diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d610869..7a89a73 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,14 +1,18 @@
 on:
-  - push
-  - pull_request
+  push:
+    branches:
+      - master
+      - "*-stable"
+      - "*/ci-check"
+  pull_request: {}
 
 jobs:
   build:
     strategy:
       matrix:
         os: [ 'ubuntu-latest' ]
-        ruby: [ "3.0", "2.7", "2.6", "2.5" ]
-        opal: [ "1.0.3", "1.1.0" ]
+        ruby: [ "head", "3.1", "3.0", "2.7", "2.6" ]
+        opal: [ "~>1.0.0a", "~>1.1.0a", "~>1.3.0a", "~>1.4.0a"]
 
     runs-on: ${{ matrix.os }}
 
diff --git a/spec/tilt/opal_spec.rb b/spec/tilt/opal_spec.rb
index cbcc498..8dacfde 100644
--- a/spec/tilt/opal_spec.rb
+++ b/spec/tilt/opal_spec.rb
@@ -21,7 +21,7 @@
     template = described_class.new('./spec/fixtures/opal_file.rb', :build=>true)
     output = template.render
     expect(output).to include('"hi from opal!"')
-    expect(output).to include('self.$require("corelib/runtime");')
+    expect(output).to include('.$require("corelib/runtime");')
   end
 
   it "support :builder option" do
@@ -31,7 +31,7 @@
     2.times do
       output = template.render
       expect(output.scan(/hi from opal!/).length).to eql(1)
-      expect(output).not_to include('self.$require("corelib/runtime");')
+      expect(output).not_to include('.$require("corelib/runtime");')
     end
   end
 end