diff --git a/composer.json b/composer.json
index 729f06d..36653a3 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     },
     "minimum-stability" : "dev",
     "require": {
-        "php": ">=5.4.0"
+        "php": ">=7.1"
     },
     "require-dev": {
         "atoum/atoum": "^2.8|^3.0",
diff --git a/src/M6Web/Component/Statsd/Client.php b/src/M6Web/Component/Statsd/Client.php
index e8bbe3d..e3b8d4f 100644
--- a/src/M6Web/Component/Statsd/Client.php
+++ b/src/M6Web/Component/Statsd/Client.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * class sending udp packets to statsd
  */
diff --git a/src/M6Web/Component/Statsd/Exception.php b/src/M6Web/Component/Statsd/Exception.php
index d8bf984..fcd6627 100644
--- a/src/M6Web/Component/Statsd/Exception.php
+++ b/src/M6Web/Component/Statsd/Exception.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * Statsd exception
  */
diff --git a/src/M6Web/Component/Statsd/MessageEntity.php b/src/M6Web/Component/Statsd/MessageEntity.php
index 2418c11..bc0359d 100644
--- a/src/M6Web/Component/Statsd/MessageEntity.php
+++ b/src/M6Web/Component/Statsd/MessageEntity.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd;
 
 /**
diff --git a/src/M6Web/Component/Statsd/MessageFormatter/DogStatsDMessageFormatter.php b/src/M6Web/Component/Statsd/MessageFormatter/DogStatsDMessageFormatter.php
index efa344d..67231aa 100644
--- a/src/M6Web/Component/Statsd/MessageFormatter/DogStatsDMessageFormatter.php
+++ b/src/M6Web/Component/Statsd/MessageFormatter/DogStatsDMessageFormatter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd\MessageFormatter;
 
 use M6Web\Component\Statsd\MessageEntity;
diff --git a/src/M6Web/Component/Statsd/MessageFormatter/InfluxDBStatsDMessageFormatter.php b/src/M6Web/Component/Statsd/MessageFormatter/InfluxDBStatsDMessageFormatter.php
index 107da8a..181058e 100644
--- a/src/M6Web/Component/Statsd/MessageFormatter/InfluxDBStatsDMessageFormatter.php
+++ b/src/M6Web/Component/Statsd/MessageFormatter/InfluxDBStatsDMessageFormatter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd\MessageFormatter;
 
 use M6Web\Component\Statsd\MessageEntity;
diff --git a/src/M6Web/Component/Statsd/MessageFormatter/MessageFormatterInterface.php b/src/M6Web/Component/Statsd/MessageFormatter/MessageFormatterInterface.php
index 96f3b5b..bf4e55b 100644
--- a/src/M6Web/Component/Statsd/MessageFormatter/MessageFormatterInterface.php
+++ b/src/M6Web/Component/Statsd/MessageFormatter/MessageFormatterInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd\MessageFormatter;
 
 use M6Web\Component\Statsd\MessageEntity;
diff --git a/src/M6Web/Component/Tests/Units/Client.php b/src/M6Web/Component/Tests/Units/Client.php
index 7b75439..f675668 100644
--- a/src/M6Web/Component/Tests/Units/Client.php
+++ b/src/M6Web/Component/Tests/Units/Client.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd\Tests\Units;
 
 use M6Web\Component\Statsd;
diff --git a/src/M6Web/Component/Tests/Units/MessageEntity.php b/src/M6Web/Component/Tests/Units/MessageEntity.php
index 3262a33..cafb2e6 100644
--- a/src/M6Web/Component/Tests/Units/MessageEntity.php
+++ b/src/M6Web/Component/Tests/Units/MessageEntity.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd\Tests\Units;
 
 use M6Web\Component\Statsd;
diff --git a/src/M6Web/Component/Tests/Units/MessageFormatter/DogStatsDMessageFormatter.php b/src/M6Web/Component/Tests/Units/MessageFormatter/DogStatsDMessageFormatter.php
index 4fbe237..df94caf 100644
--- a/src/M6Web/Component/Tests/Units/MessageFormatter/DogStatsDMessageFormatter.php
+++ b/src/M6Web/Component/Tests/Units/MessageFormatter/DogStatsDMessageFormatter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd\Tests\Units\MessageFormatter;
 
 use M6Web\Component\Statsd;
diff --git a/src/M6Web/Component/Tests/Units/MessageFormatter/InfluxDBStatsDMessageFormatter.php b/src/M6Web/Component/Tests/Units/MessageFormatter/InfluxDBStatsDMessageFormatter.php
index fd83ed4..f7ce8cc 100644
--- a/src/M6Web/Component/Tests/Units/MessageFormatter/InfluxDBStatsDMessageFormatter.php
+++ b/src/M6Web/Component/Tests/Units/MessageFormatter/InfluxDBStatsDMessageFormatter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace M6Web\Component\Statsd\Tests\Units\MessageFormatter;
 
 use M6Web\Component\Statsd;