diff --git a/docs/usage.ts b/docs/usage.ts
index 95b7ffc..e4849ee 100644
--- a/docs/usage.ts
+++ b/docs/usage.ts
@@ -1,5 +1,5 @@
 import { earlyHintsResponse, withEarlyHints } from "../unstable.ts";
-import { contentType } from "https://deno.land/std@0.155.0/media_types/mod.ts";
+import { contentType } from "https://deno.land/std@0.173.0/media_types/mod.ts";
 
 Deno.serve(withEarlyHints(async function* (_request) {
   // sends early hints response
diff --git a/test.ts b/test.ts
index 3c5cac2..56c4ee5 100644
--- a/test.ts
+++ b/test.ts
@@ -1,4 +1,4 @@
-import { assertEquals } from "https://deno.land/std@0.155.0/testing/asserts.ts";
+import { assertEquals } from "https://deno.land/std@0.173.0/testing/asserts.ts";
 import { flakyTest } from "https://deno.land/x/flaky_test@v1.0.2/mod.ts";
 
 import { statusCodes } from "./src/status_code.ts";
diff --git a/unstable.ts b/unstable.ts
index 891545c..d8cce5d 100644
--- a/unstable.ts
+++ b/unstable.ts
@@ -1,5 +1,5 @@
 import { statusCodes } from "./src/status_code.ts";
-import { writeAll } from "https://deno.land/std@0.155.0/streams/mod.ts";
+import { writeAll } from "https://deno.land/std@0.173.0/streams/mod.ts";
 
 export type ResponseObject = Pick<Response, "headers" | "status" | "body">;
 export type Handler = (
@@ -43,7 +43,7 @@ export function earlyHintsResponse(pathList: string[]): ResponseObject {
  *
  * ```ts
  * import { earlyHintsResponse, withEarlyHints } from "https://deno.land/x/103_early_hints@$VERSION/unstable.ts";
- * import { contentType } from "https://deno.land/std@0.155.0/media_types/mod.ts";
+ * import { contentType } from "https://deno.land/std@0.173.0/media_types/mod.ts";
  *
  * Deno.serve(withEarlyHints(async function* (_request) {
  *   // sends early hints response