diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e5ea799..6e7fa2d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,8 +12,10 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - "macos-11"
+          - "macos-11" # deprecated by GitHub
           - "macos-12"
+          - "macos-13"
+          - "macos-14" # arm64
           - "ubuntu-20.04"
         ruby:
           - "truffleruby+graalvm"
@@ -43,12 +45,15 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - "macos-11"
+          - "macos-11" # deprecated by GitHub
           - "macos-12"
+          - "macos-13"
+          - "macos-14" # arm64
         ruby:
-          - "ruby-3.0"
+          - "ruby-3.0" # EOL as of 2024-04-23
           - "ruby-3.1"
           - "ruby-3.2"
+          - "ruby-3.3"
 
     name: ${{ matrix.os }} - ${{ matrix.ruby }}
     runs-on: ${{ matrix.os }}
@@ -69,9 +74,10 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
-          - "3.0"
+          - "3.0" # EOL as of 2024-04-23
           - "3.1"
           - "3.2"
+          - "3.3"
         platform:
           - "amd64"
           - "arm64"