diff --git a/src/index.js b/src/index.js
index 744d65e4c..f081c3dac 100644
--- a/src/index.js
+++ b/src/index.js
@@ -22,10 +22,8 @@ function plugin (Vue, opts = {}) {
     return
   }
 
-  if (process.env.NODE_ENV !== 'production' && version < 1) {
-    warn('vue-i18n (' + plugin.version
-      + ') need to use vue version 1.0 or later (vue version: '
-      + Vue.version + ').')
+  if (process.env.NODE_ENV !== 'production' && version < 2) {
+    warn(`vue-i18n (${plugin.version}) need to use Vue 2.0 or later (Vue: ${Vue.version}).`)
     return
   }
 
@@ -33,7 +31,7 @@ function plugin (Vue, opts = {}) {
   setupLangVM(Vue, lang)
 
   Asset(Vue, langVM)
-  Override(Vue, langVM, version)
+  Override(Vue, langVM)
   Config(Vue, langVM, lang)
   Extend(Vue)
 }
diff --git a/src/override.js b/src/override.js
index ae6fe92bd..5db0f2e39 100644
--- a/src/override.js
+++ b/src/override.js
@@ -1,15 +1,4 @@
-export default function (Vue, langVM, version) {
-  function update (vm) {
-    if (version > 1) {
-      vm.$forceUpdate()
-    } else {
-      let i = vm._watchers.length
-      while (i--) {
-        vm._watchers[i].update(true) // shallow updates
-      }
-    }
-  }
-
+export default function (Vue, langVM) {
   // override _init
   const init = Vue.prototype._init
   Vue.prototype._init = function (options) {
@@ -18,7 +7,7 @@ export default function (Vue, langVM, version) {
     if (!this.$parent) { // root
       this._$lang = langVM
       this._langUnwatch = this._$lang.$watch('$data', (val, old) => {
-        update(this)
+        this.$forceUpdate()
       }, { deep: true })
     }
   }
diff --git a/test/specs/component.js b/test/specs/component.js
index d89525920..ce465cd05 100644
--- a/test/specs/component.js
+++ b/test/specs/component.js
@@ -4,8 +4,6 @@ import locales from './fixture/locales'
 
 
 describe('component locales', () => {
-  const version = Number(Vue.version.split('.')[0])
-
   before(done => {
     Object.keys(locales).forEach(lang => {
       Vue.locale(lang, locales[lang])
@@ -31,12 +29,8 @@ describe('component locales', () => {
         }
       }
     }
-    if (version >= 2) {
-      compOptions.render = function (h) {
-        return h('p', {}, [this.$t('foo.bar.buz')])
-      }
-    } else {
-      compOptions.template = '<p>{{* $t("foo.bar.buz") }}</p>'
+    compOptions.render = function (h) {
+      return h('p', {}, [this.$t('foo.bar.buz')])
     }
 
     const options = {
@@ -44,12 +38,8 @@ describe('component locales', () => {
       components: { component1: compOptions }
     }
 
-    if (version >= 2) {
-      options.render = function (h) {
-        return h('div', {}, [h('component1', {})])
-      }
-    } else {
-      options.template = '<div><component1></component1></div>'
+    options.render = function (h) {
+      return h('div', {}, [h('component1', {})])
     }
 
     vm = new Vue(options)
diff --git a/test/specs/hot.js b/test/specs/hot.js
index a1495d119..907625816 100644
--- a/test/specs/hot.js
+++ b/test/specs/hot.js
@@ -3,8 +3,6 @@ import Vue from 'vue'
 import locales from './fixture/locales'
 
 describe('hot reloading', () => {
-  const version = Number(Vue.version.split('.')[0])
-
   let el
   let orgLocale
   const expectLocale = 'the world updated'
@@ -34,17 +32,11 @@ describe('hot reloading', () => {
       el,
       data () { return { lang: 'en' } }
     }
-
-    if (version >= 2) {
-      options.render = function (h) {
-        return h('p', {}, [this.$t('message.hello', this.lang)])
-      }
-    } else {
-      options.template = '<p>{{ $t("message.hello", lang) }}</p>'
+    options.render = function (h) {
+      return h('p', {}, [this.$t('message.hello', this.lang)])
     }
 
     const vm = new Vue(options)
-
     Vue.nextTick(() => {
       assert.equal(vm.$el.textContent, locales.en.message.hello)
 
diff --git a/test/specs/i18n.js b/test/specs/i18n.js
index 299153ba9..39207a83d 100644
--- a/test/specs/i18n.js
+++ b/test/specs/i18n.js
@@ -4,8 +4,6 @@ import locales from './fixture/locales'
 
