diff --git a/app/AlbumSources/AmazonS3Source.php b/app/AlbumSources/AmazonS3Source.php
index 9ac3164..948c534 100644
--- a/app/AlbumSources/AmazonS3Source.php
+++ b/app/AlbumSources/AmazonS3Source.php
@@ -4,9 +4,10 @@ namespace App\AlbumSources;
 
 use App\Helpers\MiscHelper;
 use App\Photo;
-use Guzzle\Http\EntityBody;
-use Guzzle\Http\Exception\ClientErrorResponseException;
+use GuzzleHttp\Exception\GuzzleException;
+use GuzzleHttp\Psr7\Stream;
 use Illuminate\Support\Facades\Log;
+use function GuzzleHttp\Psr7\stream_for;
 
 class AmazonS3Source extends AlbumSourceBase implements IAlbumSource, IAnalysisQueueSource
 {
@@ -37,7 +38,7 @@ class AmazonS3Source extends AlbumSourceBase implements IAlbumSource, IAnalysisQ
                 'Key' => $fileToDelete
             ]);
         }
-        catch (ClientErrorResponseException $ex)
+        catch (GuzzleException $ex)
         {
             // Don't worry if the file no longer exists
             Log::warning('Failed deleting image from S3.', ['error' => $ex->getMessage(), 'path' => $fileToDelete]);
@@ -61,7 +62,7 @@ class AmazonS3Source extends AlbumSourceBase implements IAlbumSource, IAnalysisQ
                 'Key' => $this->getPathToPhoto($photo, $thumbnail)
             ]);
         }
-        catch (ClientErrorResponseException $ex)
+        catch (GuzzleException $ex)
         {
             // Don't worry if the file no longer exists
             Log::warning('Failed deleting image from S3.', ['error' => $ex->getMessage(), 'path' => $photoPath]);
@@ -91,7 +92,7 @@ class AmazonS3Source extends AlbumSourceBase implements IAlbumSource, IAnalysisQ
      * Fetches the contents of a thumbnail for a photo.
      * @param Photo $photo Photo to fetch the thumbnail for.
      * @param string $thumbnail Thumbnail to fetch (or null to fetch the original.)
-     * @return EntityBody
+     * @return Stream
      */
     public function fetchPhotoContent(Photo $photo, $thumbnail = null)
     {
@@ -105,7 +106,7 @@ class AmazonS3Source extends AlbumSourceBase implements IAlbumSource, IAnalysisQ
                 'SaveAs' => $tempFile
             ]);
 
-            return EntityBody::factory(fopen($tempFile, 'r+'));
+            return stream_for(fopen($tempFile, 'r+'));
         }
         finally
         {
diff --git a/app/AlbumSources/BackblazeB2Source.php b/app/AlbumSources/BackblazeB2Source.php
index b206c1a..2058bfc 100644
--- a/app/AlbumSources/BackblazeB2Source.php
+++ b/app/AlbumSources/BackblazeB2Source.php
@@ -6,8 +6,9 @@ use App\BackblazeB2FileIdCache;
 use App\Photo;
 use App\Services\BackblazeB2Service;
 use App\Storage;
-use Guzzle\Http\EntityBody;
+use GuzzleHttp\Psr7\Stream;
 use Illuminate\Support\Facades\Log;
+use function GuzzleHttp\Psr7\stream_for;
 
 class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
 {
@@ -67,7 +68,7 @@ class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
      * Fetches the contents of a thumbnail for a photo.
      * @param Photo $photo Photo to fetch the thumbnail for.
      * @param string $thumbnail Thumbnail to fetch (or null to fetch the original.)
-     * @return EntityBody
+     * @return Stream
      */
     public function fetchPhotoContent(Photo $photo, $thumbnail = null)
     {
@@ -78,12 +79,10 @@ class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
         $b2Cache = $this->getB2FileFromCache($pathOnStorage);
         if (is_null($b2Cache))
         {
-            return EntityBody::fromString('');
+            return stream_for('');
         }
 
-        return EntityBody::fromString(
-            $this->getClient()->downloadFile($b2Cache->b2_file_id)
-        );
+        return stream_for($this->getClient()->downloadFile($b2Cache->b2_file_id));
     }
 
     /**
diff --git a/app/AlbumSources/DropboxSource.php b/app/AlbumSources/DropboxSource.php
index 2b67ea9..6098826 100644
--- a/app/AlbumSources/DropboxSource.php
+++ b/app/AlbumSources/DropboxSource.php
@@ -4,7 +4,8 @@ namespace App\AlbumSources;
 
 use App\Photo;
 use App\Services\DropboxService;
-use Guzzle\Http\EntityBody;
+use GuzzleHttp\Psr7\Stream;
+use function GuzzleHttp\Psr7\stream_for;
 
 class DropboxSource extends AlbumSourceBase implements IAlbumSource
 {
@@ -37,13 +38,13 @@ class DropboxSource extends AlbumSourceBase implements IAlbumSource
      * Fetches the contents of a thumbnail for a photo.
      * @param Photo $photo Photo to fetch the thumbnail for.
      * @param string $thumbnail Thumbnail to fetch (or null to fetch the original.)
-     * @return EntityBody
+     * @return Stream
      */
     public function fetchPhotoContent(Photo $photo, $thumbnail = null)
     {
         $pathOnStorage = $this->getPathToPhoto($photo, $thumbnail);
 
