diff --git a/composer.json b/composer.json
index a3ade78..165c7d2 100644
--- a/composer.json
+++ b/composer.json
@@ -13,14 +13,14 @@
         "antimattr/mongodb-migrations" : "*"
     },
     "require": {
-        "php": "^7.1",
+        "php": "^7.1 || ^8.0",
         "ext-mongodb": "*",
-        "mongodb/mongodb": "^1.4",
+        "mongodb/mongodb": "^1.8",
         "symfony/console": "^2.7 || ^3.4 || ^4.0 || ^5.0",
         "symfony/yaml": "^2.7 || ^3.4 || ^4.0 || ^5.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.0",
+        "phpunit/phpunit": "^7.0 || ^8.0",
         "friendsofphp/php-cs-fixer": "^2.0",
         "mikey179/vfsstream": "1.*"
     },
diff --git a/src/AntiMattr/MongoDB/Migrations/Tools/Console/Command/GenerateCommand.php b/src/AntiMattr/MongoDB/Migrations/Tools/Console/Command/GenerateCommand.php
index 7fb80d4..fbdcc2d 100644
--- a/src/AntiMattr/MongoDB/Migrations/Tools/Console/Command/GenerateCommand.php
+++ b/src/AntiMattr/MongoDB/Migrations/Tools/Console/Command/GenerateCommand.php
@@ -23,7 +23,7 @@ class GenerateCommand extends AbstractCommand
 {
     protected static $defaultName = 'mongodb:migrations:generate';
 
-    private static $_template =
+    protected static $_template =
             '<?php
 
 namespace <namespace>;
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Collection/StatisticsTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Collection/StatisticsTest.php
index 977ad5f..7b831cd 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Collection/StatisticsTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Collection/StatisticsTest.php
@@ -10,7 +10,7 @@ class StatisticsTest extends TestCase
     private $collection;
     private $statistics;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->collection = $this->createMock('MongoDB\Collection');
         $this->statistics = new Statistics();
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Configuration/ConfigurationTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Configuration/ConfigurationTest.php
index b8d14c6..9a43e48 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Configuration/ConfigurationTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Configuration/ConfigurationTest.php
@@ -10,7 +10,7 @@ class ConfigurationTest extends TestCase
     private $configuration;
     private $connection;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->connection = $this->createMock('MongoDB\Client');
         $this->configuration = new Configuration($this->connection);
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbortExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbortExceptionTest.php
index 8f75835..d91994d 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbortExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbortExceptionTest.php
@@ -8,7 +8,7 @@ class AbortExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = $this->createMock('AntiMattr\MongoDB\Migrations\Exception\AbortException');
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbstractMigrationsExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbstractMigrationsExceptionTest.php
index 3a6596a..c531fea 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbstractMigrationsExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/AbstractMigrationsExceptionTest.php
@@ -9,7 +9,7 @@ class AbstractMigrationsExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = new AbstractMigrationsExceptionStub();
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/ConfigurationValidationExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/ConfigurationValidationExceptionTest.php
index 3d3dd84..7479879 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/ConfigurationValidationExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/ConfigurationValidationExceptionTest.php
@@ -8,7 +8,7 @@ class ConfigurationValidationExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = $this->createMock('AntiMattr\MongoDB\Migrations\Exception\ConfigurationValidationException');
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/DuplicateVersionExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/DuplicateVersionExceptionTest.php
index 5ec3c9e..5ec3dbf 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/DuplicateVersionExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/DuplicateVersionExceptionTest.php
@@ -8,7 +8,7 @@ class DuplicateVersionExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = $this->createMock('AntiMattr\MongoDB\Migrations\Exception\DuplicateVersionException');
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/IrreversibleExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/IrreversibleExceptionTest.php
index d85ad9b..e2e97de 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/IrreversibleExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/IrreversibleExceptionTest.php
@@ -8,7 +8,7 @@ class IrreversibleExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = $this->createMock('AntiMattr\MongoDB\Migrations\Exception\IrreversibleException');
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/NoMigrationsToExecuteExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/NoMigrationsToExecuteExceptionTest.php
index ce222be..abfef56 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/NoMigrationsToExecuteExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/NoMigrationsToExecuteExceptionTest.php
@@ -8,7 +8,7 @@ class NoMigrationsToExecuteExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = $this->createMock('AntiMattr\MongoDB\Migrations\Exception\NoMigrationsToExecuteException');
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/SkipExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/SkipExceptionTest.php
