diff --git a/composer.json b/composer.json
index 1036b4a13..70e54215d 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=5.4",
+        "php": ">=7.0",
         "ext-pdo": "*",
         "doctrine/collections": "~1.2",
         "doctrine/dbal": ">=2.5-dev,<2.7-dev",
diff --git a/lib/Doctrine/ORM/UnitOfWork.php b/lib/Doctrine/ORM/UnitOfWork.php
index fcbd3ab94..3fe6fa08c 100644
--- a/lib/Doctrine/ORM/UnitOfWork.php
+++ b/lib/Doctrine/ORM/UnitOfWork.php
@@ -408,7 +408,7 @@ class UnitOfWork implements PropertyChangedListener
             }
 
             $conn->commit();
-        } catch (Exception $e) {
+        } catch (\Throwable $e) {
             $this->em->close();
             $conn->rollback();