diff --git a/package.json b/package.json
index 0c322d8..100aad4 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "koa-etag": "^3.0.0",
     "koa-favicon": "^2.0.1",
     "koa-json": "^2.0.2",
-    "koa-mount": "^3.0.0",
+    "koa-mount": "^4.0.0",
     "koa-path-match": "^2.0.0",
     "koa-response-time": "^2.0.0",
     "koa-static": "^4.0.2",