diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ceeb08..ee99c34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 - No unreleased changes!
 
+## [0.2.10]
+### Changed
+- Update API handler to accept zero padded day numbers  ([#34](https://github.com/pacso/aoc_rb/pull/34) by [@YozuChris](https://github.com/YozuChris))
+
 ## [0.2.9]
 ### Changed
 - Added missing require to `lib/aoc_rb/app.rb` ([#33](https://github.com/pacso/aoc_rb/pull/33) by [@pacso](https://github.com/pacso))
@@ -74,7 +78,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 Initial release.
 
-[Unreleased]: https://github.com/pacso/aoc_rb/compare/v0.2.9...HEAD
+[Unreleased]: https://github.com/pacso/aoc_rb/compare/v0.2.10...HEAD
+[0.2.10]: https://github.com/pacso/aoc_rb/compare/v0.2.9...v0.2.10
 [0.2.9]: https://github.com/pacso/aoc_rb/compare/v0.2.8...v0.2.9
 [0.2.8]: https://github.com/pacso/aoc_rb/compare/v0.2.7...v0.2.8
 [0.2.7]: https://github.com/pacso/aoc_rb/compare/v0.2.6...v0.2.7
diff --git a/lib/aoc_rb/aoc_api.rb b/lib/aoc_rb/aoc_api.rb
index 91c364f..ff2cab5 100644
--- a/lib/aoc_rb/aoc_api.rb
+++ b/lib/aoc_rb/aoc_api.rb
@@ -24,7 +24,7 @@ def submit_answer(year, day, level, answer)
 
     private
       def puzzle_path(year, day)
-        "/#{year}/day/#{day}"
+        "/#{year}/day/#{day.to_i}"
       end
 
       def input_path(year, day)
diff --git a/lib/aoc_rb/version.rb b/lib/aoc_rb/version.rb
index 957a635..b88e764 100644
--- a/lib/aoc_rb/version.rb
+++ b/lib/aoc_rb/version.rb
@@ -1,3 +1,3 @@
 module AocRb
-  VERSION = "0.2.9"
+  VERSION = "0.2.10"
 end
diff --git a/spec/lib/aoc_rb/api_spec.rb b/spec/lib/aoc_rb/api_spec.rb
new file mode 100644
index 0000000..ede56f9
--- /dev/null
+++ b/spec/lib/aoc_rb/api_spec.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe AocRb::AocApi do
+  let(:session_token) { "test_session_token" }
+  let(:year) { 2024 }
+  let(:level) { 1 }
+  let(:answer) { "42" }
+  let(:api) { described_class.new(session_token) }
+
+  shared_examples "consistent day path" do |day_input, expected_day|
+    let(:expected_headers) { { 'Cookie' => "session=#{session_token}" } }
+
+    describe "#puzzle_instructions" do
+      let(:expected_path) { "/2024/day/#{expected_day}" }
+
+      before do
+        allow(api.class).to receive(:get).and_return(double('Response', body: ''))
+      end
+
+      it "sends the request to the correct uri" do
+        api.puzzle_instructions(year, day_input)
+        expect(api.class).to have_received(:get).with(expected_path, hash_including(headers: expected_headers))
+      end
+    end
+
+    describe "#puzzle_input" do
+      let(:expected_path) { "/2024/day/#{expected_day}/input" }
+
+      before do
+        allow(api.class).to receive(:get).and_return(double('Response', body: ''))
+      end
+
+      it "sends the request to the correct uri" do
+        api.puzzle_input(year, day_input)
+        expect(api.class).to have_received(:get).with(expected_path, hash_including(headers: expected_headers))
+      end
+    end
+
+    describe "#submit_answer" do
+      let(:expected_path) { "/2024/day/#{expected_day}/answer" }
+      let(:expected_body) { { level: level.to_s, answer: answer.to_s } }
+
+      before do
+        allow(api.class).to receive(:post).and_return(double('Response', body: ''))
+      end
+
+      it "sends the request to the correct uri" do
+        api.submit_answer(year, day_input, level, answer)
+        expect(api.class).to have_received(:post).with(expected_path, hash_including(headers: expected_headers, body: expected_body))
+      end
+    end
+  end
+
+  context "when day is an integer" do
+    include_examples "consistent day path", 1, 1
+    include_examples "consistent day path", 17, 17
+  end
+
+  context "when day is a two-character string" do
+    include_examples "consistent day path", "01", 1
+    include_examples "consistent day path", "22", 22
+  end
+
+  context "when day is a single character string" do
+    include_examples "consistent day path", "8", 8
+  end
+end
diff --git a/spec/lib/aoc_rb_spec.rb b/spec/lib/aoc_rb_spec.rb
index 813d093..aeb21fb 100644
--- a/spec/lib/aoc_rb_spec.rb
+++ b/spec/lib/aoc_rb_spec.rb
@@ -4,6 +4,6 @@
 
 RSpec.describe AocRb do
   it "has the expected version number" do
-    expect(AocRb::VERSION).to eq "0.2.9"
+    expect(AocRb::VERSION).to eq "0.2.10"
   end
 end