diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 2c84a21..a28bf32 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['3.0', '3.2']
+        ruby-version: ['2.6', '2.7', '3.0', '3.2', '3.3']
 
     steps:
     - uses: actions/checkout@v3
diff --git a/.rubocop.yml b/.rubocop.yml
index 867c413..cdb341b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 2.6
 
 Metrics/BlockLength:
   Exclude:
diff --git a/CHANGES.md b/CHANGES.md
index eb24c89..6273bcb 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+## 0.2.0
+- Upgrade to Open Weather One Call API 3.0 through configuration option (#8)
+
 ## 0.1.6
 - Relax required Ruby Version
 
diff --git a/README.md b/README.md
index c395164..4c2a993 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 ![RSpec](https://github.com/qurasoft/open_weather_client/actions/workflows/ruby.yml/badge.svg)
 
 Welcome to Open Weather Client.
-This gem allows you to easily request weather information from OpenWeatherMap.
+This gem allows you to easily request weather information from Open Weather.
 It integrates in your rails project, when you are using bundler or even in plain ruby projects.
 
 ## Installation
@@ -24,7 +24,7 @@ Or install it yourself as:
     $ gem install open_weather_client
 
 ## Usage
-During configuration the OpenWeatherMap API key must be set. Afterwards it is as simple as calling `OpenWeatherClient.current(lat:, lon:)` to get the current weather at a location.
+During configuration the Open Weather API key must be set. Afterwards it is as simple as calling `OpenWeatherClient.current(lat:, lon:)` to get the current weather at a location.
 
 ```ruby
 # OpenWeatherClient initializer
@@ -36,13 +36,32 @@ end
 OpenWeatherClient::Weather.current(lat: 50.3569, lon: 7.5890)
 ```
 
+### Used Open Weather API version
+Open Weather provides One Call API 3.0 and API 2.5, which is expected to be deprecated in June 2024.
+Until API 2.5 is deprecated it is the default. With Open Weather Client version 1.0 the default will change to One Call API 3.0.
+
+The used API version is configurable through `OpenWeatherClient.configuration.api_version`.
+
+```ruby
+# OpenWeatherClient initializer
+OpenWeatherClient.configure do |config|
+  config.api_version = :v25 # (default) also supports :v30
+end
+```
+
 ### Exceptions during requests
 When an error occurs during a request, an exception is raised.
-If the request is not authorized `OpenWeatherClient::AutheniticationError` is raied.
-When attributes like latitude or longitude are outside of the expected range a `RangeError` is raised.
+
+If the configured API version is not supported by the client, `OpenWeatherClient::APIVersionNotSupportedError` is raised.
+If the request is not authorized, `OpenWeatherClient::AutheniticationError` is raised.
+If attributes like latitude or longitude are outside of the expected range, `RangeError` is raised.
+If the time is longer in the past than one hour, `OpenWeatherClient::NotCurrentError` is raised.
 
 ### Secure Configuration
-In Rails provides the credentials functionality for [environmental security](https://edgeguides.rubyonrails.org/security.html#environmental-security). This mechanism can be used by OpenWeatherClient to load the API key from an encrypted file. This also allows easy separation of production and development channel configuration.
+Rails provides the credentials functionality for [environmental security](https://edgeguides.rubyonrails.org/security.html#environmental-security).
+This mechanism can be used by OpenWeatherClient to load the API key from an encrypted file.
+This also allows easy separation of production and development api key configuration.
+
 All settings are defined under the top-level entry `open_weather_client`.
 ```yaml
 # $ bin/rails credentials:edit
@@ -50,7 +69,7 @@ open_weather_client:
   appid: "<INSERT OPENWEATHERMAP API KEY HERE>"
 ```
 
