diff --git a/composer-dist.json b/composer-dist.json
index 400cc5b6f..d93dcba68 100644
--- a/composer-dist.json
+++ b/composer-dist.json
@@ -26,6 +26,7 @@
         "zf1/zend-search-lucene": "*",
         "symfony/http-foundation": "^5.4",
         "php-di/php-di": "^6.4",
+        "slim/psr7": "^1.7",
         "seeddms/core": "dev-master",
         "seeddms/lucene": "dev-master",
         "seeddms/preview": "dev-master",
diff --git a/restapi/index.php b/restapi/index.php
index 8540a0924..92ebf2ac0 100644
--- a/restapi/index.php
+++ b/restapi/index.php
@@ -1296,7 +1296,7 @@ final class SeedDMS_RestapiController { /* {{{ */
                     if(!($fh = @fopen($file, 'rb'))) {
                         return $this->renderer->json($response, array('success'=>false, 'message'=>'', 'data'=>''))->withStatus(500);
                     }
-                    $stream = new \Slim\Http\Stream($fh); // create a stream instance for the response body
+                    $stream = new \Slim\Psr7\Stream($fh); // create a stream instance for the response body
 
                     return $response->withHeader('Content-Type', $lc->getMimeType())
                         ->withHeader('Content-Description', 'File Transfer')
@@ -1372,7 +1372,7 @@ final class SeedDMS_RestapiController { /* {{{ */
                     if(!($fh = @fopen($file, 'rb'))) {
                         return $this->renderer->json($response, array('success'=>false, 'message'=>'', 'data'=>''))->withStatus(500);
                     }
-                    $stream = new \Slim\Http\Stream($fh); // create a stream instance for the response body
+                    $stream = new \Slim\Psr7\Stream($fh); // create a stream instance for the response body
 
                     return $response->withHeader('Content-Type', $lc->getMimeType())
                         ->withHeader('Content-Description', 'File Transfer')
@@ -1477,7 +1477,7 @@ final class SeedDMS_RestapiController { /* {{{ */
                     if(!($fh = @fopen($file, 'rb'))) {
                         return $this->renderer->json($response, array('success'=>false, 'message'=>'', 'data'=>''))->withStatus(500);
                     }
-                    $stream = new \Slim\Http\Stream($fh); // create a stream instance for the response body
+                    $stream = new \Slim\Psr7\Stream($fh); // create a stream instance for the response body
 
                     return $response->withHeader('Content-Type', $lc->getMimeType())
                           ->withHeader('Content-Description', 'File Transfer')
@@ -1623,7 +1623,7 @@ final class SeedDMS_RestapiController { /* {{{ */
                 if(!($fh = @fopen($file, 'rb'))) {
                   return $this->renderer->json($response, array('success'=>false, 'message'=>'', 'data'=>''))->withStatus(500);
                 }
-                $stream = new \Slim\Http\Stream($fh); // create a stream instance for the response body
+                $stream = new \Slim\Psr7\Stream($fh); // create a stream instance for the response body
 
                 return $response->withHeader('Content-Type', 'image/png')
                       ->withHeader('Content-Description', 'File Transfer')