diff --git a/flextype/cache/AcpuAdapter.php b/flextype/cache/AcpuAdapter.php
index a7a325e3..14c6e4fa 100644
--- a/flextype/cache/AcpuAdapter.php
+++ b/flextype/cache/AcpuAdapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Psr\Container\ContainerInterface;
@@ -9,7 +11,7 @@ class AcpuAdapter implements CacheAdapterInterface
 {
     function __construct(ContainerInterface $flextype)
     {
-        $this->flextype = $flextype;   
+        $this->flextype = $flextype;
     }
 
     public function getDriver() : object
diff --git a/flextype/cache/ArrayAdapter.php b/flextype/cache/ArrayAdapter.php
index 4df068c8..2ea2284f 100644
--- a/flextype/cache/ArrayAdapter.php
+++ b/flextype/cache/ArrayAdapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Doctrine\Common\Cache\ArrayCache;
diff --git a/flextype/cache/CacheAdapterInterface.php b/flextype/cache/CacheAdapterInterface.php
index c27e3b8b..588d38e6 100644
--- a/flextype/cache/CacheAdapterInterface.php
+++ b/flextype/cache/CacheAdapterInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Psr\Container\ContainerInterface;
@@ -8,7 +10,7 @@ interface CacheAdapterInterface
 {
     /**
      * Injects the dependency container
-     * 
+     *
      * @param \Psr\Container\ContainerInterface $container
      * @return void
      */
@@ -16,7 +18,7 @@ interface CacheAdapterInterface
 
     /**
      * Returns the cache driver object
-     * 
+     *
      * @return object
      */
     public function getDriver() : object;
diff --git a/flextype/cache/FilesystemAdapter.php b/flextype/cache/FilesystemAdapter.php
index e56ac958..16de8996 100644
--- a/flextype/cache/FilesystemAdapter.php
+++ b/flextype/cache/FilesystemAdapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Doctrine\Common\Cache\FilesystemCache;
diff --git a/flextype/cache/MemcachedAdapter.php b/flextype/cache/MemcachedAdapter.php
index 149999d1..b9fb6d02 100644
--- a/flextype/cache/MemcachedAdapter.php
+++ b/flextype/cache/MemcachedAdapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Doctrine\Common\Cache\MemcachedCache;
@@ -20,7 +22,7 @@ class MemcachedAdapter implements CacheAdapterInterface
             $this->flextype['registry']->get('settings.cache.memcached.server', 'localhost'),
             $this->flextype['registry']->get('settings.cache.memcache.port', 11211)
         );
-        
+
         $driver = new MemcachedCache();
         $driver->setMemcached($memcached);
 
diff --git a/flextype/cache/RedisAdapter.php b/flextype/cache/RedisAdapter.php
index a8b7ba21..cfd6df43 100644
--- a/flextype/cache/RedisAdapter.php
+++ b/flextype/cache/RedisAdapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Psr\Container\ContainerInterface;
diff --git a/flextype/cache/SQLite3Adapter.php b/flextype/cache/SQLite3Adapter.php
index ff225a15..032a9135 100644
--- a/flextype/cache/SQLite3Adapter.php
+++ b/flextype/cache/SQLite3Adapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Flextype\Component\Filesystem\Filesystem;
diff --git a/flextype/cache/WinCacheAdapter.php b/flextype/cache/WinCacheAdapter.php
index 0fb7cf89..32cf7139 100644
--- a/flextype/cache/WinCacheAdapter.php
+++ b/flextype/cache/WinCacheAdapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Doctrine\Common\Cache\WinCacheCache;
diff --git a/flextype/cache/ZendDataCacheAdapter.php b/flextype/cache/ZendDataCacheAdapter.php
index 9661b026..97a23252 100644
--- a/flextype/cache/ZendDataCacheAdapter.php
+++ b/flextype/cache/ZendDataCacheAdapter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Flextype\Cache;
 
 use Doctrine\Common\Cache\ZendDataCache;
diff --git a/flextype/dependencies.php b/flextype/dependencies.php
index 2fdf5d4f..9cec775b 100644
--- a/flextype/dependencies.php
+++ b/flextype/dependencies.php
@@ -121,7 +121,7 @@ $flextype['cache_adapter'] = static function ($container) use ($flextype) {
             $driver_name = 'filesystem';
         }
     }
-    
+
     $class = ucfirst($driver_name);
     $adapter = "Flextype\\Cache\\{$class}Adapter";