diff --git a/src/Monolog/Formatter/ElasticaFormatter.php b/src/Monolog/Formatter/ElasticaFormatter.php
index 128e07ab..c6f3c8e1 100644
--- a/src/Monolog/Formatter/ElasticaFormatter.php
+++ b/src/Monolog/Formatter/ElasticaFormatter.php
@@ -65,7 +65,7 @@ class ElasticaFormatter extends NormalizerFormatter
 
     /**
      * Convert a log message into an Elastica Document
-     * @param  array   $record
+     * @param  array    $record
      * @return Document
      */
     protected function getDocument(array $record): Document
diff --git a/src/Monolog/Formatter/ElasticsearchFormatter.php b/src/Monolog/Formatter/ElasticsearchFormatter.php
index 1667f2cc..84affef3 100644
--- a/src/Monolog/Formatter/ElasticsearchFormatter.php
+++ b/src/Monolog/Formatter/ElasticsearchFormatter.php
@@ -32,7 +32,7 @@ class ElasticsearchFormatter extends NormalizerFormatter
 
     /**
      * @param string $index Elasticsearch index name
-     * @param string $type Elasticsearch record type
+     * @param string $type  Elasticsearch record type
      */
     public function __construct(string $index, string $type)
     {
diff --git a/src/Monolog/Handler/ElasticaHandler.php b/src/Monolog/Handler/ElasticaHandler.php
index 4a444b85..78a8d1ea 100644
--- a/src/Monolog/Handler/ElasticaHandler.php
+++ b/src/Monolog/Handler/ElasticaHandler.php
@@ -81,6 +81,7 @@ class ElasticaHandler extends AbstractProcessingHandler
         if ($formatter instanceof ElasticaFormatter) {
             return parent::setFormatter($formatter);
         }
+
         throw new \InvalidArgumentException('ElasticaHandler is only compatible with ElasticaFormatter');
     }
 
diff --git a/src/Monolog/Handler/ElasticsearchHandler.php b/src/Monolog/Handler/ElasticsearchHandler.php
index 7d5d3a87..6d0021b9 100644
--- a/src/Monolog/Handler/ElasticsearchHandler.php
+++ b/src/Monolog/Handler/ElasticsearchHandler.php
@@ -89,6 +89,7 @@ class ElasticsearchHandler extends AbstractProcessingHandler
         if ($formatter instanceof ElasticsearchFormatter) {
             return parent::setFormatter($formatter);
         }
+
         throw new InvalidArgumentException('ElasticsearchHandler is only compatible with ElasticsearchFormatter');
     }
 
@@ -122,7 +123,7 @@ class ElasticsearchHandler extends AbstractProcessingHandler
     /**
      * Use Elasticsearch bulk API to send list of documents
      *
-     * @param  array $records
+     * @param  array             $records
      * @throws \RuntimeException
      */
     protected function bulkSend(array $records): void
diff --git a/src/Monolog/Handler/ZendMonitorHandler.php b/src/Monolog/Handler/ZendMonitorHandler.php
index 0ced7079..236472ee 100644
--- a/src/Monolog/Handler/ZendMonitorHandler.php
+++ b/src/Monolog/Handler/ZendMonitorHandler.php
@@ -39,8 +39,8 @@ class ZendMonitorHandler extends AbstractProcessingHandler
     ];
 
     /**
-     * @param  string|int                $level   The minimum logging level at which this handler will be triggered.
-     * @param  bool                      $bubble  Whether the messages that are handled can bubble up the stack or not.
+     * @param  string|int                $level  The minimum logging level at which this handler will be triggered.
+     * @param  bool                      $bubble Whether the messages that are handled can bubble up the stack or not.
      * @throws MissingExtensionException
      */
     public function __construct($level = Logger::DEBUG, bool $bubble = true)
diff --git a/src/Monolog/Processor/ProcessorInterface.php b/src/Monolog/Processor/ProcessorInterface.php
index 7e64d4df..c58639b8 100644
--- a/src/Monolog/Processor/ProcessorInterface.php
+++ b/src/Monolog/Processor/ProcessorInterface.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.
diff --git a/src/Monolog/ResettableInterface.php b/src/Monolog/ResettableInterface.php
index 635bc77d..081081f7 100644
--- a/src/Monolog/ResettableInterface.php
+++ b/src/Monolog/ResettableInterface.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.
diff --git a/src/Monolog/SignalHandler.php b/src/Monolog/SignalHandler.php
index 28288c10..918dc97d 100644
--- a/src/Monolog/SignalHandler.php
+++ b/src/Monolog/SignalHandler.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.
diff --git a/src/Monolog/Utils.php b/src/Monolog/Utils.php
index 769cdc00..ed2d45bb 100644
--- a/src/Monolog/Utils.php
+++ b/src/Monolog/Utils.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.
diff --git a/tests/Monolog/Formatter/JsonFormatterTest.php b/tests/Monolog/Formatter/JsonFormatterTest.php
index 2208393c..d7672453 100644
--- a/tests/Monolog/Formatter/JsonFormatterTest.php
+++ b/tests/Monolog/Formatter/JsonFormatterTest.php
@@ -69,7 +69,9 @@ class JsonFormatterTest extends TestCase
     "channel": "test",
     "datetime": "'.$record['datetime']->format('Y-m-d\TH:i:s.uP').'",
     "extra": {}
-}', $formatter->format($record));
+}',
+            $formatter->format($record)
+        );
 
