diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 17806d2..26a3885 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,10 +4,10 @@ on: [push, pull_request]
 jobs:
   build:
     name: test
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-18.04
     strategy:
       matrix:
-        deno-version: [1.28.0,1.27.0]
+        deno-version: [1.28.0, 1.27.0]
     steps:
       - uses: actions/checkout@master
       - name: Setup deno