diff --git a/sample/package.json b/sample/package.json
index 954f881..6983c4d 100644
--- a/sample/package.json
+++ b/sample/package.json
@@ -29,7 +29,7 @@
     "vue-template-compiler": "2.4.2",
     "webpack": "2.7.0",
     "webpack-dev-middleware": "1.12.0",
-    "webpack-hot-middleware": "2.18.2",
+    "webpack-hot-middleware": "2.21.1",
     "webpack-merge": "4.1.0",
     "webpack-node-externals": "1.6.0"
   }
diff --git a/sample/yarn.lock b/sample/yarn.lock
index b5bdadf..f9553d6 100644
--- a/sample/yarn.lock
+++ b/sample/yarn.lock
@@ -2436,9 +2436,9 @@ webpack-dev-middleware@1.12.0:
     range-parser "^1.0.3"
     time-stamp "^2.0.0"
 
-webpack-hot-middleware@2.18.2:
-  version "2.18.2"
-  resolved "https://registry.yarnpkg.com/webpack-hot-middleware/-/webpack-hot-middleware-2.18.2.tgz#84dee643f037c3d59c9de142548430371aa8d3b2"
+webpack-hot-middleware@2.21.1:
+  version "2.21.1"
+  resolved "https://registry.yarnpkg.com/webpack-hot-middleware/-/webpack-hot-middleware-2.21.1.tgz#1b03b20a1a65a2e2ea0ea987476a5d23370ff176"
   dependencies:
     ansi-html "0.0.7"
     html-entities "^1.2.0"