-        return EntityBody::fromString($this->getClient()->downloadFile($pathOnStorage));
+        return stream_for($this->getClient()->downloadFile($pathOnStorage));
     }
 
     /**
diff --git a/app/AlbumSources/IAlbumSource.php b/app/AlbumSources/IAlbumSource.php
index aecce32..f96e8a7 100644
--- a/app/AlbumSources/IAlbumSource.php
+++ b/app/AlbumSources/IAlbumSource.php
@@ -5,7 +5,7 @@ namespace App\AlbumSources;
 use App\Album;
 use App\Photo;
 use App\Storage;
-use Guzzle\Http\EntityBody;
+use GuzzleHttp\Psr7\Stream;
 
 interface IAlbumSource
 {
@@ -27,7 +27,7 @@ interface IAlbumSource
      * Fetches the contents of a thumbnail for a photo.
      * @param Photo $photo Photo to fetch the thumbnail for.
      * @param string $thumbnail Thumbnail to fetch (or null to fetch the original.)
-     * @return EntityBody
+     * @return Stream
      */
     function fetchPhotoContent(Photo $photo, $thumbnail = null);
 
diff --git a/app/AlbumSources/LocalFilesystemSource.php b/app/AlbumSources/LocalFilesystemSource.php
index fae811b..7fd012d 100644
--- a/app/AlbumSources/LocalFilesystemSource.php
+++ b/app/AlbumSources/LocalFilesystemSource.php
@@ -5,8 +5,9 @@ namespace App\AlbumSources;
 use App\Helpers\FileHelper;
 use App\Helpers\MiscHelper;
 use App\Photo;
-use Guzzle\Http\EntityBody;
+use GuzzleHttp\Psr7\Stream;
 use Symfony\Component\HttpFoundation\File\File;
+use function GuzzleHttp\Psr7\stream_for;
 
 /**
  * Driver for managing files on the local filesystem.
@@ -37,7 +38,7 @@ class LocalFilesystemSource extends AlbumSourceBase implements IAlbumSource, IAn
      * Fetches the contents of a thumbnail for a photo.
      * @param Photo $photo Photo to fetch the thumbnail for.
      * @param string $thumbnail Thumbnail to fetch (or null to fetch the original.)
-     * @return EntityBody
+     * @return Stream
      */
     public function fetchPhotoContent(Photo $photo, $thumbnail = null)
     {
@@ -50,7 +51,7 @@ class LocalFilesystemSource extends AlbumSourceBase implements IAlbumSource, IAn
             'r+'
         );
 
-        return EntityBody::factory($fh);
+        return stream_for($fh);
     }
 
     public function getName()
diff --git a/app/AlbumSources/OpenStackSource.php b/app/AlbumSources/OpenStackSource.php
index d3b99ee..9b09b7c 100644
--- a/app/AlbumSources/OpenStackSource.php
+++ b/app/AlbumSources/OpenStackSource.php
@@ -3,12 +3,11 @@
 namespace App\AlbumSources;
 
 use App\Photo;
-use Guzzle\Http\EntityBody;
-use Guzzle\Http\Exception\ClientErrorResponseException;
+use GuzzleHttp\Exception\GuzzleException;
+use GuzzleHttp\Psr7\Stream;
 use Illuminate\Support\Facades\Log;
-use OpenCloud\ObjectStore\Exception\ObjectNotFoundException;
-use OpenCloud\OpenStack;
-use Symfony\Component\HttpFoundation\File\File;
+use OpenStack\OpenStack;
+use function GuzzleHttp\Psr7\stream_for;
 
 /**
  * Driver for managing files on an OpenStack Keystone+Swift compatible platform.
@@ -40,7 +39,7 @@ class OpenStackSource extends AlbumSourceBase implements IAlbumSource
         {
             $this->getContainer()->deleteObject($photoPath);
         }
-        catch (ClientErrorResponseException $ex)
+        catch (GuzzleException $ex)
         {
             // Don't worry if the file no longer exists
             Log::warning('Failed deleting image from OpenStack.', ['error' => $ex->getMessage(), 'path' => $photoPath]);
@@ -51,13 +50,13 @@ class OpenStackSource extends AlbumSourceBase implements IAlbumSource
      * Fetches the contents of a thumbnail for a photo.
      * @param Photo $photo Photo to fetch the thumbnail for.
      * @param string $thumbnail Thumbnail to fetch (or null to fetch the original.)
-     * @return EntityBody
+     * @return Stream
      */
     public function fetchPhotoContent(Photo $photo, $thumbnail = null)
     {
         $object = $this->getContainer()->getObject($this->getPathToPhoto($photo, $thumbnail));
 
