diff --git a/src/Console/CreateDatabaseCommand.php b/src/Console/CreateDatabaseCommand.php
index f9431db..019df9c 100644
--- a/src/Console/CreateDatabaseCommand.php
+++ b/src/Console/CreateDatabaseCommand.php
@@ -14,7 +14,7 @@ use Symfony\Component\Console\Question\Question;
 class CreateDatabaseCommand extends Command
 {
     public function __construct(
-        private DatabaseService $db,
+        private readonly DatabaseService $db,
     )
     {
         parent::__construct();
diff --git a/src/Console/DeleteDatabaseCommand.php b/src/Console/DeleteDatabaseCommand.php
index 3fdbad8..110651f 100644
--- a/src/Console/DeleteDatabaseCommand.php
+++ b/src/Console/DeleteDatabaseCommand.php
@@ -16,7 +16,7 @@ class DeleteDatabaseCommand extends Command
     use SelectDatabaseQuestion;
 
     public function __construct(
-        private DatabaseService $db,
+        private readonly DatabaseService $db,
     )
     {
         parent::__construct();
diff --git a/src/Console/ListDatabasesCommand.php b/src/Console/ListDatabasesCommand.php
index 160ed80..235cf02 100644
--- a/src/Console/ListDatabasesCommand.php
+++ b/src/Console/ListDatabasesCommand.php
@@ -12,7 +12,7 @@ use Symfony\Component\Console\Output\OutputInterface;
 class ListDatabasesCommand extends Command
 {
     public function __construct(
-        private DatabaseService $db,
+        private readonly DatabaseService $db,
     )
     {
         parent::__construct();
diff --git a/src/Console/ListUsersCommand.php b/src/Console/ListUsersCommand.php
index 6564884..7f0fda2 100644
--- a/src/Console/ListUsersCommand.php
+++ b/src/Console/ListUsersCommand.php
@@ -12,7 +12,7 @@ use Symfony\Component\Console\Output\OutputInterface;
 class ListUsersCommand extends Command
 {
     public function __construct(
-        private DatabaseService $db,
+        private readonly DatabaseService $db,
     )
     {
         parent::__construct();
diff --git a/src/Console/PurgeDatabaseCommand.php b/src/Console/PurgeDatabaseCommand.php
index 0a7f4b5..0b7432a 100644
--- a/src/Console/PurgeDatabaseCommand.php
+++ b/src/Console/PurgeDatabaseCommand.php
@@ -16,7 +16,7 @@ class PurgeDatabaseCommand extends Command
     use SelectDatabaseQuestion;
 
     public function __construct(
-        private DatabaseService $db,
+        private readonly DatabaseService $db,
     )
     {
         parent::__construct();
diff --git a/src/Console/RestoreDatabaseCommand.php b/src/Console/RestoreDatabaseCommand.php
index b1272d8..12397a6 100644
--- a/src/Console/RestoreDatabaseCommand.php
+++ b/src/Console/RestoreDatabaseCommand.php
@@ -19,8 +19,8 @@ class RestoreDatabaseCommand extends Command
     use SelectDatabaseQuestion;
 
     public function __construct(
-        private DatabaseService $db,
-        private BackupService $bs,
+        private readonly DatabaseService $db,
+        private readonly BackupService   $bs,
     )
     {
         parent::__construct();
diff --git a/src/Service/MysqliConnection.php b/src/Service/MysqliConnection.php
index 25952d0..ba763ce 100644
--- a/src/Service/MysqliConnection.php
+++ b/src/Service/MysqliConnection.php
@@ -2,6 +2,7 @@
 
 namespace App\Service;
 
+use Exception;
 use mysqli;
 
 class MysqliConnection
@@ -12,7 +13,7 @@ class MysqliConnection
     {
         $this->connection = new mysqli($credentials->getHostname(), $credentials->getUser(), $credentials->getPassword());
         if ($this->connection->connect_error) {
-            throw new \Exception("Connection failed: " . $this->connection->connect_error);
+            throw new Exception("Connection failed: " . $this->connection->connect_error);
         }
     }