diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index a8fd4a9..111080f 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -14,11 +14,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-20.04, ubuntu-18.04, macos-10.15, windows-2019 ]
-        ruby: [ head, 3.0, 2.7, 2.6, 2.5, 2.4, jruby, truffleruby-head ]
+        os: [ ubuntu-20.04, ubuntu-18.04, macos-11, windows-2019 ]
+        ruby: [ head, '3.0', 2.7, 2.6, 2.5, 2.4, jruby, truffleruby-head ]
         include:
-          - { os: ubuntu-16.04, ruby: 3.0 }
-          - { os: ubuntu-16.04, ruby: 2.4 }
+          - { os: ubuntu-22.04, ruby: head  }
+          - { os: ubuntu-22.04, ruby: 3.1   }
+          - { os: windows-2022, ruby: ucrt  }
+          - { os: windows-2022, ruby: 3.1   }
         exclude:
           - { os: windows-2019, ruby: head  }
           - { os: windows-2019, ruby: jruby }