diff --git a/index.js b/index.js
index 816a15a..4d149aa 100644
--- a/index.js
+++ b/index.js
@@ -4,7 +4,7 @@ const debug = require('debug')('koa-session');
 const ContextSession = require('./lib/context');
 const util = require('./lib/util');
 const assert = require('assert');
-const uuid = require('uuid/v4');
+const uuid = require('uuid');
 const is = require('is-type-of');
 
 const CONTEXT_SESSION = Symbol('context#contextSession');
@@ -105,8 +105,8 @@ function formatOpts(opts) {
   }
 
   if (!opts.genid) {
-    if (opts.prefix) opts.genid = () => `${opts.prefix}${uuid()}`;
-    else opts.genid = uuid;
+    if (opts.prefix) opts.genid = () => `${opts.prefix}${uuid.v4()}`;
+    else opts.genid = uuid.v4;
   }
 
   return opts;
diff --git a/package.json b/package.json
index 6feecb9..87249f9 100644
--- a/package.json
+++ b/package.json
@@ -23,16 +23,16 @@
     "mocha": "^5.2.0",
     "mz-modules": "^2.0.0",
     "pedding": "^1.1.0",
-    "uid-safe": "^2.1.3",
     "should": "8",
-    "supertest": "^3.3.0"
+    "supertest": "^3.3.0",
+    "uid-safe": "^2.1.3"
   },
   "license": "MIT",
   "dependencies": {
-    "crc": "^3.4.4",
-    "debug": "^3.1.0",
-    "is-type-of": "^1.0.0",
-    "uuid": "^3.3.2"
+    "crc": "^4.0.0",
+    "debug": "^4.3.3",
+    "is-type-of": "^1.2.1",
+    "uuid": "^8.3.2"
   },
   "engines": {
     "node": ">=7.6"