diff --git a/.travis.yml b/.travis.yml
index 9b3ebd0..3ef166e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,6 @@
 language: php
 php:
-  - 5.5
   - 5.6
-  - hhvm
   - 7
 script:
   - phpunit -c tests/phpunit.xml --coverage-clover=coverage.clover
diff --git a/src/Collection.php b/src/Collection.php
index ae76f64..a8e3451 100644
--- a/src/Collection.php
+++ b/src/Collection.php
@@ -103,6 +103,8 @@ public function migrate($direction = MigrationInterface::DIRECTION_UP)
                 $result->attach($item);
             } catch (AlreadyMigratedException $e) {
                 /** we will not execute migrations that are already executed */
+            } catch (NotReadyToMigrateException $e) {
+                /** we will not execute migrations that are not ready to be executed */
             }
         }
         
diff --git a/src/NotReadyToMigrateException.php b/src/NotReadyToMigrateException.php
new file mode 100644
index 0000000..b8d17fc
--- /dev/null
+++ b/src/NotReadyToMigrateException.php
@@ -0,0 +1,12 @@
+<?php
+namespace Genkgo\Migrations;
+
+use RuntimeException;
+
+/**
+ * Class NotReadyToMigrateException
+ * @package Genkgo\Migrations
+ */
+class NotReadyToMigrateException extends RuntimeException
+{
+}