diff --git a/composer.json b/composer.json
index 0c089dc82baf..da8c5f7f5182 100644
--- a/composer.json
+++ b/composer.json
@@ -45,6 +45,7 @@
 		"doctrine/lexer": "^1.0",
 		"egulias/email-validator": "^2.1",
 		"guzzlehttp/guzzle": "^6.3.0",
+		"guzzlehttp/psr7": "^1.4.0",
 		"nikic/php-parser": "^4.10.4",
 		"phpdocumentor/reflection-docblock": "^5.2",
 		"phpdocumentor/type-resolver": "^1.3",
diff --git a/composer.lock b/composer.lock
index 197121a1be9f..41142e064184 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": "a7f5a2dcc1c6ef40e257560becaafc6a",
+    "content-hash": "664bdaf86dd7273cd840fa7eaa998893",
     "packages": [
         {
             "name": "cogpowered/finediff",
diff --git a/typo3/sysext/core/composer.json b/typo3/sysext/core/composer.json
index 857672ea574a..4000a3756a1b 100644
--- a/typo3/sysext/core/composer.json
+++ b/typo3/sysext/core/composer.json
@@ -33,6 +33,7 @@
 		"doctrine/lexer": "^1.0",
 		"egulias/email-validator": "^2.1",
 		"guzzlehttp/guzzle": "^6.3.0",
+		"guzzlehttp/psr7": "^1.4.0",
 		"nikic/php-parser": "^4.10.4",
 		"psr/container": "^1.0",
 		"psr/event-dispatcher": "^1.0",