         $formatter->setJsonPrettyPrint(false);
         $record = $this->getRecord();
diff --git a/tests/Monolog/Handler/ElasticaHandlerTest.php b/tests/Monolog/Handler/ElasticaHandlerTest.php
index fb64e657..423adbe6 100644
--- a/tests/Monolog/Handler/ElasticaHandlerTest.php
+++ b/tests/Monolog/Handler/ElasticaHandlerTest.php
@@ -183,6 +183,7 @@ class ElasticaHandlerTest extends TestCase
 
         $client = new Client();
         $handler = new ElasticaHandler($client, $this->options);
+
         try {
             $handler->handleBatch([$msg]);
         } catch (\RuntimeException $e) {
diff --git a/tests/Monolog/Handler/ElasticsearchHandlerTest.php b/tests/Monolog/Handler/ElasticsearchHandlerTest.php
index 943a67ee..7895332b 100644
--- a/tests/Monolog/Handler/ElasticsearchHandlerTest.php
+++ b/tests/Monolog/Handler/ElasticsearchHandlerTest.php
@@ -80,7 +80,7 @@ class ElasticsearchHandlerTest extends TestCase
                     ],
                 ],
                 $data,
-            ]
+            ],
         ];
 
         // setup ES client mock
@@ -229,7 +229,7 @@ class ElasticsearchHandlerTest extends TestCase
     /**
      * Return last created document id from ES response
      *
-     * @param  array $info Elasticsearch last request info
+     * @param  array       $info Elasticsearch last request info
      * @return string|null
      */
     protected function getCreatedDocId(array $info)
@@ -255,7 +255,7 @@ class ElasticsearchHandlerTest extends TestCase
         $params = [
             'index' => $index,
             'type' => $type,
-            'id' => $documentId
+            'id' => $documentId,
         ];
 
         $data = $client->get($params);
diff --git a/tests/Monolog/Handler/InsightOpsHandlerTest.php b/tests/Monolog/Handler/InsightOpsHandlerTest.php
index 209858ae..db6b1e05 100644
--- a/tests/Monolog/Handler/InsightOpsHandlerTest.php
+++ b/tests/Monolog/Handler/InsightOpsHandlerTest.php
@@ -12,9 +12,9 @@
 namespace Monolog\Handler;
 
 use Monolog\Test\TestCase;
- use Monolog\Logger;
+use Monolog\Logger;
 
- /**
+/**
  * @author Robert Kaufmann III <rok3@rok3.me>
  * @author Gabriel Machado <gabriel.ms1@hotmail.com>
  */
diff --git a/tests/Monolog/Handler/RavenHandlerTest.php b/tests/Monolog/Handler/RavenHandlerTest.php
index 5ebfbcff..cff5f543 100644
--- a/tests/Monolog/Handler/RavenHandlerTest.php
+++ b/tests/Monolog/Handler/RavenHandlerTest.php
@@ -294,7 +294,7 @@ class RavenHandlerTest extends TestCase
         $this->assertSame('test', $breadcrumbs[1]['category']);
         $this->assertSame('info', $breadcrumbs[1]['level']);
         $this->assertSame('Step 2: prepare user redirect', $breadcrumbs[1]['message']);
-        
+
         $handler->resetBreadcrumbs();
         $handler->handle($this->getRecord(Logger::INFO, 'Hello!'));
         $this->assertEmpty($ravenClient->breadcrumbs->fetch());
diff --git a/tests/Monolog/LoggerTest.php b/tests/Monolog/LoggerTest.php
index 7dce79ba..f94882db 100644
--- a/tests/Monolog/LoggerTest.php
+++ b/tests/Monolog/LoggerTest.php
@@ -666,7 +666,7 @@ class LoggerTest extends \PHPUnit\Framework\TestCase
         $assertBufferOfBufferHandlerEmpty = function () use ($getProperty, $bufferHandler, $that) {
             $that->assertEmpty($getProperty($bufferHandler, 'buffer'));
         };
-        $assertBuffersEmpty = function() use ($assertBufferOfBufferHandlerEmpty, $getProperty, $fingersCrossedHandler, $that) {
+        $assertBuffersEmpty = function () use ($assertBufferOfBufferHandlerEmpty, $getProperty, $fingersCrossedHandler, $that) {
             $assertBufferOfBufferHandlerEmpty();
             $that->assertEmpty($getProperty($fingersCrossedHandler, 'buffer'));
         };
diff --git a/tests/Monolog/SignalHandlerTest.php b/tests/Monolog/SignalHandlerTest.php
index c2c145bb..5169705a 100644
--- a/tests/Monolog/SignalHandlerTest.php
+++ b/tests/Monolog/SignalHandlerTest.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.
@@ -22,7 +22,6 @@ use Monolog\Test\TestCase;
  */
 class SignalHandlerTest extends TestCase
 {
-
     private $asyncSignalHandling;
     private $blockedSignals;
     private $signalHandlers;
@@ -56,7 +55,8 @@ class SignalHandlerTest extends TestCase
         }
     }
 
-    private function setSignalHandler($signo, $handler = SIG_DFL) {
+    private function setSignalHandler($signo, $handler = SIG_DFL)
+    {
         if (function_exists('pcntl_signal_get_handler')) {
             $this->signalHandlers[$signo] = pcntl_signal_get_handler($signo);
         } else {
@@ -284,5 +284,4 @@ class SignalHandlerTest extends TestCase
             array(true, true, 1, 1),
         );
     }
-
 }