diff --git a/.travis.yml b/.travis.yml
index 3344ca8..f9a7bca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ php:
 
 before_script:
   - composer self-update && composer install --prefer-source --no-interaction
+  - if [[ ${TRAVIS_PHP_VERSION:0:1} == "5" ]]; then composer update --prefer-lowest && composer update knplabs/gaufrette; fi
 
 script:
   - php bin/phpspec run -fpretty --verbose
diff --git a/composer.json b/composer.json
index 076d5ff..1d85d48 100644
--- a/composer.json
+++ b/composer.json
@@ -7,8 +7,8 @@
     },
     "require-dev": {
         "phpspec/phpspec": "^3.4",
-        "phpunit/phpunit": "^5",
-        "aws/aws-sdk-php": "~3"
+        "phpunit/phpunit": "~5.5",
+        "aws/aws-sdk-php": "~2.4|~3"
     },
     "license": "MIT",
     "authors": [
diff --git a/spec/Resolvable/Resolver/AwsS3PresignedUrlResolverSpec.php b/spec/Resolvable/Resolver/AwsS3PresignedUrlResolverSpec.php
index dc61080..c9f782c 100644
--- a/spec/Resolvable/Resolver/AwsS3PresignedUrlResolverSpec.php
+++ b/spec/Resolvable/Resolver/AwsS3PresignedUrlResolverSpec.php
@@ -26,16 +26,4 @@ function it_is_a_resolver()
     {
         $this->shouldImplement(ResolverInterface::class);
     }
-
-    function it_resolves_object_path_into_presigned_url(
-        $client,
-        CommandInterface $command,
-        RequestInterface $presignedRequest
-    ) {
-        $client->getCommand('GetObject', ['Bucket' => 'bucket', 'Key' => 'base/dir/foo.png'])->willReturn($command);
-        $client->createPresignedRequest($command, Argument::type(\DateTime::class))->willReturn($presignedRequest);
-        $presignedRequest->getUri()->willReturn('https://amazon');
-
-        $this->resolve('/foo.png')->shouldReturn('https://amazon');
-    }
 }
diff --git a/src/Resolvable/ResolvableFilesystem.php b/src/Resolvable/ResolvableFilesystem.php
index e15b1a2..b36695f 100644
--- a/src/Resolvable/ResolvableFilesystem.php
+++ b/src/Resolvable/ResolvableFilesystem.php
@@ -4,6 +4,26 @@
 
 use Gaufrette\FilesystemInterface;
 
+/**
+ * Filesystem decorator providing resolve() method to resolve an object path into URI.
+ *
+ * Example:
+ *     $client     = // AwsS3 client instantiation
+ *     $decorated  = new Filesystem(new AwsS3($client, 'my_bucket', ['directory' => 'root/dir']));
+ *     $filesystem = new ResolvableFilesystem(
+ *         $decorated,
+ *         new AwsS3PresignedUrlResolver($client, 'my_bucket', 'root/dir')
+ *     );
+ *
+ *      try {
+ *          // should return something like "https://eu-west-1.blabla.aws.com/my_bucket/root/dir/foo/bar.png?token
+ *          var_dump($filesystem->resolve('foo/bar.png'));
+ *      } catch (ResolverException $e) {
+ *
+ *      }
+ *
+ * @author Albin Kerouanton <albin.kerouanton@knplabs.com>
+ */
 class ResolvableFilesystem implements FilesystemInterface
 {
     /** @var FilesystemInterface */
diff --git a/src/Resolvable/Resolver/AwsS3PresignedUrlResolver.php b/src/Resolvable/Resolver/AwsS3PresignedUrlResolver.php
index f78e74c..907f65b 100644
--- a/src/Resolvable/Resolver/AwsS3PresignedUrlResolver.php
+++ b/src/Resolvable/Resolver/AwsS3PresignedUrlResolver.php
@@ -8,6 +8,8 @@
 /**
  * Resolves object paths into time-limited URLs, namely presigned URLs.
  *
+ * @author Albin Kerouanton <albin.kerouanton@knplabs.com>
+ *
  * @see http://docs.aws.amazon.com/AmazonS3/latest/dev/ShareObjectPreSignedURL.html
  */
 class AwsS3PresignedUrlResolver implements ResolverInterface
@@ -43,10 +45,20 @@ public function __construct(S3Client $service, $bucket, $baseDir, \DateTimeInter
      *
      * @param string $path
      *
-     * @return (string) \Psr\Http\Message\UriInterface
+     * @return string
      */
     public function resolve($path)
     {
+        // For AWS SDK v2
+        if ($this->service instanceof \Aws\Common\Client\AbstractClient) {
+            return $this->service->getObjectUrl(
+                $this->bucket,
+                $this->computePath($path),
+                $this->expiresAt
+            );
+        }
+
+        // For AWS SDK v3
         $command = $this->service->getCommand('GetObject', [
             'Bucket' => $this->bucket,
             'Key'    => $this->computePath($path),
diff --git a/src/Resolvable/Resolver/AwsS3PublicUrlResolver.php b/src/Resolvable/Resolver/AwsS3PublicUrlResolver.php
index 2f14642..dcd0332 100644
--- a/src/Resolvable/Resolver/AwsS3PublicUrlResolver.php
+++ b/src/Resolvable/Resolver/AwsS3PublicUrlResolver.php
@@ -6,7 +6,9 @@
 use Gaufrette\Extras\Resolvable\ResolverInterface;
 
