diff --git a/db/migrations/2018_10_01_000000_create_users_tables.php b/db/migrations/2018_10_01_000000_create_users_tables.php
index c7937bed..0d6e0a3b 100644
--- a/db/migrations/2018_10_01_000000_create_users_tables.php
+++ b/db/migrations/2018_10_01_000000_create_users_tables.php
@@ -160,8 +160,7 @@ class CreateUsersTables extends Migration
                 'User',
                 'UID',
                 'users',
-                'id',
-                'unsignedInteger'
+                'id'
             );
         }
 
diff --git a/db/migrations/2019_10_15_000000_create_news_table.php b/db/migrations/2019_10_15_000000_create_news_table.php
index e4c48db0..99448c5d 100644
--- a/db/migrations/2019_10_15_000000_create_news_table.php
+++ b/db/migrations/2019_10_15_000000_create_news_table.php
@@ -38,8 +38,7 @@ class CreateNewsTable extends Migration
                 'PreviousNews',
                 'ID',
                 'news',
-                'id',
-                'unsignedInteger'
+                'id'
             );
             $this->schema->drop('PreviousNews');
         }
@@ -59,8 +58,7 @@ class CreateNewsTable extends Migration
             'new_news',
             'id',
             'News',
-            'ID',
-            'unsignedInteger'
+            'ID'
         );
 
         $this->schema->drop('new_news');
diff --git a/db/migrations/2019_11_12_000000_create_news_comments_table.php b/db/migrations/2019_11_12_000000_create_news_comments_table.php
index ac080c38..66a3b96a 100644
--- a/db/migrations/2019_11_12_000000_create_news_comments_table.php
+++ b/db/migrations/2019_11_12_000000_create_news_comments_table.php
@@ -30,8 +30,7 @@ class CreateNewsCommentsTable extends Migration
                 'NewsComments',
                 'ID',
                 'news_comments',
-                'id',
-                'unsignedInteger'
+                'id'
             );
             $this->schema->drop('NewsComments');
         }
@@ -48,8 +47,7 @@ class CreateNewsCommentsTable extends Migration
             'news_comments',
             'id',
             'NewsComments',
-            'ID',
-            'unsignedInteger'
+            'ID'
         );
 
         $this->schema->drop('news_comments');
diff --git a/db/migrations/2019_11_25_000000_create_messages_table.php b/db/migrations/2019_11_25_000000_create_messages_table.php
index e2c0f253..ce1eee9c 100644
--- a/db/migrations/2019_11_25_000000_create_messages_table.php
+++ b/db/migrations/2019_11_25_000000_create_messages_table.php
@@ -38,8 +38,7 @@ class CreateMessagesTable extends Migration
                 'PreviousMessages',
                 'ID',
                 'messages',
-                'id',
-                'unsignedInteger'
+                'id'
             );
             $this->schema->drop('PreviousMessages');
         }
@@ -59,8 +58,7 @@ class CreateMessagesTable extends Migration
             'new_messages',
             'id',
             'Messages',
-            'ID',
-            'unsignedInteger'
+            'ID'
         );
 
         $this->schema->drop('new_messages');
diff --git a/db/migrations/2019_11_29_000000_create_questions_table.php b/db/migrations/2019_11_29_000000_create_questions_table.php
index d0674931..f39965e4 100644
--- a/db/migrations/2019_11_29_000000_create_questions_table.php
+++ b/db/migrations/2019_11_29_000000_create_questions_table.php
@@ -37,8 +37,7 @@ class CreateQuestionsTable extends Migration
                 'PreviousQuestions',
                 'QID',
                 'questions',
-                'id',
-                'unsignedInteger'
+                'id'
             );
             $this->schema->drop('PreviousQuestions');
         }
@@ -58,8 +57,7 @@ class CreateQuestionsTable extends Migration
             'new_questions',
             'id',
             'Questions',
-            'QID',
-            'unsignedInteger'
+            'QID'
         );
 
         $this->schema->drop('new_questions');
diff --git a/db/migrations/ChangesReferences.php b/db/migrations/ChangesReferences.php
index b5b39ac3..95420f19 100644
--- a/db/migrations/ChangesReferences.php
+++ b/db/migrations/ChangesReferences.php
@@ -14,8 +14,13 @@ trait ChangesReferences
      * @param string $targetColumn
      * @param string $type
      */
-    protected function changeReferences($fromTable, $fromColumn, $targetTable, $targetColumn, $type)
-    {
+    protected function changeReferences(
+        string $fromTable,
+        string $fromColumn,
+        string $targetTable,
+        string $targetColumn,
+        string $type = 'unsignedInteger'
+    ) {
         $references = $this->getReferencingTables($fromTable, $fromColumn);
 
         foreach ($references as $reference) {
@@ -41,9 +46,10 @@ trait ChangesReferences
     /**
      * @param string $table
      * @param string $column
+     *
      * @return array
      */
-    protected function getReferencingTables($table, $column): array
+    protected function getReferencingTables(string $table, string $column): array
     {
         return $this->schema
             ->getConnection()