diff --git a/src/Illuminate/Session/Store.php b/src/Illuminate/Session/Store.php
index 34197132595d..635d4c69773b 100755
--- a/src/Illuminate/Session/Store.php
+++ b/src/Illuminate/Session/Store.php
@@ -194,7 +194,7 @@ public function isValidId($id)
      */
     protected function generateSessionId()
     {
-        return sha1(uniqid('', true).Str::random(25).microtime(true));
+        return Str::random(40);
     }
 
     /**