-        return $object->getContent();
+        return stream_for($object->getContent());
     }
 
     /**
diff --git a/app/AlbumSources/RackspaceSource.php b/app/AlbumSources/RackspaceSource.php
index bcb42ee..62e7277 100644
--- a/app/AlbumSources/RackspaceSource.php
+++ b/app/AlbumSources/RackspaceSource.php
@@ -3,8 +3,6 @@
 namespace App\AlbumSources;
 
 use App\Photo;
-use App\Storage;
-use OpenCloud\Rackspace;
 
 class RackspaceSource extends OpenStackSource
 {
diff --git a/app/Http/Controllers/Gallery/PhotoController.php b/app/Http/Controllers/Gallery/PhotoController.php
index 98a3eb8..334f348 100644
--- a/app/Http/Controllers/Gallery/PhotoController.php
+++ b/app/Http/Controllers/Gallery/PhotoController.php
@@ -6,17 +6,15 @@ use App\Album;
 use App\Facade\Theme;
 use App\Facade\UserConfig;
 use App\Helpers\DbHelper;
-use App\Helpers\MiscHelper;
-use app\Http\Controllers\Admin\AlbumController;
 use App\Http\Controllers\Controller;
-use App\Http\Middleware\VerifyCsrfToken;
 use App\Photo;
 use App\VisitorHit;
-use Guzzle\Http\Mimetypes;
+use GuzzleHttp\Psr7\Stream;
 use Illuminate\Support\Facades\App;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Gate;
 use Symfony\Component\HttpFoundation\Request;
+use function GuzzleHttp\Psr7\mimetype_from_extension;
 
 class PhotoController extends Controller
 {
@@ -71,8 +69,9 @@ class PhotoController extends Controller
             });
         }
 
+        /** @var Stream $photoStream */
         $photoStream = $album->getAlbumSource()->fetchPhotoContent($photo, $thumbnail);
-        $mimeType = Mimetypes::getInstance()->fromFilename($photo->storage_file_name);
+        $mimeType = mimetype_from_extension(pathinfo($photo->storage_file_name, PATHINFO_EXTENSION));
 
         return response()->stream(
             function() use ($photoStream)
@@ -81,7 +80,7 @@ class PhotoController extends Controller
             },
             200,
             [
-                'Content-Length' => $photoStream->getContentLength(),
+                'Content-Length' => strlen($photoStream->getContents()),
                 'Content-Type' => $mimeType
             ]
         );
diff --git a/app/Services/PhotoService.php b/app/Services/PhotoService.php
index 59055fd..6dbcb11 100644
--- a/app/Services/PhotoService.php
+++ b/app/Services/PhotoService.php
@@ -6,12 +6,10 @@ use App\Album;
 use App\AlbumSources\IAlbumSource;
 use App\AlbumSources\IAnalysisQueueSource;
 use App\Helpers\AnalysisQueueHelper;
-use App\Helpers\FileHelper;
 use App\Helpers\ImageHelper;
 use App\Helpers\MiscHelper;
 use App\Helpers\ThemeHelper;
 use App\Photo;
-use Symfony\Component\HttpFoundation\File\File;
 
 class PhotoService
 {
@@ -207,7 +205,7 @@ class PhotoService
 
         $stream = $this->albumSource->fetchPhotoContent($this->photo);
         $stream->rewind();
-        while (!$stream->feof())
+        while (!$stream->eof())
         {
             fwrite($photoHandle, $stream->read(4096));
         }
@@ -326,7 +324,7 @@ class PhotoService
 
         $stream = $this->albumSource->fetchPhotoContent($this->photo);
         $stream->rewind();
-        while (!$stream->feof())
+        while (!$stream->eof())
         {
             fwrite($photoHandle, $stream->read(4096));
         }
diff --git a/composer.json b/composer.json
index 5f90ee5..13e17ba 100644
--- a/composer.json
+++ b/composer.json
@@ -10,6 +10,7 @@
         "ext-json": "*",
         "aws/aws-sdk-php": "^3.134",
         "doctrine/dbal": "^2.5",
+        "guzzlehttp/guzzle": "^6.5",
         "laravel/framework": "^6.0",
         "laravel/socialite": "^4.3",
         "php-amqplib/php-amqplib": "^2.9",
diff --git a/composer.lock b/composer.lock
index f1379b0..41a6105 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "62c34970835f89cbd6bb144d978a42c0",
+    "content-hash": "9a11d044f41aef4c08fcddf00fd6f7ed",
     "packages": [
         {
             "name": "aws/aws-sdk-php",