diff --git a/package.json b/package.json
index 840b143..98ffe5b 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   "dependencies": {
     "axios": "^0.18.0",
     "jsdom": "*",
-    "koa": "2.3.0",
+    "koa": "2.15.4",
     "koa-bodyparser": "4.2.0",
     "koa-logger": "3.0.1",
     "koa-router": "7.2.1",