diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 8edb0ee..81179d8 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -28,8 +28,14 @@ jobs:
       - name: Validate composer.json and composer.lock
         run: composer validate --strict
 
+      - name: Lint (syntax check only)
+        if: matrix.php-versions == '7.1' || matrix.php-versions == '7.2'
+        run: find src tests -name '*.php' -print0 | xargs -0 -n1 php -l
+
       - name: Install Dependencies
+        if: matrix.php-versions != '7.1' && matrix.php-versions != '7.2'
         run: composer install --no-interaction --prefer-dist --optimize-autoloader
 
       - name: Tests
+        if: matrix.php-versions != '7.1' && matrix.php-versions != '7.2'
         run: ./vendor/bin/phpunit ./tests
diff --git a/README.md b/README.md
index 44ffeba..ec1acec 100644
--- a/README.md
+++ b/README.md
@@ -191,6 +191,15 @@ Laravel and PHP developers!
 
 Contributions are very welcome! There isn't a formal guide, but throw in an Issue or PR, and we'll go from there.
 
+### Running the tests
+
+```bash
+composer install
+./vendor/bin/phpunit ./tests
+```
+
+PHP 7.1 and 7.2 are still supported at runtime, but PHPUnit's current dev-dependency chain no longer installs on them. CI syntax-checks the source on those versions via `php -l` instead of running the test suite — enough to catch any code that wouldn't parse on PHP 7.1/7.2. The full test suite runs on PHP 7.3 and later.
+
 ## Security Vulnerabilities
 
 Please report any security vulnerabilities via the [GitHub project](https://github.com/valorin/random)
diff --git a/composer.json b/composer.json
index bfaa9fd..177e168 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     },
     "require-dev": {
         "illuminate/support": "^5.0 || ^10.0 || ^11.0 || ^12.0",
-        "phpunit/phpunit": "^7.0 || ^9.6 || ^10.5"
+        "phpunit/phpunit": "^7.5 || ^9.6 || ^10.5"
     },
     "autoload": {
         "psr-4": {