diff --git a/composer.json b/composer.json
index e80f2f0..89ebc89 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "psr/http-message": "^1.0"
     },
     "require-dev": {
-        "guzzlehttp/psr7": "^1.4",
+        "guzzlehttp/psr7": "^1.7 || ^2.0",
         "laminas/laminas-diactoros": "^2.1",
         "nyholm/psr7": "^1.0",
         "ringcentral/psr7": "^1.2",
diff --git a/src/BaseTest.php b/src/BaseTest.php
index 2afcea5..43dd292 100644
--- a/src/BaseTest.php
+++ b/src/BaseTest.php
@@ -76,7 +76,7 @@ protected function buildStream($data)
         }
 
         if (class_exists(GuzzleStream::class)) {
-            return \GuzzleHttp\Psr7\stream_for($data);
+            return \GuzzleHttp\Psr7\Utils::streamFor($data);
         }
 
         if (class_exists(ZendStream::class)) {
diff --git a/tests/Guzzle/StreamTest.php b/tests/Guzzle/StreamTest.php
index 26c90a5..f71329f 100644
--- a/tests/Guzzle/StreamTest.php
+++ b/tests/Guzzle/StreamTest.php
@@ -8,6 +8,6 @@ class StreamTest extends StreamIntegrationTest
 {
     public function createStream($data)
     {
-        return \GuzzleHttp\Psr7\stream_for($data);
+        return \GuzzleHttp\Psr7\Utils::streamFor($data);
     }
 }
diff --git a/tests/Guzzle/UploadedFileTest.php b/tests/Guzzle/UploadedFileTest.php
index 486e42a..9ef6326 100644
--- a/tests/Guzzle/UploadedFileTest.php
+++ b/tests/Guzzle/UploadedFileTest.php
@@ -9,7 +9,7 @@ class UploadedFileTest extends UploadedFileIntegrationTest
 {
     public function createSubject()
     {
-        $stream = \GuzzleHttp\Psr7\stream_for('Foobar');
+        $stream = \GuzzleHttp\Psr7\Utils::streamFor('Foobar');
 
         return new UploadedFile($stream, $stream->getSize(), UPLOAD_ERR_OK, 'filename.txt', 'text/plain');
     }
diff --git a/tests/RingCentral/StreamTest.php b/tests/RingCentral/StreamTest.php
index 0c3532b..6786219 100644
--- a/tests/RingCentral/StreamTest.php
+++ b/tests/RingCentral/StreamTest.php
@@ -8,6 +8,6 @@ class StreamTest extends StreamIntegrationTest
 {
     public function createStream($data)
     {
-        return \RingCentral\Psr7\stream_for($data);
+        return \RingCentral\Psr7\Utils::streamFor($data);
     }
 }