 
 describe('i18n', () => {
-  const version = Number(Vue.version.split('.')[0])
-
   before(done => {
     Object.keys(locales).forEach(lang => {
       Vue.locale(lang, locales[lang])
@@ -540,13 +538,8 @@ describe('i18n', () => {
           return { lang: 'en' }
         }
       }
-
-      if (version >= 2) {
-        options.render = function (h) {
-          return h('p', {}, [this.$t('message.hello', this.lang)])
-        }
-      } else {
-        options.template = '<p>{{ $t("message.hello", lang) }}</p>'
+      options.render = function (h) {
+        return h('p', {}, [this.$t('message.hello', this.lang)])
       }
 
       const vm = new Vue(options)
@@ -572,12 +565,8 @@ describe('i18n', () => {
 
     it('should translate', done => {
       const compOptions = {}
-      if (version >= 2) {
-        compOptions.render = function (h) {
-          return h('p', {}, [this.$t('message.hoge')])
-        }
-      } else {
-        compOptions.template = '<p>{{* $t("message.hoge") }}</p>'
+      compOptions.render = function (h) {
+        return h('p', {}, [this.$t('message.hoge')])
       }
 
       const options = {
@@ -585,15 +574,11 @@ describe('i18n', () => {
         components: { hoge: compOptions }
       }
 
-      if (version >= 2) {
-        options.render = function (h) {
-          return h('div', {}, [
-            h('p', {}, [this.$t('message.hello')]),
-            h('hoge', {})
-          ])
-        }
-      } else {
-        options.template = '<div><p>{{ $t("message.hello") }}</p><hoge></hoge></div>'
+      options.render = function (h) {
+        return h('div', {}, [
+          h('p', {}, [this.$t('message.hello')]),
+          h('hoge', {})
+        ])
       }
 
       const vm = new Vue(options)
@@ -651,7 +636,6 @@ describe('i18n', () => {
       })
 
       it('should translate', done => {
-        let vm
         const parentLocales = {
           en: { foo: { bar: 'hello parent' } },
           ja: { foo: { bar: 'こんにちは、親' } }
@@ -669,79 +653,45 @@ describe('i18n', () => {
           ja: { foo: { bar: 'こんにちは、子3' } }
         }
 
-        if (version >= 2) {
-          vm = new Vue({
-            render (h) {
-              return h('div', [
-                h('p', { attrs: { id: 'parent' } }, [this.$t('foo.bar')]),
-                h('child1'),
-                h('child2')
-              ])
-            },
-            locales: parentLocales,
-            components: {
-              child1: {
-                render (h) {
-                  return h('div', [
-                    h('p', { attrs: { id: 'child1' } }, [this.$t('foo.bar')]),
-                    h('child3')
-                  ])
-                },
-                locales: child1Locales,
-                components: {
-                  child3: {
-                    render (h) {
-                      return h('div', [
-                        h('p', { attrs: { id: 'child3' } }, [this.$t('foo.bar')])
-                      ])
-                    },
-                    locales: child3Locales
-                  }
-                }
+        const vm = new Vue({
+          render (h) {
+            return h('div', [
+              h('p', { attrs: { id: 'parent' } }, [this.$t('foo.bar')]),
+              h('child1'),
+              h('child2')
+            ])
+          },
+          locales: parentLocales,
+          components: {
+            child1: {
+              render (h) {
+                return h('div', [
+                  h('p', { attrs: { id: 'child1' } }, [this.$t('foo.bar')]),
+                  h('child3')
+                ])
               },
-              child2: {
-                render (h) {
-                  return h('div', [
-                    h('p', { attrs: { id: 'child2' } }, [this.$t('foo.bar')])
-                  ])
-                },
-                locales: child2Locales
-              }
-            }
-          })
-        } else {
-          vm = new Vue({
-            template: `<div>
-              <p id="parent">{{ $t("foo.bar") }}</p>
-              <child1></child1>
-              <child2></child2>
-            </div>`,
-            locales: parentLocales,
-            components: {
-              child1: {
-                template: `<div>
-                  <p id="child1">{{ $t("foo.bar") }}</p>
-                  <child3></child3>
-                </div>`,
-                locales: child1Locales,
-                components: {
-                  child3: {
-                    template: `<div>
-                      <p id="child3">{{ $t("foo.bar") }}</p>
-                    </div>`,
-                    locales: child3Locales
-                  }
+              locales: child1Locales,
+              components: {
+                child3: {
+                  render (h) {
+                    return h('div', [
+                      h('p', { attrs: { id: 'child3' } }, [this.$t('foo.bar')])
+                    ])
+                  },
+                  locales: child3Locales
                 }
-              },
-              child2: {
-                template: `<div>
-                  <p id="child2">{{ $t("foo.bar") }}</p>
-                </div>`,
-                locales: child2Locales
               }
+            },
+            child2: {
+              render (h) {
+                return h('div', [
+                  h('p', { attrs: { id: 'child2' } }, [this.$t('foo.bar')])
+                ])
+              },
+              locales: child2Locales
             }
-          })
-        }
+          }
+        })
         vm.$mount(el)
 
         const parent = vm.$el.querySelector('#parent')