diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c8b263d5..93035275 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,6 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-latest"]
         ruby: ["ruby-head", "3.3", "3.2", "3.1", "3.0", "2.7", "2.6"]
         rubyopt: [""]
         rack: ["~> 3.1"]
@@ -30,7 +29,7 @@ jobs:
     env:
       RACK_VERSION: "${{ matrix.rack }}"
       RUBYOPT: "${{ matrix.rubyopt }}"
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - name: Check out code
         uses: actions/checkout@v4
@@ -42,7 +41,7 @@ jobs:
           bundler-cache: true
 
       - name: Install packages
-        run: sudo apt-get install -y ragel socat netcat
+        run: sudo apt-get install -y ragel socat netcat-openbsd
 
       - name: Tests Rack ${{ matrix.rack }} ${{ matrix.rubyopt }}
         run: bundle exec rake