diff --git a/History.md b/History.md
index 4ab5657..cc2ce3a 100644
--- a/History.md
+++ b/History.md
@@ -1,4 +1,9 @@
 
+0.21.1 / 2018-09-12
+==================
+
+  * deps: pin debug@2 (#1246)
+
 0.21.0 / 2015-05-23
 ==================
 
diff --git a/package.json b/package.json
index 74fad73..cb18901 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "koa",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "description": "Koa web app framework",
   "main": "lib/application.js",
   "scripts": {