diff --git a/composer.json b/composer.json
index 525fa1c..8d96834 100644
--- a/composer.json
+++ b/composer.json
@@ -5,10 +5,10 @@
   "minimum-stability": "stable",
   "license": "MIT",
   "require": {
-    "symfony/framework-bundle": "^5.0",
+    "symfony/framework-bundle": "^4.4 | ^5.0",
     "rikudou/psr6-dynamo-db": "^2.0",
     "php": "^7.2 | ^8.0",
-    "symfony/cache": "^5.0",
+    "symfony/cache": "^4.4 | ^5.0",
     "ext-json": "*"
   },
   "autoload": {
diff --git a/src/Session/DynamoDbSessionHandler.php b/src/Session/DynamoDbSessionHandler.php
index 20b599b..88482e3 100644
--- a/src/Session/DynamoDbSessionHandler.php
+++ b/src/Session/DynamoDbSessionHandler.php
@@ -60,12 +60,12 @@ public function updateTimestamp($key, $val): bool
         return $this->cache->save($item);
     }
 
-    protected function doRead(string $sessionId): string
+    protected function doRead($sessionId): string
     {
         return (string) $this->getCacheItem($sessionId)->get();
     }
 
-    protected function doWrite(string $sessionId, string $data): bool
+    protected function doWrite($sessionId, $data): bool
     {
         $item = $this->getCacheItem($sessionId);
         $item->set($data);
@@ -74,7 +74,7 @@ protected function doWrite(string $sessionId, string $data): bool
         return $this->cache->save($item);
     }
 
-    protected function doDestroy(string $sessionId): bool
+    protected function doDestroy($sessionId): bool
     {
         return $this->cache->deleteItem($this->getCacheKey($sessionId));
     }