diff --git a/migrations/Version20141128195430.php b/migrations/Version20141128195430.php
index 9de4c37b1..b83d99a6a 100644
--- a/migrations/Version20141128195430.php
+++ b/migrations/Version20141128195430.php
@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -10,7 +10,7 @@ use Doctrine\DBAL\Schema\Schema;
  */
 class Version20141128195430 extends AbstractMigration
 {
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->addSql("CREATE SEQUENCE CustomField_id_seq INCREMENT BY 1 MINVALUE 1 START 1;");
         $this->addSql("CREATE SEQUENCE CustomFieldsDefaultGroup_id_seq INCREMENT BY 1 MINVALUE 1 START 1;");
@@ -26,7 +26,7 @@ class Version20141128195430 extends AbstractMigration
 
     }
 
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         // this down() migration is auto-generated, please modify it to your needs
 
diff --git a/migrations/Version20150224164531.php b/migrations/Version20150224164531.php
index a4d3771ad..73226c2fe 100644
--- a/migrations/Version20150224164531.php
+++ b/migrations/Version20150224164531.php
@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -10,12 +10,12 @@ use Doctrine\DBAL\Schema\Schema;
  */
 class Version20150224164531 extends AbstractMigration
 {
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->addSql('ALTER TABLE customfieldsgroup ADD options JSON DEFAULT \'{}\'::json');
     }
 
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->addSql('ALTER TABLE CustomFieldsGroup DROP options');
     }
diff --git a/migrations/Version20151210155904.php b/migrations/Version20151210155904.php
index f3d9eadf3..3576eb6c1 100644
--- a/migrations/Version20151210155904.php
+++ b/migrations/Version20151210155904.php
@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -13,7 +13,7 @@ class Version20151210155904 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         // this up() migration is auto-generated, please modify it to your needs
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
@@ -24,7 +24,7 @@ class Version20151210155904 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         // this down() migration is auto-generated, please modify it to your needs
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
diff --git a/migrations/Version20151210205610.php b/migrations/Version20151210205610.php
index 01cb61728..e3d3b84c1 100644
--- a/migrations/Version20151210205610.php
+++ b/migrations/Version20151210205610.php
@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -13,7 +13,7 @@ class Version20151210205610 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 
@@ -35,7 +35,7 @@ class Version20151210205610 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         // this down() migration is auto-generated, please modify it to your needs
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');