Appraisals in spree_mollie_gateway-3.2.1 vs Appraisals in spree_mollie_gateway-4.0.0

@@ -8,6 +8,12 @@
   gem 'spree', '~> 3.6.5'
 end
 
 appraise 'spree-3-7' do
   gem 'spree', '~> 3.7.2'
+end
+
+appraise 'spree-4-0' do
+  gem 'spree', '~> 4.0.3'
+  gem 'spree_api', '~> 4.0.3'
+  gem 'rails', '~> 6.0.0'
 end
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