diff --git a/src/Faker/Generator.php b/src/Faker/Generator.php
index 3ae32cb6b8..ec77c08749 100644
--- a/src/Faker/Generator.php
+++ b/src/Faker/Generator.php
@@ -597,7 +597,7 @@ public function ext(string $id): Extension\Extension
         return $extension;
     }
 
-    public function addProvider($provider): void
+    public function addProvider($provider)
     {
         array_unshift($this->providers, $provider);
 
@@ -682,7 +682,7 @@ public function valid(?\Closure $validator = null, int $maxRetries = 10000)
         return new ValidGenerator($this, $validator, $maxRetries);
     }
 
-    public function seed($seed = null): void
+    public function seed($seed = null)
     {
         if ($seed === null) {
             mt_srand();
@@ -966,7 +966,7 @@ public function __destruct()
         $this->seed();
     }
 
-    public function __wakeup(): void
+    public function __wakeup()
     {
         $this->formatters = [];
     }
diff --git a/src/Faker/ORM/CakePHP/EntityPopulator.php b/src/Faker/ORM/CakePHP/EntityPopulator.php
index 370fbd5acb..cd9890bd4d 100644
--- a/src/Faker/ORM/CakePHP/EntityPopulator.php
+++ b/src/Faker/ORM/CakePHP/EntityPopulator.php
@@ -27,17 +27,17 @@ public function __get($name)
     /**
      * @param string $name
      */
-    public function __set($name, $value): void
+    public function __set($name, $value)
     {
         $this->{$name} = $value;
     }
 
-    public function mergeColumnFormattersWith($columnFormatters): void
+    public function mergeColumnFormattersWith($columnFormatters)
     {
         $this->columnFormatters = array_merge($this->columnFormatters, $columnFormatters);
     }
 
-    public function mergeModifiersWith($modifiers): void
+    public function mergeModifiersWith($modifiers)
     {
         $this->modifiers = array_merge($this->modifiers, $modifiers);
     }
@@ -155,7 +155,7 @@ public function execute($class, $insertedEntities, $options = [])
         return $entity->{$pk[0]};
     }
 
-    public function setConnection($name): void
+    public function setConnection($name)
     {
         $this->connectionName = $name;
     }
diff --git a/src/Faker/ORM/Doctrine/EntityPopulator.php b/src/Faker/ORM/Doctrine/EntityPopulator.php
index 7364c7229e..4792399959 100644
--- a/src/Faker/ORM/Doctrine/EntityPopulator.php
+++ b/src/Faker/ORM/Doctrine/EntityPopulator.php
@@ -38,7 +38,7 @@ public function getClass()
         return $this->class->getName();
     }
 
-    public function setColumnFormatters($columnFormatters): void
+    public function setColumnFormatters($columnFormatters)
     {
         $this->columnFormatters = $columnFormatters;
     }
@@ -51,12 +51,12 @@ public function getColumnFormatters()
         return $this->columnFormatters;
     }
 
-    public function mergeColumnFormattersWith($columnFormatters): void
+    public function mergeColumnFormattersWith($columnFormatters)
     {
         $this->columnFormatters = array_merge($this->columnFormatters, $columnFormatters);
     }
 
-    public function setModifiers(array $modifiers): void
+    public function setModifiers(array $modifiers)
     {
         $this->modifiers = $modifiers;
     }
@@ -69,7 +69,7 @@ public function getModifiers()
         return $this->modifiers;
     }
 
-    public function mergeModifiersWith(array $modifiers): void
+    public function mergeModifiersWith(array $modifiers)
     {
         $this->modifiers = array_merge($this->modifiers, $modifiers);
     }
diff --git a/src/Faker/ORM/Doctrine/Populator.php b/src/Faker/ORM/Doctrine/Populator.php
index bf946f7023..1bce6ab47c 100644
--- a/src/Faker/ORM/Doctrine/Populator.php
+++ b/src/Faker/ORM/Doctrine/Populator.php
@@ -61,7 +61,7 @@ public function __construct(Generator $generator, ObjectManager $manager = null,
      * @param mixed $entity A Doctrine classname, or a \Faker\ORM\Doctrine\EntityPopulator instance
      * @param int   $number The number of entities to populate
      */
-    public function addEntity($entity, $number, $customColumnFormatters = [], $customModifiers = [], $generateId = false): void
+    public function addEntity($entity, $number, $customColumnFormatters = [], $customModifiers = [], $generateId = false)
     {
         if (!$entity instanceof \Faker\ORM\Doctrine\EntityPopulator) {
             if (null === $this->manager) {
diff --git a/src/Faker/ORM/Mandango/EntityPopulator.php b/src/Faker/ORM/Mandango/EntityPopulator.php
index e89f947fe0..515ab7b659 100644
--- a/src/Faker/ORM/Mandango/EntityPopulator.php
+++ b/src/Faker/ORM/Mandango/EntityPopulator.php
@@ -29,7 +29,7 @@ public function getClass()
         return $this->class;
     }
 
