diff --git a/src/Liip/RMT/Action/CommandAction.php b/src/Liip/RMT/Action/CommandAction.php
index b2ea5b0e..536c04fd 100644
--- a/src/Liip/RMT/Action/CommandAction.php
+++ b/src/Liip/RMT/Action/CommandAction.php
@@ -40,7 +40,7 @@ public function execute()
 
         // Prepare a callback for live output
         $callback = null;
-        if ($this->options['live_output'] == true) {
+        if ($this->options['live_output']) {
             $callback = function ($type, $buffer) {
                 $decorator = array('','');
                 if ($type == Process::ERR) {
diff --git a/src/Liip/RMT/Action/FilesUpdateAction.php b/src/Liip/RMT/Action/FilesUpdateAction.php
index 4e6367c2..aad199ea 100644
--- a/src/Liip/RMT/Action/FilesUpdateAction.php
+++ b/src/Liip/RMT/Action/FilesUpdateAction.php
@@ -29,7 +29,7 @@ public function execute()
 
         foreach ($this->options as $option) {
             $file = $option[0];
-            $pattern = isset($option[1]) ? $option[1] : null;
+            $pattern = $option[1] ?? null;
 
             if (! file_exists($file)) {
                 $versionClass = new ReflectionClass($file);
diff --git a/src/Liip/RMT/Action/VcsPublishAction.php b/src/Liip/RMT/Action/VcsPublishAction.php
index 2eded84f..56c44699 100644
--- a/src/Liip/RMT/Action/VcsPublishAction.php
+++ b/src/Liip/RMT/Action/VcsPublishAction.php
@@ -86,7 +86,7 @@ public function getInformationRequests()
      *
      * @return string|null
      */
-    protected function getRemote()
+    protected function getRemote(): ?string
     {
         if ($this->options['ask-remote-name']) {
             return Context::get('information-collector')->getValueFor('remote');
@@ -95,6 +95,6 @@ protected function getRemote()
             return $this->options['remote-name'];
         }
 
-        return;
+        return null;
     }
 }
diff --git a/src/Liip/RMT/Changelog/ChangelogManager.php b/src/Liip/RMT/Changelog/ChangelogManager.php
index 28453619..487486fe 100644
--- a/src/Liip/RMT/Changelog/ChangelogManager.php
+++ b/src/Liip/RMT/Changelog/ChangelogManager.php
@@ -18,6 +18,7 @@ class ChangelogManager
 {
     protected $filePath;
     protected $formatter;
+    protected $format;
 
     public function __construct($filePath, $format)
     {
diff --git a/src/Liip/RMT/Command/CurrentCommand.php b/src/Liip/RMT/Command/CurrentCommand.php
index d3e2f257..81c5c043 100644
--- a/src/Liip/RMT/Command/CurrentCommand.php
+++ b/src/Liip/RMT/Command/CurrentCommand.php
@@ -37,7 +37,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         if ($input->getOption('vcs-tag')) {
             $vcsTag = Context::get('version-persister')->getCurrentVersionTag();
         }
-        if ($input->getOption('raw') == true) {
+        if ($input->getOption('raw')) {
             $output->writeln($input->getOption('vcs-tag') ? $vcsTag : $version);
         } else {
             $msg = "Current release is: <green>$version</green>";
diff --git a/src/Liip/RMT/Config/Handler.php b/src/Liip/RMT/Config/Handler.php
index 5b08b0e5..4eb3f49f 100644
--- a/src/Liip/RMT/Config/Handler.php
+++ b/src/Liip/RMT/Config/Handler.php
@@ -200,27 +200,26 @@ protected function findInternalClass($name, $sectionName)
         }
 
         // Guess the namespace
-        $namespacesByType = array(
+        $namespacesByType = [
             'vcs' => 'Liip\RMT\VCS',
             'prerequisites' => 'Liip\RMT\Prerequisite',
             'pre-release-actions' => 'Liip\RMT\Action',
             'post-release-actions' => 'Liip\RMT\Action',
             'version-generator' => 'Liip\RMT\Version\Generator',
             'version-persister' => 'Liip\RMT\Version\Persister',
-        );
+        ];
         $nameSpace = $namespacesByType[$classType];
 
         // Guess the class name
         // Convert from xxx-yyy-zzz to XxxYyyZzz and append suffix
-        $suffixByType = array(
+        $suffixByType = [
             'vcs' => '',
             'prerequisites' => '',
             'pre-release-actions' => 'Action',
             'post-release-actions' => 'Action',
             'version-generator' => 'Generator',
             'version-persister' => 'Persister',
-        );
-        $nameSpace = $namespacesByType[$classType];
+        ];
         $className = str_replace(' ', '', ucwords(str_replace('-', ' ', $name))).$suffixByType[$classType];
 
         return $nameSpace.'\\'.$className;
diff --git a/src/Liip/RMT/Prerequisite/TestsCheck.php b/src/Liip/RMT/Prerequisite/TestsCheck.php
index 6276b159..25381f96 100644
--- a/src/Liip/RMT/Prerequisite/TestsCheck.php
+++ b/src/Liip/RMT/Prerequisite/TestsCheck.php
@@ -40,7 +40,7 @@ public function execute()
         }
 
         // Run the tests and live output with the standard output class
-        $timeout = isset($this->options['timeout']) ? $this->options['timeout'] : null;
+        $timeout = $this->options['timeout'] ?? null;
         $process = $this->executeCommandInProcess($this->options['command'], $timeout);
 
         // Break up if the result is not good
diff --git a/src/Liip/RMT/Version/Generator/SemanticGenerator.php b/src/Liip/RMT/Version/Generator/SemanticGenerator.php
index 55373e57..f7a22f91 100644
--- a/src/Liip/RMT/Version/Generator/SemanticGenerator.php
+++ b/src/Liip/RMT/Version/Generator/SemanticGenerator.php
@@ -37,17 +37,11 @@ public function __construct($options = array())
      */
     public function generateNextVersion($currentVersion)
     {
-        $type = isset($this->options['type']) ?
-            $this->options['type'] :
-            Context::get('information-collector')->getValueFor('type')
-        ;
+        $type = $this->options['type'] ?? Context::get('information-collector')->getValueFor('type');
 
         $label = 'none';
-        if (isset($this->options['allow-label']) && $this->options['allow-label'] == true) {
-            $label = isset($this->options['label']) ?
-                $this->options['label'] :
-                Context::get('information-collector')->getValueFor('label')
-            ;
+        if (isset($this->options['allow-label']) && $this->options['allow-label']) {
+            $label = $this->options['label'] ?? Context::get('information-collector')->getValueFor('label');
         }
 
         // Type validation
diff --git a/src/Liip/RMT/Version/Persister/TagValidator.php b/src/Liip/RMT/Version/Persister/TagValidator.php
index e11a60c3..2dd44ab1 100644
--- a/src/Liip/RMT/Version/Persister/TagValidator.php
+++ b/src/Liip/RMT/Version/Persister/TagValidator.php
@@ -13,7 +13,10 @@
 
 class TagValidator
 {
-    public function __construct($regex, $tagPrefix = '')
+    protected $regex;
+    protected $tagPrefix;
+
+    public function __construct(string $regex, string $tagPrefix = '')
     {
         $this->regex = $regex;
         $this->tagPrefix = $tagPrefix;