-After configuration of the credentials you can load the settings in your initializer with `#load_from_rails_configuration`.
+After configuring the credentials, they can be loaded in the initializer with `#load_from_rails_configuration`.
 
 ```ruby
 # OpenWeatherClient initializer
diff --git a/bin/console b/bin/console
index 2f0b7e8..c5d9903 100755
--- a/bin/console
+++ b/bin/console
@@ -13,11 +13,10 @@ require 'open_weather_client'
 
 OpenWeatherClient.configure do |config|
   if File.exist?('config.yml')
-    # NOTE(Keune): The channels available in the console can be set in the file channels.yml. It contains a simple
-    # mapping of channel identifiers to webhook URLs. The channel identifier is loaded as a symbol.
+    # NOTE(Keune): The console automatically loads the appid from the config.yml file in the same directory
     #
     # Example: APPID: "<INSERT YOUR WEBHOOK URL HERE>"
-    puts 'Load channels specified by file'
+    puts 'Load appid specified by file'
 
     require 'yaml'
     settings = YAML.load_file 'config.yml'
diff --git a/lib/open_weather_client.rb b/lib/open_weather_client.rb
index b3ae765..7e15700 100644
--- a/lib/open_weather_client.rb
+++ b/lib/open_weather_client.rb
@@ -9,10 +9,13 @@
 ##
 # Get weather data from OpenWeatherMap
 module OpenWeatherClient
+  # The configured Open Weather API Version is not supported
+  class APIVersionNotSupportedError < StandardError; end
+
   # Error during authentication with the OpenWeatherMap servers
   class AuthenticationError < StandardError; end
 
-  # The rquested time is not current enough for getting weather data from the OpenWeatherMap server
+  # The requested time is not current enough for getting weather data from the OpenWeatherMap server
   class NotCurrentError < StandardError; end
 
   class << self
diff --git a/lib/open_weather_client/caching/memory.rb b/lib/open_weather_client/caching/memory.rb
index 084b599..e745d84 100644
--- a/lib/open_weather_client/caching/memory.rb
+++ b/lib/open_weather_client/caching/memory.rb
@@ -9,9 +9,9 @@ class Caching
     # When the limit is reached the least recently used entry is evicted.
     class Memory < OpenWeatherClient::Caching
       # Memory cache to store a hash of keys and request data
-      attr :memory_cache
+      attr_reader :memory_cache
       # Key registry of the memory cache. The first entry is the key of the least recently accessed data
-      attr :memory_keys
+      attr_reader :memory_keys
 
       ##
       # Initialize an empty cache
diff --git a/lib/open_weather_client/configuration.rb b/lib/open_weather_client/configuration.rb
index ab52ef1..e71566c 100644
--- a/lib/open_weather_client/configuration.rb
+++ b/lib/open_weather_client/configuration.rb
@@ -4,6 +4,8 @@ module OpenWeatherClient
   ##
   # Configuratin of OpenWeatherClient
   class Configuration
+    # [String] Used api version. One of :v25, :v30. Default :v25
+    attr_accessor :api_version
     # [String] API key to access OpenWeatherMap
     attr_accessor :appid
     # Caching method. One of :none, :memory
@@ -24,6 +26,7 @@ class Configuration
     ##
     # Initialize a new Configuration with the default settings
     def initialize
+      @api_version = :v25
       @caching = OpenWeatherClient::Caching.new
       @lang = 'de'
       @max_memory_entries = 10_000
diff --git a/lib/open_weather_client/request.rb b/lib/open_weather_client/request.rb
index 9bc1fa2..df7ac87 100644
--- a/lib/open_weather_client/request.rb
+++ b/lib/open_weather_client/request.rb
@@ -13,6 +13,7 @@ class Request
     # @param lon[Float] longitude of the requests location
     # @param time[Time] time of the request
     #
+    # @raise [APIVersionNotSupportedError] if the configured api version is not supported
     # @raise [AuthenticationError] if the request is not authorized, e.g in case the API key is not correct
     # @raise [NotCurrentError] if the requested time is older than 1 hour
     #
@@ -21,7 +22,7 @@ def self.get(lat:, lon:, time: Time.now)
       raise OpenWeatherClient::NotCurrentError if time < Time.now - 1 * 60 * 60
 
       begin
-        response = connection(lat, lon).get('2.5/weather')
+        response = connection(lat, lon).get(path)
         OpenWeatherClient.cache.store(lat: lat, lon: lon, data: response.body, time: time)