-    public function setColumnFormatters($columnFormatters): void
+    public function setColumnFormatters($columnFormatters)
     {
         $this->columnFormatters = $columnFormatters;
     }
@@ -42,7 +42,7 @@ public function getColumnFormatters()
         return $this->columnFormatters;
     }
 
-    public function mergeColumnFormattersWith($columnFormatters): void
+    public function mergeColumnFormattersWith($columnFormatters)
     {
         $this->columnFormatters = array_merge($this->columnFormatters, $columnFormatters);
     }
diff --git a/src/Faker/ORM/Mandango/Populator.php b/src/Faker/ORM/Mandango/Populator.php
index 3cee6a4c19..de6c3b81ce 100644
--- a/src/Faker/ORM/Mandango/Populator.php
+++ b/src/Faker/ORM/Mandango/Populator.php
@@ -27,7 +27,7 @@ public function __construct(\Faker\Generator $generator, Mandango $mandango)
      * @param mixed $entity A Propel ActiveRecord classname, or a \Faker\ORM\Propel\EntityPopulator instance
      * @param int   $number The number of entities to populate
      */
-    public function addEntity($entity, $number, $customColumnFormatters = []): void
+    public function addEntity($entity, $number, $customColumnFormatters = [])
     {
         if (!$entity instanceof \Faker\ORM\Mandango\EntityPopulator) {
             $entity = new \Faker\ORM\Mandango\EntityPopulator($entity);
diff --git a/src/Faker/ORM/Propel/EntityPopulator.php b/src/Faker/ORM/Propel/EntityPopulator.php
index 91dd8cb038..f5af75c968 100644
--- a/src/Faker/ORM/Propel/EntityPopulator.php
+++ b/src/Faker/ORM/Propel/EntityPopulator.php
@@ -29,7 +29,7 @@ public function getClass()
         return $this->class;
     }
 
-    public function setColumnFormatters($columnFormatters): void
+    public function setColumnFormatters($columnFormatters)
     {
         $this->columnFormatters = $columnFormatters;
     }
@@ -42,7 +42,7 @@ public function getColumnFormatters()
         return $this->columnFormatters;
     }
 
-    public function mergeColumnFormattersWith($columnFormatters): void
+    public function mergeColumnFormattersWith($columnFormatters)
     {
         $this->columnFormatters = array_merge($this->columnFormatters, $columnFormatters);
     }
@@ -126,7 +126,7 @@ protected function isColumnBehavior(\ColumnMap $columnMap)
         return false;
     }
 
-    public function setModifiers($modifiers): void
+    public function setModifiers($modifiers)
     {
         $this->modifiers = $modifiers;
     }
@@ -139,7 +139,7 @@ public function getModifiers()
         return $this->modifiers;
     }
 
-    public function mergeModifiersWith($modifiers): void
+    public function mergeModifiersWith($modifiers)
     {
         $this->modifiers = array_merge($this->modifiers, $modifiers);
     }
diff --git a/src/Faker/ORM/Propel/Populator.php b/src/Faker/ORM/Propel/Populator.php
index aecb028e64..e3d4298107 100644
--- a/src/Faker/ORM/Propel/Populator.php
+++ b/src/Faker/ORM/Propel/Populator.php
@@ -23,7 +23,7 @@ public function __construct(\Faker\Generator $generator)
      * @param mixed $entity A Propel ActiveRecord classname, or a \Faker\ORM\Propel\EntityPopulator instance
      * @param int   $number The number of entities to populate
      */
-    public function addEntity($entity, $number, $customColumnFormatters = [], $customModifiers = []): void
+    public function addEntity($entity, $number, $customColumnFormatters = [], $customModifiers = [])
     {
         if (!$entity instanceof \Faker\ORM\Propel\EntityPopulator) {
             $entity = new \Faker\ORM\Propel\EntityPopulator($entity);
diff --git a/src/Faker/ORM/Propel2/EntityPopulator.php b/src/Faker/ORM/Propel2/EntityPopulator.php
index 32e027ff24..44804e37cf 100644
--- a/src/Faker/ORM/Propel2/EntityPopulator.php
+++ b/src/Faker/ORM/Propel2/EntityPopulator.php
@@ -30,7 +30,7 @@ public function getClass()
         return $this->class;
     }
 
