diff --git a/spec/controllers/spree/admin/tax_rates_controller_spec.rb b/spec/controllers/spree/admin/tax_rates_controller_spec.rb
index 266edc9430..8bef1f2fb1 100644
--- a/spec/controllers/spree/admin/tax_rates_controller_spec.rb
+++ b/spec/controllers/spree/admin/tax_rates_controller_spec.rb
@@ -20,7 +20,7 @@ module Spree
           context "when the amount is not changed" do
             it "updates the record" do
               expect {
-                spree_put :update, id: tax_rate.id, tax_rate: { name: "Updated Rate", amount: 0.1 }
+                spree_put :update, id: tax_rate.id, tax_rate: { name: "Updated Rate", amount: "0.1" }
               }.to_not change{ Spree::TaxRate.with_deleted.count }
 
               expect(response).to redirect_to spree.admin_tax_rates_url
@@ -32,7 +32,7 @@ module Spree
           context "when the amount is changed" do
             it "duplicates the record and soft-deletes the duplicate" do
               expect {
-                spree_put :update, id: tax_rate.id, tax_rate: { name: "Changed Rate", amount: 0.5 }
+                spree_put :update, id: tax_rate.id, tax_rate: { name: "Changed Rate", amount: "0.5" }
               }.to change{ Spree::TaxRate.with_deleted.count }.by(1)
 
               expect(response).to redirect_to spree.admin_tax_rates_url