diff --git a/CHANGELOG.md b/CHANGELOG.md
index 647266f..bfa6a99 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,22 @@
+## [1.0.0] - 2023-06-27
+
+### Changed
+
+### Breaking Change
+Updated method signatures in the gem to use keyword arguments instead of named arguments.
+
+###### Specifically
+`MonopayRuby::Invoices::SimpleInvoice::new` method was affected by this change.
+###### Previously
+the method was called like `new("redirect/url", "webhook/url")`. Now, it should be called like `new(redirect_url: "redirect/url", webhook_url: "webhook/url")`.
+#### Note
+This is a breaking change and will require updating your code if you are updating to this version of the gem from an earlier version.
+
 ## [0.1.1] - 2023-06-19
 
 - Fix typo in a `README.md` file
-- add ability to pass reference to an invoice by `reference` parameter in a `MonopayRuby::Invoices::SimpleInvoice::create` method
-- Use named parameter of `destionation` for "MonopayRuby::Invoices::SimpleInvoice::create" method
+- Add ability to pass reference to an invoice by `reference` parameter in a `MonopayRuby::Invoices::SimpleInvoice::create` method
+- Use keyword parameter of `destination` for "MonopayRuby::Invoices::SimpleInvoice::create" method
 
 ## [0.1.0] - 2023-06-18
 
diff --git a/Gemfile.lock b/Gemfile.lock
index c95ea4c..863fd18 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    monopay-ruby (0.1.1)
+    monopay-ruby (1.0.0)
       base64 (~> 0.1.1)
       json (~> 2.5)
       money (~> 6.13)
diff --git a/lib/monopay-ruby/invoices/simple_invoice.rb b/lib/monopay-ruby/invoices/simple_invoice.rb
index c8fa0c6..9d6cf8a 100644
--- a/lib/monopay-ruby/invoices/simple_invoice.rb
+++ b/lib/monopay-ruby/invoices/simple_invoice.rb
@@ -17,7 +17,7 @@ class SimpleInvoice < MonopayRuby::Base
       #
       # @param [String] redirect_url - url where user will be redirected after payment
       # @param [String] webhook_url - url where Monobank will send webhook after payment
-      def initialize(redirect_url = nil, webhook_url = nil)
+      def initialize(redirect_url: nil, webhook_url: nil)
         @redirect_url = redirect_url
         @webhook_url = webhook_url
 
diff --git a/lib/monopay-ruby/version.rb b/lib/monopay-ruby/version.rb
index c8194d3..e55885d 100644
--- a/lib/monopay-ruby/version.rb
+++ b/lib/monopay-ruby/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module MonopayRuby
-  VERSION = "0.1.1"
+  VERSION = "1.0.0"
 end
diff --git a/spec/lib/invoices/simple_invoice_spec.rb b/spec/lib/invoices/simple_invoice_spec.rb
index 5d5c6fe..676c5e4 100644
--- a/spec/lib/invoices/simple_invoice_spec.rb
+++ b/spec/lib/invoices/simple_invoice_spec.rb
@@ -1,6 +1,37 @@
 # frozen_string_literal: true
 
 RSpec.describe MonopayRuby::Invoices::SimpleInvoice do
+  describe "#new" do
+    let!(:redirect_url) { "https://redirect.example.com" }
+    let!(:webhook_url) { "https://webhook.example.com" }
+
+    context "with keyword parameters" do
+      subject { described_class.new(redirect_url: redirect_url, webhook_url: webhook_url) }
+
+      it "initializes with correct redirect_url" do
+        expect(subject.redirect_url).to eq(redirect_url)
+      end
+
+      it "initializes with correct webhook_url" do
+        expect(subject.webhook_url).to eq(webhook_url)
+      end
+    end
+
+    context "without keyword parameters" do
+      subject { described_class.new(redirect_url, webhook_url) }
+
+      it "raises an ArgumentError" do
+        expect { subject }.to raise_error(ArgumentError)
+      end
+    end
+
+    context "without parameters" do
+      subject { described_class.new }
+
+      it { is_expected.to be_a(described_class) }
+    end
+  end
+
   describe "#create" do
     context "when request is successful" do
       let(:simple_invoice_instance) { described_class.new }