-    public function setColumnFormatters($columnFormatters): void
+    public function setColumnFormatters($columnFormatters)
     {
         $this->columnFormatters = $columnFormatters;
     }
@@ -43,7 +43,7 @@ public function getColumnFormatters()
         return $this->columnFormatters;
     }
 
-    public function mergeColumnFormattersWith($columnFormatters): void
+    public function mergeColumnFormattersWith($columnFormatters)
     {
         $this->columnFormatters = array_merge($this->columnFormatters, $columnFormatters);
     }
@@ -129,7 +129,7 @@ protected function isColumnBehavior(ColumnMap $columnMap)
         return false;
     }
 
-    public function setModifiers($modifiers): void
+    public function setModifiers($modifiers)
     {
         $this->modifiers = $modifiers;
     }
@@ -142,7 +142,7 @@ public function getModifiers()
         return $this->modifiers;
     }
 
-    public function mergeModifiersWith($modifiers): void
+    public function mergeModifiersWith($modifiers)
     {
         $this->modifiers = array_merge($this->modifiers, $modifiers);
     }
diff --git a/src/Faker/ORM/Propel2/Populator.php b/src/Faker/ORM/Propel2/Populator.php
index a9b3fc6e12..7698f80e9a 100644
--- a/src/Faker/ORM/Propel2/Populator.php
+++ b/src/Faker/ORM/Propel2/Populator.php
@@ -26,7 +26,7 @@ public function __construct(\Faker\Generator $generator)
      * @param mixed $entity A Propel ActiveRecord classname, or a \Faker\ORM\Propel2\EntityPopulator instance
      * @param int   $number The number of entities to populate
      */
-    public function addEntity($entity, $number, $customColumnFormatters = [], $customModifiers = []): void
+    public function addEntity($entity, $number, $customColumnFormatters = [], $customModifiers = [])
     {
         if (!$entity instanceof \Faker\ORM\Propel2\EntityPopulator) {
             $entity = new \Faker\ORM\Propel2\EntityPopulator($entity);
diff --git a/src/Faker/ORM/Spot/EntityPopulator.php b/src/Faker/ORM/Spot/EntityPopulator.php
index 1290e83005..b67ae25307 100644
--- a/src/Faker/ORM/Spot/EntityPopulator.php
+++ b/src/Faker/ORM/Spot/EntityPopulator.php
@@ -60,7 +60,7 @@ public function getMapper()
         return $this->mapper;
     }
 
-    public function setColumnFormatters($columnFormatters): void
+    public function setColumnFormatters($columnFormatters)
     {
         $this->columnFormatters = $columnFormatters;
     }
@@ -73,12 +73,12 @@ public function getColumnFormatters()
         return $this->columnFormatters;
     }
 
-    public function mergeColumnFormattersWith($columnFormatters): void
+    public function mergeColumnFormattersWith($columnFormatters)
     {
         $this->columnFormatters = array_merge($this->columnFormatters, $columnFormatters);
     }
 
-    public function setModifiers(array $modifiers): void
+    public function setModifiers(array $modifiers)
     {
         $this->modifiers = $modifiers;
     }
@@ -91,7 +91,7 @@ public function getModifiers()
         return $this->modifiers;
     }
 
-    public function mergeModifiersWith(array $modifiers): void
+    public function mergeModifiersWith(array $modifiers)
     {
         $this->modifiers = array_merge($this->modifiers, $modifiers);
     }
diff --git a/src/Faker/ORM/Spot/Populator.php b/src/Faker/ORM/Spot/Populator.php
index 8e36607d5b..b321f5c5a4 100644
--- a/src/Faker/ORM/Spot/Populator.php
+++ b/src/Faker/ORM/Spot/Populator.php
@@ -38,7 +38,7 @@ public function addEntity(
         $customColumnFormatters = [],
         $customModifiers = [],
         $useExistingData = false
-    ): void {
+    ) {
         $mapper = $this->locator->mapper($entityName);
 
         if (null === $mapper) {
diff --git a/src/Faker/Provider/DateTime.php b/src/Faker/Provider/DateTime.php
index 1d57ff45bd..46c3c90fec 100644
--- a/src/Faker/Provider/DateTime.php
+++ b/src/Faker/Provider/DateTime.php
@@ -356,7 +356,7 @@ private static function setTimezone(\DateTime $dt, $timezone)
      *
      * @param string $timezone
      */
-    public static function setDefaultTimezone($timezone = null): void
+    public static function setDefaultTimezone($timezone = null)
     {
         static::$defaultTimezone = $timezone;
     }