diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7047d97f2..0d2e11684 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,13 +7,43 @@ on:
     branches: [ master ]
 
 jobs:
-  tests:
+  outdated:
+    runs-on: ubuntu-latest
+    container: setupphp/node@sha256:9271c0a914deb70c1717ec113410c9d43e48123d0ed398bb696f00f4f0ef15ba
+
+    strategy:
+      matrix:
+        php-version:
+          - "8.1"
+
+    steps:
+    - uses: "actions/checkout@v3"
+    - uses: "shivammathur/setup-php@v2"
+      with:
+        php-version: ${{ matrix.php-version }}
+
+    - name: Cache Composer packages
+      id: composer-cache
+      uses: actions/cache@v3
+      with:
+        path: vendor
+        key: php-outdated
+
+    - name: Install Composer dependencies
+      run: composer install --prefer-dist --no-progress
+
+    - name: Run test suite
+      run: composer run-script test
+
+  current:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         php-version:
           - "8.1"
+          - "8.2"
           - "8.3"
+          - "8.4"
 
     steps:
     - uses: "actions/checkout@v3"
@@ -29,7 +59,7 @@ jobs:
       uses: actions/cache@v3
       with:
         path: vendor
-        key: php-${{ matrix.php-version }}-${{ hashFiles('**/composer.json') }}
+        key: php-${{ matrix.php-version }}
 
     - name: Install Composer dependencies
       run: composer install --prefer-dist --no-progress
diff --git a/composer.json b/composer.json
index 2c9305dbb..85232092d 100644
--- a/composer.json
+++ b/composer.json
@@ -6,13 +6,13 @@
 	"keywords": ["bbcode","bbcodes","blog","censor","embed","emoji","emoticons","engine","forum","html","markdown","markup","media","parser","shortcodes"],
 	"license": "MIT",
 	"require": {
-		"php":        "~8.1.22 || ~8.2.9 || ^8.3",
+		"php":        "^8.1",
 		"ext-dom":    "*",
 		"ext-filter": "*",
 		"lib-pcre":   ">=8.13",
 
 		"s9e/regexp-builder": "^1.4",
-		"s9e/sweetdom":       "^3.0"
+		"s9e/sweetdom":       "^3.3"
 	},
 	"require-dev": {
 		"code-lts/doctum":       "*",
diff --git a/src/Utils/ParsedDOM/Document.php b/src/Utils/ParsedDOM/Document.php
index 1ebf02453..f984641cc 100644
--- a/src/Utils/ParsedDOM/Document.php
+++ b/src/Utils/ParsedDOM/Document.php
@@ -8,7 +8,7 @@
 namespace s9e\TextFormatter\Utils\ParsedDOM;
 
 use const LIBXML_NSCLEAN, SORT_STRING, false;
-use function ksort, substr, strpos;
+use function class_alias, class_exists, ksort, substr, strpos;
 use s9e\SweetDOM\Document as SweetDocument;
 use s9e\TextFormatter\Configurator\Validators\TagName;
 use s9e\TextFormatter\Configurator\Validators\AttributeName;
@@ -26,6 +26,11 @@ public function __construct(string $version = '1.0', string $encoding = 'utf-8')
 	{
 		parent::__construct($version, $encoding);
 
+		// Create an alias to whichever SweetDOM\Element subclass is used on current PHP version
+		if (!class_exists(SweetElement::class, false))
+		{
+			class_alias($this->getNodesNamespace() . '\\Element', SweetElement::class, false);
+		}
 		$this->registerNodeClass('DOMElement', Element::class);
 	}
 
diff --git a/src/Utils/ParsedDOM/Element.php b/src/Utils/ParsedDOM/Element.php
index 8751611cc..54f88dd6b 100644
--- a/src/Utils/ParsedDOM/Element.php
+++ b/src/Utils/ParsedDOM/Element.php
@@ -10,8 +10,8 @@
 use DOMNode;
 use const SORT_STRING;
 use function count, ksort, preg_match;
-use s9e\SweetDOM\Element as SweetElement;
 
+// This requires the SweetElement class to be aliased to the correct s9e\SweetDOM\Element subclass
 class Element extends SweetElement
 {
 	/**
diff --git a/tests/Configurator/Helpers/TemplateModifierTest.php b/tests/Configurator/Helpers/TemplateModifierTest.php
index 75b165035..e578854c9 100644
--- a/tests/Configurator/Helpers/TemplateModifierTest.php
+++ b/tests/Configurator/Helpers/TemplateModifierTest.php
@@ -122,7 +122,7 @@ function ($m)
 				'/\\$[0-9]+/',
 				function ($m, $node)
 				{
-					return ['literal', get_class($node)];
+					return ['literal', preg_replace('(SweetDOM\\\\\\K.*\\\\)', '', get_class($node))];
 				},
 				'<b id="s9e\\SweetDOM\\Attr">s9e\\SweetDOM\\Text</b>'
 			],