diff --git a/.travis.yml b/.travis.yml
index bcd5238..f9a6132 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -44,4 +44,4 @@ script:
 
   # Validate the composer.json file.
   # @link https://getcomposer.org/doc/03-cli.md#validate
-  - composer validate --no-check-all --with-dependencies --strict
+  - composer validate --no-check-all --strict
diff --git a/composer.json b/composer.json
index b936376..1b60705 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     "source" : "https://github.com/PHPCompatibility/PHPCompatibilityWP"
   },
   "require" : {
-    "phpcompatibility/php-compatibility" : "*"
+    "phpcompatibility/php-compatibility" : "^8.1"
   },
   "suggest" : {
     "dealerdirect/phpcodesniffer-composer-installer": "^0.4.3 || This Composer plugin will sort out the PHPCS 'installed_paths' automatically.",