diff --git a/src/league/oauth2-client/README.md b/src/league/oauth2-client/README.md
index 50155e3..0610ddc 100644
--- a/src/league/oauth2-client/README.md
+++ b/src/league/oauth2-client/README.md
@@ -114,7 +114,7 @@ if (!isset($_GET['code'])) {
 
         // The provider provides a way to get an authenticated API request for
         // the service, using the access token; it returns an object conforming
-        // to Psr\Http\Message\RequestInterface.
+        // to MichaelKaefer\GuzzleHttp6ForPrestashop17\Psr\Http\Message\RequestInterface.
         $request = $provider->getAuthenticatedRequest(
             'GET',
             'http://brentertainment.com/oauth2/lockdin/resource',
diff --git a/src/league/oauth2-client/src/Provider/AbstractProvider.php b/src/league/oauth2-client/src/Provider/AbstractProvider.php
index 50d726b..4e1b232 100644
--- a/src/league/oauth2-client/src/Provider/AbstractProvider.php
+++ b/src/league/oauth2-client/src/Provider/AbstractProvider.php
@@ -14,9 +14,9 @@
 
 namespace MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Provider;
 
-use GuzzleHttp\Client as HttpClient;
-use GuzzleHttp\ClientInterface as HttpClientInterface;
-use GuzzleHttp\Exception\BadResponseException;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\GuzzleHttp\Client as HttpClient;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\GuzzleHttp\ClientInterface as HttpClientInterface;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\GuzzleHttp\Exception\BadResponseException;
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Grant\AbstractGrant;
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Grant\GrantFactory;
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Provider\Exception\IdentityProviderException;
@@ -24,8 +24,8 @@
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Tool\ArrayAccessorTrait;
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Tool\QueryBuilderTrait;
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Tool\RequestFactory;
-use Psr\Http\Message\RequestInterface;
-use Psr\Http\Message\ResponseInterface;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\Psr\Http\Message\RequestInterface;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\Psr\Http\Message\ResponseInterface;
 use UnexpectedValueException;
 
 /**
diff --git a/src/league/oauth2-client/src/Provider/GenericProvider.php b/src/league/oauth2-client/src/Provider/GenericProvider.php
index dd7efc9..03f7b84 100644
--- a/src/league/oauth2-client/src/Provider/GenericProvider.php
+++ b/src/league/oauth2-client/src/Provider/GenericProvider.php
@@ -18,7 +18,7 @@
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Provider\Exception\IdentityProviderException;
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Token\AccessToken;
 use MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Tool\BearerAuthorizationTrait;
-use Psr\Http\Message\ResponseInterface;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\Psr\Http\Message\ResponseInterface;
 
 /**
  * Represents a generic service provider that may be used to interact with any
diff --git a/src/league/oauth2-client/src/Tool/ProviderRedirectTrait.php b/src/league/oauth2-client/src/Tool/ProviderRedirectTrait.php
index c3a5dc2..bcda845 100644
--- a/src/league/oauth2-client/src/Tool/ProviderRedirectTrait.php
+++ b/src/league/oauth2-client/src/Tool/ProviderRedirectTrait.php
@@ -2,11 +2,11 @@
 
 namespace MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Tool;
 
-use GuzzleHttp\Exception\BadResponseException;
-use GuzzleHttp\Psr7\Uri;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\GuzzleHttp\Exception\BadResponseException;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\GuzzleHttp\Psr7\Uri;
 use InvalidArgumentException;
-use Psr\Http\Message\RequestInterface;
-use Psr\Http\Message\ResponseInterface;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\Psr\Http\Message\RequestInterface;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\Psr\Http\Message\ResponseInterface;
 
 trait ProviderRedirectTrait
 {
@@ -50,7 +50,7 @@ protected function followRequestRedirects(RequestInterface $request)
     /**
      * Returns the HTTP client instance.
      *
-     * @return GuzzleHttp\ClientInterface
+     * @return MichaelKaefer\GuzzleHttp6ForPrestashop17\GuzzleHttp\ClientInterface
      */
     abstract public function getHttpClient();
 
diff --git a/src/league/oauth2-client/src/Tool/RequestFactory.php b/src/league/oauth2-client/src/Tool/RequestFactory.php
index a54d248..5c5840c 100644
--- a/src/league/oauth2-client/src/Tool/RequestFactory.php
+++ b/src/league/oauth2-client/src/Tool/RequestFactory.php
@@ -14,7 +14,7 @@
 
 namespace MichaelKaefer\OAuth2ClientForPrestashop17\League\OAuth2\Client\Tool;
 
-use GuzzleHttp\Psr7\Request;
+use MichaelKaefer\GuzzleHttp6ForPrestashop17\GuzzleHttp\Psr7\Request;
 
 /**
  * Used to produce PSR-7 Request instances.