composer.json

@@ -15,11 +15,6 @@
         }
     ],
     "bin": [ "bin/dataset-info" ],
-    "require": {
-        "php": "^7.4|^8.0",
-        "ext-simplexml": "*",
-        "ext-json": "*"
-    },
     "require-dev": {
         "phpunit/phpunit": "^9.5",
         "phpstan/phpstan": "^1.8"

src/DatasetManager.php

@@ -84,7 +84,7 @@ class DatasetManager
         if (file_exists($fn)) {
             $versions = include $fn;
             foreach ($versions['versions'] as $name=>$version) {
-                self::$packageVersions[$name] = array_key_exists('version',$version) ? $version['version'] : null;
+                self::$packageVersions[$name] = $version['version'];
             }
         }