diff --git a/package.json b/package.json
index 2fab22c..20190f6 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "koa-router": "^7.2.0",
     "koa-static": "^3.0.0",
     "lodash": "^4.17.4",
-    "lru-cache": "^4.0.2",
+    "lru-cache": "^4.1.0",
     "markdown-it": "^8.3.1",
     "mkdirp": "^0.5.1",
     "nib": "^1.1.2",
@@ -65,13 +65,13 @@
     "eslint": "^3.19.0",
     "eslint-config-standard": "^10.2.1",
     "eslint-plugin-babel": "^4.1.1",
-    "eslint-plugin-import": "^2.4.0",
+    "eslint-plugin-import": "^2.3.0",
     "eslint-plugin-node": "^5.0.0",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-standard": "^3.0.1",
     "eslint-plugin-vue": "^2.0.1",
     "extract-text-webpack-plugin": "^2.1.0",
-    "file-loader": "^0.11.1",
+    "file-loader": "^0.11.2",
     "html-webpack-plugin": "^2.28.0",
     "img-loader": "^2.0.0",
     "lodash-webpack-plugin": "^0.11.4",
diff --git a/server/dev-tools/webpack-hot.js b/server/dev-tools/webpack-hot.js
index f7f071f..81359b2 100644
--- a/server/dev-tools/webpack-hot.js
+++ b/server/dev-tools/webpack-hot.js
@@ -7,7 +7,7 @@ const debug = _debug('hi:webpack-hmr')
 export default compiler => {
   debug('Enable Webpack Hot Module Replacement (HMR).')
 
-  const middleware = webpackHotMiddleware(compiler)
+  const middleware = webpackHotMiddleware(compiler, {heartbeat: 5000})
   return async function koaWebpackHMR(ctx, next) {
     /* eslint prefer-const: 0 */
     let hasNext = await applyExpressMiddleware(middleware, ctx.req, ctx.res)
diff --git a/src/plugins/http.js b/src/plugins/http.js
index 8eee677..8e80c6e 100644
--- a/src/plugins/http.js
+++ b/src/plugins/http.js
@@ -5,14 +5,10 @@ const {prototype: proto} = Vue
 
 axios.defaults.baseURL = (__SERVER__ ? INNER_SERVER : SERVER_PREFIX) + 'api'
 
-if (!__DEV__ || !proto._$http) {
+if (!__DEV__ || !proto.hasOwnProperty('$http')) {
   Object.defineProperty(proto, '$http', __SERVER__ ? {
     get() {
       return this.$ssrContext.axios
     }
   } : {value: axios})
-
-  if (__DEV__) {
-    proto._$http = true
-  }
 }
diff --git a/yarn.lock b/yarn.lock
index d9ff8ca..5397dbd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2366,7 +2366,7 @@ eslint-plugin-html@^2.0.0:
   dependencies:
     htmlparser2 "^3.8.2"
 
-eslint-plugin-import@^2.4.0:
+eslint-plugin-import@^2.3.0:
   version "2.4.0"
   resolved "http://registry.npm.taobao.org/eslint-plugin-import/download/eslint-plugin-import-2.4.0.tgz#eb468dab7196d8a8b67fdea9223e1660f418eabb"
   dependencies:
@@ -2627,9 +2627,9 @@ file-entry-cache@^2.0.0:
     flat-cache "^1.2.1"
     object-assign "^4.0.1"
 
-file-loader@^0.11.1:
-  version "0.11.1"
-  resolved "http://registry.npm.taobao.org/file-loader/download/file-loader-0.11.1.tgz#6b328ee1234a729e4e47d36375dd6d35c0e1db84"
+file-loader@^0.11.2:
+  version "0.11.2"
+  resolved "http://registry.npm.taobao.org/file-loader/download/file-loader-0.11.2.tgz#4ff1df28af38719a6098093b88c82c71d1794a34"
   dependencies:
     loader-utils "^1.0.2"
 
@@ -4134,13 +4134,20 @@ lru-cache@^3.2.0:
   dependencies:
     pseudomap "^1.0.1"
 
-lru-cache@^4.0.1, lru-cache@^4.0.2:
+lru-cache@^4.0.1:
   version "4.0.2"
   resolved "http://registry.npm.taobao.org/lru-cache/download/lru-cache-4.0.2.tgz#1d17679c069cda5d040991a09dbc2c0db377e55e"
   dependencies:
     pseudomap "^1.0.1"
     yallist "^2.0.0"
 
+lru-cache@^4.1.0:
+  version "4.1.0"
+  resolved "http://registry.npm.taobao.org/lru-cache/download/lru-cache-4.1.0.tgz#59be49a683b8d986a939f1ca60fdb6989f4b2046"
+  dependencies:
+    pseudomap "^1.0.1"
+    yallist "^2.0.0"
+
 macaddress@^0.2.8:
   version "0.2.8"
   resolved "http://registry.npm.taobao.org/macaddress/download/macaddress-0.2.8.tgz#5904dc537c39ec6dbefeae902327135fa8511f12"