diff --git a/Provider.php b/Provider.php
index ffcc1f5..8c73538 100644
--- a/Provider.php
+++ b/Provider.php
@@ -141,7 +141,7 @@ public function getRefreshTokenResponse(string $refreshToken)
             ],
         ]);
 
-        return json_decode($response->getBody()->getContents(), true);
+        return json_decode((string) $response->getBody(), true);
     }
 
     /**
@@ -232,6 +232,6 @@ public function introspectToken(string $token, string $hint = 'access_token')
             ],
         ]);
 
-        return json_decode($resp->getBody()->getContents(), true);
+        return json_decode((string) $resp->getBody(), true);
     }
 }