diff --git a/VERSION b/VERSION
index 5d7c78b..d1e9cf3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v3.6.4
+v3.7.0
diff --git a/adapters/GammuAdapter.php b/adapters/GammuAdapter.php
index f1c15e4..eb4ff9f 100644
--- a/adapters/GammuAdapter.php
+++ b/adapters/GammuAdapter.php
@@ -280,6 +280,7 @@ namespace adapters;
             $command_parts = [
                 PWD . '/bin/gammu_get_unread_sms.py',
                 escapeshellarg($this->data['config_file']),
+                '--delete'
             ];
 
             $return = $this->exec_command($command_parts);