       rescue Faraday::UnauthorizedError
         raise OpenWeatherClient::AuthenticationError
@@ -54,5 +55,16 @@ def self.params(lat, lon)
         units: OpenWeatherClient.configuration.units
       }
     end
+
+    def self.path
+      case OpenWeatherClient.configuration.api_version
+      when :v25
+        '2.5/weather'
+      when :v30
+        '3.0/onecall'
+      else
+        raise OpenWeatherClient::APIVersionNotSupportedError
+      end
+    end
   end
 end
diff --git a/lib/open_weather_client/version.rb b/lib/open_weather_client/version.rb
index 38fb9aa..546c6d4 100644
--- a/lib/open_weather_client/version.rb
+++ b/lib/open_weather_client/version.rb
@@ -3,5 +3,5 @@
 module OpenWeatherClient
   ##
   # Version of OpenWeatherClient
-  VERSION = '0.1.6'
+  VERSION = '0.2.0'
 end
diff --git a/spec/open_weather_client/configuration_spec.rb b/spec/open_weather_client/configuration_spec.rb
index 25b8eeb..5aa10ff 100644
--- a/spec/open_weather_client/configuration_spec.rb
+++ b/spec/open_weather_client/configuration_spec.rb
@@ -20,6 +20,7 @@ def self.application
   subject { OpenWeatherClient.configuration }
 
   it 'has a default configuration' do
+    is_expected.to have_attributes(api_version: :v25)
     is_expected.to have_attributes(appid: nil)
     is_expected.to have_attributes(caching: OpenWeatherClient::Caching)
     is_expected.to have_attributes(units: 'metric')
diff --git a/spec/open_weather_client/request_spec.rb b/spec/open_weather_client/request_spec.rb
index e7b6739..c2ec444 100644
--- a/spec/open_weather_client/request_spec.rb
+++ b/spec/open_weather_client/request_spec.rb
@@ -3,21 +3,48 @@
 require 'open_weather_client/caching/memory'
 
 RSpec.describe OpenWeatherClient::Request do
-  describe 'current weather' do
+  let(:appid) { '1234567890' }
+  let(:lat) { 50.3569 }
+  let(:lon) { 7.5890 }
+
+  subject { OpenWeatherClient::Request.get(lat: lat, lon: lon) }
+
+  before :each do
+    OpenWeatherClient.configuration.appid = appid
+  end
+
+  context 'when One Call API 3.0' do
     before :each do
-      OpenWeatherClient.configuration.appid = '1234567890'
-      stub_request(:get, 'https://api.openweathermap.org/data/2.5/weather').with(query: hash_including(:appid, :lat, :lon, :lang, :units)).to_return(body: File.open('./spec/fixtures/weather/current.json'))
+      OpenWeatherClient.configuration.api_version = :v30
+      stub_request(:get, 'https://api.openweathermap.org/data/3.0/onecall').with(query: hash_including(:appid, :lat, :lon, :lang, :units)).to_return(body: File.open('./spec/fixtures/weather/current.json'))
+    end
+
+    it 'requests the current weather from correct endpoint' do
+      subject
+
+      expect(WebMock).to have_requested(:get, 'https://api.openweathermap.org/data/3.0/onecall').with query: { appid: appid, lat: lat, lon: lon, lang: OpenWeatherClient.configuration.lang, units: OpenWeatherClient.configuration.units }
     end
+  end
 
-    let(:lat) { 50.3569 }
-    let(:lon) { 7.5890 }
+  context 'when unsupported API version' do
+    before :each do
+      OpenWeatherClient.configuration.api_version = :v666
+    end
 
-    subject { OpenWeatherClient::Request.get(lat: lat, lon: lon) }
+    it 'raises not supported error' do
+      expect { subject }.to raise_error OpenWeatherClient::APIVersionNotSupportedError
+    end
+  end
+
+  describe 'current weather with default configuration' do
+    before :each do
+      stub_request(:get, 'https://api.openweathermap.org/data/2.5/weather').with(query: hash_including(:appid, :lat, :lon, :lang, :units)).to_return(body: File.open('./spec/fixtures/weather/current.json'))
+    end
 
     it 'requests the current weather' do
       subject
 
-      expect(WebMock).to have_requested(:get, 'https://api.openweathermap.org/data/2.5/weather').with query: { appid: OpenWeatherClient.configuration.appid, lat: lat, lon: lon, lang: OpenWeatherClient.configuration.lang, units: OpenWeatherClient.configuration.units }
+      expect(WebMock).to have_requested(:get, 'https://api.openweathermap.org/data/2.5/weather').with query: { appid: appid, lat: lat, lon: lon, lang: OpenWeatherClient.configuration.lang, units: OpenWeatherClient.configuration.units }
     end
 
     it 'has user agent' do