diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 4475470..9f91afa 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -10,10 +10,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-        - '2.3'
-        - '2.4'
-        - '2.5'
-        - '2.6'
+        - '1.9'
         - '2.7'
         - '3.0'
         - '3.1'
@@ -29,27 +26,11 @@ jobs:
         ruby-version: "${{ matrix.ruby }}"
         bundler-cache: true
     - run: bundle exec rspec
-  legacy:
-    runs-on: ubuntu-latest
-    container: ${{ matrix.container }}
-    strategy:
-      matrix:
-        container:
-        - rspec/ci:1.9.3
-        - rspec/ci:2.0.0
-        - ruby:2.1
-        - ruby:2.2
-      fail-fast: false
-    steps:
-    - uses: actions/checkout@v4
-    - run: bundle install
-    - run: bundle exec rspec --format documentation
   windows:
     runs-on: windows-latest
     strategy:
       matrix:
         ruby:
-        - '2.6'
         - '2.7'
         - '3.0'
         - '3.1'