diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7993cd9..e6d0a6c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,12 +6,13 @@ on:
 
 jobs:
   PHPUnit:
+    name: PHPUnit (PHP ${{ matrix.php }} on ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os:
-          - ubuntu-latest
-          - windows-latest
+          - ubuntu-20.04
+          - windows-2019
         php:
           - 8.1
           - 8.0
@@ -26,11 +27,11 @@ jobs:
           - 5.3
     steps:
       - uses: actions/checkout@v2
-      - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+      - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
           extensions: sockets
+          coverage: xdebug
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
         if: ${{ matrix.php >= 7.3 }}
diff --git a/README.md b/README.md
index c11b179..7c67041 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # clue/socket-raw
 
-[![CI status](https://github.com/clue/socket-raw/workflows/CI/badge.svg)](https://github.com/clue/socket-raw/actions)
+[![CI status](https://github.com/clue/socket-raw/actions/workflows/ci.yml/badge.svg)](https://github.com/clue/socket-raw/actions)
 [![installs on Packagist](https://img.shields.io/packagist/dt/clue/socket-raw?color=blue&label=installs%20on%20Packagist)](https://packagist.org/packages/clue/socket-raw)
 
 Simple and lightweight OOP wrapper for PHP's low-level sockets extension (ext-sockets).