diff --git a/.github/workflows/ubuntu-rvm.yml b/.github/workflows/ubuntu-rvm.yml
deleted file mode 100644
index 2fdf8d9..0000000
--- a/.github/workflows/ubuntu-rvm.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-name: ubuntu-rvm
-
-on: [push, pull_request]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        ruby: [ 'ruby-head' ]
-      fail-fast: false
-    steps:
-    - uses: actions/checkout@master
-    - name: Install packages
-      run: |
-        sudo apt update -qy
-        sudo apt install zlib1g-dev
-    - name: Set up RVM
-      run: |
-        curl -sSL https://get.rvm.io | bash
-    - name: Set up Ruby
-      run: |
-        source $HOME/.rvm/scripts/rvm
-        rvm install ${{ matrix.ruby }} --binary
-        rvm --default use ${{ matrix.ruby }}
-    - name: Set up Bundler
-      run: |
-        source $HOME/.rvm/scripts/rvm
-        gem install bundler --no-document
-    - name: Install dependencies
-      run: |
-        source $HOME/.rvm/scripts/rvm
-        bundle install
-    - name: Run test
-      run: |
-        source $HOME/.rvm/scripts/rvm
-        rake
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 3ac0e45..280a2f9 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -1,4 +1,4 @@
-name: ubuntu
+name: test
 
 on: [push, pull_request]
 
@@ -7,15 +7,15 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '2.6.x', '2.5.x', '2.4.x' ]
+        ruby: [ 2.6, 2.5, 2.4, head ]
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v2
     - name: Install packages
       run: |
         sudo apt update -qy
         sudo apt install zlib1g-dev
     - name: Set up Ruby
-      uses: actions/setup-ruby@v1
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
     - name: Set up Bundler