index d97ecaa..aea82d6 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/SkipExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/SkipExceptionTest.php
@@ -8,7 +8,7 @@ class SkipExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = $this->createMock('AntiMattr\MongoDB\Migrations\Exception\SkipException');
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/UnknownVersionExceptionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/UnknownVersionExceptionTest.php
index 63da089..c73775d 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/UnknownVersionExceptionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Exception/UnknownVersionExceptionTest.php
@@ -8,7 +8,7 @@ class UnknownVersionExceptionTest extends TestCase
 {
     private $exception;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->exception = $this->createMock('AntiMattr\MongoDB\Migrations\Exception\UnknownVersionException');
     }
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/MigrationTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/MigrationTest.php
index e8c7e9c..77b031f 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/MigrationTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/MigrationTest.php
@@ -11,7 +11,7 @@ class MigrationTest extends TestCase
     private $migration;
     private $outputWriter;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->configuration = $this->createMock('AntiMattr\MongoDB\Migrations\Configuration\Configuration');
         $this->outputWriter = $this->createMock('AntiMattr\MongoDB\Migrations\OutputWriter');
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/OutputWriterTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/OutputWriterTest.php
index 49ddf1e..914423c 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/OutputWriterTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/OutputWriterTest.php
@@ -9,7 +9,7 @@ class OutputWriterTest extends TestCase
 {
     private $outputWriter;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->output = $this->createMock('Symfony\Component\Console\Output\OutputInterface');
         $output = $this->output;
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/ExecuteCommandTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/ExecuteCommandTest.php
index c1c9e7b..f132e84 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/ExecuteCommandTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/ExecuteCommandTest.php
@@ -19,7 +19,7 @@ class ExecuteCommandTest extends TestCase
     private $config;
     private $version;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->command = new ExecuteCommand();
         $this->output = $this->createMock('Symfony\Component\Console\Output\OutputInterface');
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/GenerateCommandTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/GenerateCommandTest.php
index a53fa42..81a26cd 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/GenerateCommandTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/GenerateCommandTest.php
@@ -16,7 +16,7 @@ class GenerateCommandTest extends TestCase
     private $output;
     private $config;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->command = new GenerateCommandStub();
         $this->output = $this->createMock('Symfony\Component\Console\Output\OutputInterface');
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/MigrateCommandTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/MigrateCommandTest.php
index 8efbb26..5161b5f 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/MigrateCommandTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/MigrateCommandTest.php
@@ -18,7 +18,7 @@ class MigrateCommandTest extends TestCase
     private $command;
     private $output;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->command = new MigrateCommandStub();
         $this->output = $this->createMock('Symfony\Component\Console\Output\OutputInterface');
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/StatusCommandTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/StatusCommandTest.php
index 265bbb9..a1d1bb5 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/StatusCommandTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/StatusCommandTest.php
@@ -26,7 +26,7 @@ class StatusCommandTest extends TestCase
      */
     private $outputFormatter;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->command = new StatusCommandStub();
         $this->output = $this->createMock('Symfony\Component\Console\Output\OutputInterface');
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/VersionCommandTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/VersionCommandTest.php
index d2bf6f9..f489ed0 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/VersionCommandTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/Tools/Console/Command/VersionCommandTest.php
@@ -19,7 +19,7 @@ class VersionCommandTest extends TestCase
     private $migration;
     private $version;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->command = new VersionCommandStub();
         $this->output = $this->createMock('Symfony\Component\Console\Output\OutputInterface');
diff --git a/tests/AntiMattr/Tests/MongoDB/Migrations/VersionTest.php b/tests/AntiMattr/Tests/MongoDB/Migrations/VersionTest.php
index 6d3c3ca..2b27b35 100644
--- a/tests/AntiMattr/Tests/MongoDB/Migrations/VersionTest.php
+++ b/tests/AntiMattr/Tests/MongoDB/Migrations/VersionTest.php
@@ -19,7 +19,7 @@ class VersionTest extends TestCase
     private $outputWriter;
     private $statistics;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->className = 'AntiMattr\Tests\MongoDB\Migrations\Version20140908000000';
         $this->configuration = $this->createMock('AntiMattr\MongoDB\Migrations\Configuration\Configuration');