diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9efca65d..e9c574da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: ['5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+        php: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
 
     name: PHP ${{ matrix.php }}
 
diff --git a/composer.json b/composer.json
index 7e1e6808..3c4d3ba6 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         }
     ],
     "require": {
-        "php": ">=5.2"
+        "php": "~5.6.0 || ~7.0.0 || ~7.1.0 || ~7.2.0 || ~7.3.0 || ~7.4.0 || ~8.0.0 || ~8.1.0"
     },
     "autoload": {
         "psr-0": { "HTMLPurifier": "library/" },