Merge pull request #59 from willnet/update-ci-env

Update CI environment

Author: amatsuda

.github/workflows/main.yml

@@ -9,23 +9,22 @@ jobs:
 
       matrix:
         os:
-         - macos-10.15
-         - macos-11.0
+         - macos-14
+         - macos-15
 
         ruby-version:
-          - '2.3'
-          - '2.4'
-          - '2.5'
           - '2.6'
           - '2.7'
           - '3.0'
           - '3.1'
           - '3.2'
+          - '3.3'
+          - '3.4'
           - ruby-head
 
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
 
       - uses: ruby/setup-ruby@v1
         with: