diff --git a/.github/test.js b/.github/test.js
index 2dfe4e8..304e46a 100644
--- a/.github/test.js
+++ b/.github/test.js
@@ -22,7 +22,7 @@ function installDeps() {
 
   let installCmd = agent === 'yarn' ? `${agent} add` : `${agent} i`
 
-  const packages = isVue27 ? 'vue@v2-alpha' : isVue2 ? `vue@2.6 @vue/composition-api` : 'vue@3'
+  const packages = isVue27 ? 'vue@2.7' : isVue2 ? `vue@2.6 @vue/composition-api` : 'vue@3'
   execSync(`${installCmd} ${packages}`, { cwd: DIR, stdio: 'inherit' })
   execSync(`${installCmd} ${agent === 'yarn' ? `file:${tarball}` : tarball} --force`, { cwd: DIR, stdio: 'inherit' })
 }
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 169acc6..a38a9f8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -33,7 +33,7 @@ jobs:
         node: [14.x, 16.x]
         os: [ubuntu-latest]
         vue: [2.6, 2.7, 3]
-        yarn: [latest, berry]
+        yarn: [latest]
         type: [commonjs, module]
         
     runs-on: ${{ matrix.os }}
diff --git a/lib/index.iife.js b/lib/index.iife.js
index 2179268..085d02c 100644
--- a/lib/index.iife.js
+++ b/lib/index.iife.js
@@ -19,7 +19,9 @@ var VueDemi = (function (VueDemi, Vue, VueCompositionAPI) {
     VueDemi.Vue2 = Vue
     VueDemi.version = Vue.version
     VueDemi.warn = Vue.util.warn
-    VueDemi.hasInjectionContext = () => !!VueDemi.getCurrentInstance()
+    VueDemi.hasInjectionContext = function() {
+      return !!VueDemi.getCurrentInstance()
+    }
     function createApp(rootComponent, rootProps) {
       var vm
       var provide = {}
@@ -72,7 +74,9 @@ var VueDemi = (function (VueDemi, Vue, VueCompositionAPI) {
       VueDemi.Vue = Vue
       VueDemi.Vue2 = Vue
       VueDemi.version = Vue.version
-      VueDemi.hasInjectionContext = () => !!VueDemi.getCurrentInstance()
+      VueDemi.hasInjectionContext = function() {
+        return !!VueDemi.getCurrentInstance()
+      }
     } else {
       console.error('[vue-demi] no VueCompositionAPI instance found, please be sure to import `@vue/composition-api` before `vue-demi`.')
     }
diff --git a/lib/v2.7/index.cjs b/lib/v2.7/index.cjs
index 1dce010..8fa3b68 100644
--- a/lib/v2.7/index.cjs
+++ b/lib/v2.7/index.cjs
@@ -55,4 +55,6 @@ Object.keys(VueModule).forEach(function (key) {
 })
 
 // Not implemented https://github.com/vuejs/core/pull/8111, falls back to getCurrentInstance()
-exports.hasInjectionContext = () => !!VueModule.getCurrentInstance()
+exports.hasInjectionContext = function() {
+  return !!VueModule.getCurrentInstance()
+}
\ No newline at end of file
diff --git a/lib/v2/index.cjs b/lib/v2/index.cjs
index 5f873d2..c3d298e 100644
--- a/lib/v2/index.cjs
+++ b/lib/v2/index.cjs
@@ -29,4 +29,6 @@ exports.install = install
 exports.version = Vue.version
 
 // Not implemented https://github.com/vuejs/core/pull/8111, falls back to getCurrentInstance()
-exports.hasInjectionContext = () => !!VueCompositionAPI.getCurrentInstance()
+exports.hasInjectionContext = function () {
+  return !!VueCompositionAPI.getCurrentInstance()
+}
diff --git a/package.json b/package.json
index 27e4dfc..e362bbe 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-demi",
-  "version": "0.14.6",
+  "version": "0.14.7",
   "engines": {
     "node": ">=12"
   },
@@ -32,7 +32,7 @@
     "scripts"
   ],
   "scripts": {
-    "postinstall": "node ./scripts/postinstall.js",
+    "postinstall": "node -e \"try{require('./scripts/postinstall.js')}catch(e){}\"",
     "release": "npx bumpp --tag --commit --push && npm publish"
   },
   "peerDependencies": {