diff --git a/composer.json b/composer.json
index 10ad1ae..09a1bf6 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     "source": "http://cgit.drupalcode.org/sparkpost"
   },
   "require": {
-    "php-http/guzzle6-adapter": "^1.1",
+    "php-http/guzzle6-adapter": "^1.1 || ^2.0",
     "sparkpost/sparkpost": "^2.0"
   }
 }
diff --git a/sparkpost.info.yml b/sparkpost.info.yml
index fc5b437..10b68e1 100644
--- a/sparkpost.info.yml
+++ b/sparkpost.info.yml
@@ -2,6 +2,6 @@ name: Sparkpost
 type: module
 description: Integrates Drupal site with Sparkpost - transactional mail service.
 core: 8.x
-core_version_requirement: ^8 || ^9
+core_version_requirement: ^8 || ^9 || ^10
 package: Sparkpost
 configure: sparkpost.settings_form