diff --git a/.travis.yml b/.travis.yml
index fbad42e..e438a90 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,10 @@ addons:
     - libcurl4-openssl-dev
 
 language: php
+dist: focal
 php:
+  - 8.1.0
+  - 8.0
   - 7.4
 
 before_script:
diff --git a/src/Api.php b/src/Api.php
index 0286b98..c5ec8e6 100644
--- a/src/Api.php
+++ b/src/Api.php
@@ -263,7 +263,7 @@ class Api
                 }
             }
 
-            $query = \GuzzleHttp\Psr7\build_query($query);
+            $query = \GuzzleHttp\Psr7\Query::build($query);
 
             $url     = $request->getUri()->withQuery($query);
             $request = $request->withUri($url);