diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index b442d97..e39b20f 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -70,7 +70,6 @@ public function getConfigTreeBuilder()
                                 ->end()
                             ->end()
                         ->end()
-                        ->append($this->createSimpleProviderNode('google'))
                         ->append($this->createSimpleProviderNode('cryptonator'))
                         ->append($this->createSimpleProviderNode('webservicex'))
                         ->append($this->createSimpleProviderNode('central_bank_of_czech_republic'))
diff --git a/DependencyInjection/FlorianvSwapExtension.php b/DependencyInjection/FlorianvSwapExtension.php
index c48546e..348d9ef 100644
--- a/DependencyInjection/FlorianvSwapExtension.php
+++ b/DependencyInjection/FlorianvSwapExtension.php
@@ -11,7 +11,7 @@
 
 namespace Florianv\SwapBundle\DependencyInjection;
 
-use Psr\Cache\CacheItemPoolInterface;
+use Psr\SimpleCache\CacheInterface;
 use Swap;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
@@ -107,8 +107,8 @@ public function configureCacheService(ContainerBuilder $container, array $config
             $container->setDefinition($id, $definition);
         } elseif ($container->hasDefinition($type)) {
             $definition = $container->getDefinition($type);
-            if (!is_subclass_of($definition->getClass(), CacheItemPoolInterface::class)) {
-                throw new InvalidArgumentException("Service '$type' does not implements " . CacheItemPoolInterface::class);
+            if (!is_subclass_of($definition->getClass(), CacheInterface::class)) {
+                throw new InvalidArgumentException("Service '$type' does not implements " . CacheInterface::class);
             }
 
             $id = $type;
@@ -119,7 +119,7 @@ public function configureCacheService(ContainerBuilder $container, array $config
         $definition = $container->getDefinition('florianv_swap.builder');
         $definition
             ->replaceArgument(0, ['cache_ttl' => $ttl])
-            ->addMethodCall('useCacheItemPool', [new Reference($id)]);
+            ->addMethodCall('useSimpleCache', [new Reference($id)]);
     }
 
     /**
diff --git a/README.md b/README.md
index d475b06..334c5e7 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,6 @@ Here is the list of the currently implemented services:
 | [Central Bank of Russia](https://cbr.ru) | * | RUB | Yes |
 | [WebserviceX](http://www.webservicex.net) | * | * | No |
 | [1Forge](https://1forge.com) | * (free but limited or paid) | * (free but limited or paid) | No |
-| [Google](https://www.google.com/finance) | * | * | No |
 | [Cryptonator](https://www.cryptonator.com) | * Crypto (Limited standard currencies) | * Crypto (Limited standard currencies)  | No |
 | [CurrencyDataFeed](https://currencydatafeed.com) | * (free but limited or paid) | * (free but limited or paid) | No |
 | [Open Exchange Rates](https://openexchangerates.org) | USD (free), * (paid) | * | Yes |
diff --git a/Resources/doc/index.md b/Resources/doc/index.md
index 0adc0ed..b4c301a 100644
--- a/Resources/doc/index.md
+++ b/Resources/doc/index.md
@@ -49,7 +49,6 @@ florianv_swap:
         currency_layer:                    # currencylayer
             access_key: secret
             enterprise: true
-        google: ~                          # Google Finance
         webservicex: ~                     # WebserviceX
         cryptonator: ~                     # Cryptonator
         forge:                             # Forge
diff --git a/Tests/DependencyInjection/ConfigurationTest.php b/Tests/DependencyInjection/ConfigurationTest.php
index 26eab53..9490428 100644
--- a/Tests/DependencyInjection/ConfigurationTest.php
+++ b/Tests/DependencyInjection/ConfigurationTest.php
@@ -113,7 +113,6 @@ public function provideValidProvidersConfigs()
             [['central_bank_of_republic_turkey' => []]],
             [['european_central_bank' => null]],
             [['fixer' => ['access_key' => 'YOUR_KEY']]],
-            [['google' => null]],
             [['national_bank_of_romania' => null]],
             [['webservicex' => null]],
             [['russian_central_bank' => null]],
@@ -161,7 +160,6 @@ public function provideInvalidProvidersConfigs()
             [['central_bank_of_republic_turkey' => ['any' => 'any']]],
             [['european_central_bank' => ['any' => 'any']]],
             [['fixer' => ['any' => 'any']]],
-            [['google' => ['any']]],
             [['national_bank_of_romania' => ['any' => 'any']]],
             [['webservicex' => ['any' => 'any']]],
             [['russian_central_bank' => ['any' => 'any']]],
diff --git a/Tests/DependencyInjection/FlorianvSwapExtensionTest.php b/Tests/DependencyInjection/FlorianvSwapExtensionTest.php
index e1ad8b7..9ddbfcb 100644
--- a/Tests/DependencyInjection/FlorianvSwapExtensionTest.php
+++ b/Tests/DependencyInjection/FlorianvSwapExtensionTest.php
@@ -79,7 +79,7 @@ public function testProviderPriorities()
     {
         $this->buildContainer([
             'fixer' => ['access_key' => 'YOUR_KEY'],
-            'google' => [
+            'european_central_bank' => [
                 'priority' => 3,
             ],
             'forge' => [
@@ -91,9 +91,9 @@ public function testProviderPriorities()
         $swap = $this->container->getDefinition('florianv_swap.builder');
         $calls = $swap->getMethodCalls();
 
-        // Google first
+        // European Central Bank first
         $this->assertEquals($calls[0][0], 'add');
-        $this->assertEquals($calls[0][1][0], 'google');
+        $this->assertEquals($calls[0][1][0], 'european_central_bank');
         $this->assertEquals($calls[0][1][1], []);
 
         // Forge second
@@ -165,7 +165,7 @@ private function assertCache($class, $config)
     {
         $swap = $this->container->getDefinition('florianv_swap.builder');
         $calls = $swap->getMethodCalls();
-        $this->assertEquals($calls[0][0], 'useCacheItemPool');
+        $this->assertEquals($calls[0][0], 'useSimpleCache');
         /** @var Reference $cacheReference */
         $cacheReference = $calls[0][1][0];
         $this->assertEquals('florianv_swap.cache', (string)$cacheReference);
diff --git a/composer.json b/composer.json
index d1807f6..f145515 100644
--- a/composer.json
+++ b/composer.json
@@ -18,13 +18,14 @@
     "require": {
         "php": "^5.6|^7.0",
         "symfony/framework-bundle": "~3.0 || ~4.0",
-        "florianv/swap": "^3.4"
+        "florianv/swap": "^4.0"
     },
     "require-dev": {
         "php-http/guzzle6-adapter": "^1.0",
-        "php-http/message": "^1.0",
+        "php-http/message": "^1.7",
         "symfony/cache": "~3.0|~4.0",
-        "phpunit/phpunit": "~5.0"
+        "phpunit/phpunit": "~5.0",
+        "nyholm/psr7": "^1.1"
     },
     "suggest": {
         "symfony/cache": "For caching"