequestService: Sendable {
     // swiftlint:disable:next function_parameter_count
     public func mergePullRequest(
         owner: String, repo: String, index: Int,
-        method: String, message: String?,
+        method: String, title: String? = nil, message: String? = nil,
         deleteBranch: Bool,
     ) async throws {
         let url = try client.makeRepoURL(owner: owner, repo: repo, path: "/pulls/\(index)/merge")
         let payload = MergePullRequestPayload(
             method: method,
             deleteBranchAfterMerge: deleteBranch,
+            mergeTitleField: title.nilIfEmpty,
             mergeMessageField: message.nilIfEmpty,
         )
         let jsonData = try client.encodeRequestBody(payload)