diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index db2454c..a80c190 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,6 +37,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+      - name: Install V8
+        run: |
+          brew update
+          brew install v8
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/lib/execjs/support/v8_runner.js b/lib/execjs/support/v8_runner.js
index c57a944..1b2a89c 100644
--- a/lib/execjs/support/v8_runner.js
+++ b/lib/execjs/support/v8_runner.js
@@ -1,7 +1,14 @@
-(function(program, execJS) { execJS(program) })(function() { #{source}
+(function(program, execJS) { execJS(program) })(function(console, setTimeout, setInterval, clearTimeout, clearInterval, setImmediate, clearImmediate) { #{source}
 }, function(program) {
   var output;
   try {
+    delete this.console;
+    delete this.setTimeout;
+    delete this.setInterval;
+    delete this.clearTimeout;
+    delete this.clearInterval;
+    delete this.setImmediate;
+    delete this.clearImmediate;
     result = program();
     if (typeof result == 'undefined' && result !== null) {
       print('["ok"]');