diff --git a/api/response.ts b/api/response.ts
index 9aee547..06e02ab 100644
--- a/api/response.ts
+++ b/api/response.ts
@@ -1,4 +1,3 @@
-import { Omit } from "../utils.ts";
 import {
   CommitId,
   Line,
diff --git a/utils.ts b/utils.ts
deleted file mode 100644
index 6a86a92..0000000
--- a/utils.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-// utilities
-export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;