diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 74349bf..c04c3f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,12 +12,12 @@ jobs:
       - uses: php-actions/composer@v6
         with:
           version: 2
-          php_version: "7.4"
+          php_version: "8.1"
 
       - name: PHPUnit Tests
         uses: php-actions/phpunit@v3
         with:
           version: 9
-          php_version: "7.4"
+          php_version: "8.1"
           configuration: phpunit.xml.dist
           bootstrap: vendor/autoload.php
diff --git a/composer.json b/composer.json
index 4efd88a..1652c33 100755
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "php": ">=7.3",
+        "php": "^8.1",
         "naucon/utility": "~1.0",
         "naucon/registry": "~1.0",
         "doctrine/common": "^3.0.3"
diff --git a/src/Provider/SessionBag.php b/src/Provider/SessionBag.php
index df0a937..2e66ace 100644
--- a/src/Provider/SessionBag.php
+++ b/src/Provider/SessionBag.php
@@ -9,7 +9,8 @@
  */
 namespace Naucon\Storage\Provider;
 
-use Symfony\Component\HttpFoundation\Session\Attribute\NamespacedAttributeBag;
+
+use Naucon\Storage\Session\AttributeBag\LegacyNamespacedAttributeBag;
 
 /**
  * Class SessionBag
@@ -17,7 +18,7 @@
  * @package Naucon\Storage\Provider
  * @author Sven Sanzenbacher
  */
-class SessionBag extends NamespacedAttributeBag
+class SessionBag extends LegacyNamespacedAttributeBag
 {
     /**
      * @var     string      default session storage key
diff --git a/src/Session/AttributeBag/LegacyNamespacedAttributeBag.php b/src/Session/AttributeBag/LegacyNamespacedAttributeBag.php
new file mode 100644
index 0000000..99fb719
--- /dev/null
+++ b/src/Session/AttributeBag/LegacyNamespacedAttributeBag.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace Naucon\Storage\Session\AttributeBag;
+
+use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
+use function array_key_exists;
+use function count;
+
+class LegacyNamespacedAttributeBag extends AttributeBag
+{
+    private string $namespaceCharacter;
+
+    /**
+     * @param string $storageKey         Session storage key
+     * @param string $namespaceCharacter Namespace character to use in keys
+     */
+    public function __construct(string $storageKey = '_sf2_attributes', string $namespaceCharacter = '/')
+    {
+        $this->namespaceCharacter = $namespaceCharacter;
+        parent::__construct($storageKey);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function has($name): bool
+    {
+        $attributes = $this->resolveAttributePath($name);
+        $name = $this->resolveKey($name);
+
+        if (null === $attributes) {
+            return false;
+        }
+
+        return array_key_exists($name, $attributes);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function get($name, $default = null): mixed
+    {
+        $attributes = $this->resolveAttributePath($name);
+        $name = $this->resolveKey($name);
+
+        if (null === $attributes) {
+            return $default;
+        }
+
+        return array_key_exists($name, $attributes) ? $attributes[$name] : $default;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function set($name, $value): void
+    {
+        $attributes = &$this->resolveAttributePath($name, true);
+        $name = $this->resolveKey($name);
+        $attributes[$name] = $value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function remove($name): mixed
+    {
+        $retval = null;
+        $attributes = &$this->resolveAttributePath($name);
+        $name = $this->resolveKey($name);
+        if (null !== $attributes && array_key_exists($name, $attributes)) {
+            $retval = $attributes[$name];
+            unset($attributes[$name]);
+        }
+
+        return $retval;
+    }
+
+    /**
+     * Resolves a path in attributes property and returns it as a reference.
+     *
+     * This method allows structured namespacing of session attributes.
+     *
+     * @param string $name         Key name
+     * @param bool   $writeContext Write context, default false
+     *
+     * @return array|null
+     */
+    protected function &resolveAttributePath(string $name, bool $writeContext = false): ?array
+    {
+        $array = &$this->attributes;
+        $name = (str_starts_with($name, $this->namespaceCharacter)) ? substr($name, 1) : $name;
+
+        // Check if there is anything to do, else return
+        if (!$name) {
+            return $array;
+        }
+
+        $parts = explode($this->namespaceCharacter, $name);
+        if (count($parts) < 2) {
+            if (!$writeContext) {
+                return $array;
+            }
+
+            $array[$parts[0]] = [];
+
+            return $array;
+        }
+
+        unset($parts[count($parts) - 1]);
+
+        foreach ($parts as $part) {
+            if (null !== $array && !array_key_exists($part, $array)) {
+                if (!$writeContext) {
+                    $null = null;
+
+                    return $null;
+                }
+
+                $array[$part] = [];
+            }
+
+            $array = &$array[$part];
+        }
+
+        return $array;
+    }
+
+    /**
+     * Resolves the key from the name.
+     *
+     * This is the last part in a dot separated string.
+     *
+     * @return string
+     */
+    protected function resolveKey(string $name): string
+    {
+        if (false !== $pos = strrpos($name, $this->namespaceCharacter)) {
+            $name = substr($name, $pos + 1);
+        }
+
+        return $name;
+    }
+}