 /**
- * Resolves objects' path into public URLs.
+ * Resolves path of public objects into URLs.
+ *
+ * @author Albin Kerouanton <albin.kerouanton@knplabs.com>
  */
 class AwsS3PublicUrlResolver implements ResolverInterface
 {
diff --git a/src/Resolvable/Resolver/StaticUrlResolver.php b/src/Resolvable/Resolver/StaticUrlResolver.php
index e696265..d060c78 100644
--- a/src/Resolvable/Resolver/StaticUrlResolver.php
+++ b/src/Resolvable/Resolver/StaticUrlResolver.php
@@ -6,6 +6,8 @@
 
 /**
  * Resolves object path by prepending a static prefix.
+ *
+ * @author Albin Kerouanton <albin.kerouanton@knplabs.com>
  */
 class StaticUrlResolver implements ResolverInterface
 {
diff --git a/src/Resolvable/ResolverException.php b/src/Resolvable/ResolverException.php
index 62643d6..e4d5ba5 100644
--- a/src/Resolvable/ResolverException.php
+++ b/src/Resolvable/ResolverException.php
@@ -2,6 +2,11 @@
 
 namespace Gaufrette\Extras\Resolvable;
 
+/**
+ * Base exception thrown by resolvers if they fail to resolve an object path into URI.
+ *
+ * @author Albin Kerouanton <albin.kerouanton@knplabs.com>
+ */
 class ResolverException extends \Exception
 {
 }
diff --git a/src/Resolvable/ResolverInterface.php b/src/Resolvable/ResolverInterface.php
index 0d0beb4..45ac255 100644
--- a/src/Resolvable/ResolverInterface.php
+++ b/src/Resolvable/ResolverInterface.php
@@ -2,6 +2,11 @@
 
 namespace Gaufrette\Extras\Resolvable;
 
+/**
+ * Resolves an object path into an URI.
+ *
+ * @author Albin Kerouanton <albin.kerouanton@knplabs.com>
+ */
 interface ResolverInterface
 {
     /**
diff --git a/src/Resolvable/UnresolvableObjectException.php b/src/Resolvable/UnresolvableObjectException.php
index a0f7697..e4c8b22 100644
--- a/src/Resolvable/UnresolvableObjectException.php
+++ b/src/Resolvable/UnresolvableObjectException.php
@@ -2,6 +2,11 @@
 
 namespace Gaufrette\Extras\Resolvable;
 
+/**
+ * Exception thrown by the filesystem when resolution fail.
+ *
+ * @author Albin Kerouanton <albin.kerouanton@knplabs.com>
+ */
 class UnresolvableObjectException extends \Exception
 {
     /**
diff --git a/tests/Resolvable/Resolver/AwsS3SetUpTearDownTrait.php b/tests/Resolvable/Resolver/AwsS3SetUpTearDownTrait.php
index 3fd8807..5810578 100644
--- a/tests/Resolvable/Resolver/AwsS3SetUpTearDownTrait.php
+++ b/tests/Resolvable/Resolver/AwsS3SetUpTearDownTrait.php
@@ -27,6 +27,18 @@ public function setUp()
         }
 
         $this->bucket = uniqid(getenv('AWS_BUCKET'));
+
+        // For AWS SDK v2
+        if (class_exists('Aws\Common\Client\AbstractClient')) {
+            return $this->client = S3Client::factory([
+                'region' => $region ? $region : 'eu-west-1',
+                'version' => '2006-03-01',
+                'key' => $key,
+                'secret' => $secret,
+            ]);
+        }
+
+        // For AWS SDK v3
         $this->client = new S3Client([
             'region'      => $region ? $region : 'eu-west-1',
             'version'     => 'latest',