diff --git a/api/pages/project.ts b/api/pages/project.ts
index 4ee9d5c..f7f058a 100644
--- a/api/pages/project.ts
+++ b/api/pages/project.ts
@@ -1,4 +1,4 @@
-import type { CommitId, PageId, UnixTime, UserId } from "../../base.ts";
+import type { PageId, UnixTime, UserId } from "../../base.ts";
 
 /** the response type of https://scrpabox.io/api/pages/:projectname */
 export interface PageList {
@@ -23,9 +23,6 @@ export interface PageSummery {
   /** page id */
   id: PageId;
 
-  /** 最新の編集コミットid */
-  commitId: CommitId;
-
   /** the title of a page */
   title: string;