diff --git a/lib/open_weather/connection.rb b/lib/open_weather/connection.rb
index aba20a4..74965bc 100644
--- a/lib/open_weather/connection.rb
+++ b/lib/open_weather/connection.rb
@@ -19,7 +19,7 @@ def connection
 
         options[:headers]['User-Agent'] = user_agent if user_agent
         options[:proxy] = proxy if proxy
-        options[:ssl] = { ca_path:, ca_file: } if ca_path || ca_file
+        options[:ssl] = { ca_path: ca_path, ca_file: ca_file } if ca_path || ca_file
 
         request_options = {}
         request_options[:timeout] = timeout if timeout
diff --git a/lib/open_weather/endpoints/current.rb b/lib/open_weather/endpoints/current.rb
index d09f75d..cebb705 100644
--- a/lib/open_weather/endpoints/current.rb
+++ b/lib/open_weather/endpoints/current.rb
@@ -4,22 +4,22 @@ module OpenWeather
   module Endpoints
     module Current
       def current_zip(code, country = nil, options = {})
-        options = code.is_a?(Hash) ? options.merge(code) : options.merge(zip: code, country:)
+        options = code.is_a?(Hash) ? options.merge(code) : options.merge(zip: code, country: country)
         current_weather(options)
       end
 
       def current_geo(lat, lon = nil, options = {})
-        options = lat.is_a?(Hash) ? options.merge(lat) : options.merge(lat:, lon:)
+        options = lat.is_a?(Hash) ? options.merge(lat) : options.merge(lat: lat, lon: lon)
         current_weather(options)
       end
 
       def current_city(name, state = nil, country = nil, options = {})
-        options = name.is_a?(Hash) ? options.merge(name) : options.merge(city: name, state:, country:)
+        options = name.is_a?(Hash) ? options.merge(name) : options.merge(city: name, state: state, country: country)
         current_weather(options)
       end
 
       def current_city_id(id, options = {})
-        options = id.is_a?(Hash) ? options.merge(id) : options.merge(id:)
+        options = id.is_a?(Hash) ? options.merge(id) : options.merge(id: id)
         current_weather(options)
       end
 
diff --git a/lib/open_weather/endpoints/hourly.rb b/lib/open_weather/endpoints/hourly.rb
index 3bf2cef..8ab9463 100644
--- a/lib/open_weather/endpoints/hourly.rb
+++ b/lib/open_weather/endpoints/hourly.rb
@@ -6,9 +6,9 @@ module Hourly
       def hourly(lat, lon = nil, options = {})
         # default to the pro endpoint if not specified
         endpoint = options.delete(:endpoint) || pro_endpoint
-        options = options.merge(endpoint:)
+        options = options.merge(endpoint: endpoint)
 
-        options = lat.is_a?(Hash) ? options.merge(lat) : options.merge(lat:, lon:)
+        options = lat.is_a?(Hash) ? options.merge(lat) : options.merge(lat: lat, lon: lon)
         OpenWeather::Models::Forecast::Hourly.new(get('2.5/forecast/hourly', options), options)
       end
     end
diff --git a/lib/open_weather/endpoints/one_call.rb b/lib/open_weather/endpoints/one_call.rb
index 8310932..38c793a 100644
--- a/lib/open_weather/endpoints/one_call.rb
+++ b/lib/open_weather/endpoints/one_call.rb
@@ -4,7 +4,7 @@ module OpenWeather
   module Endpoints
     module OneCall
       def one_call(lat, lon = nil, options = {})
-        options = lat.is_a?(Hash) ? options.merge(lat) : options.merge(lat:, lon:)
+        options = lat.is_a?(Hash) ? options.merge(lat) : options.merge(lat: lat, lon: lon)
         options[:exclude] = options[:exclude].join(',') if options[:exclude].is_a?(Array)
         options[:dt] = options[:dt].to_i if options[:dt].is_a?(Time)
         path = options.key?(:dt) ? '3.0/onecall/timemachine' : '3.0/onecall'
diff --git a/lib/open_weather/raise_error.rb b/lib/open_weather/raise_error.rb
index 5dbcba0..6677953 100644
--- a/lib/open_weather/raise_error.rb
+++ b/lib/open_weather/raise_error.rb
@@ -10,7 +10,7 @@ def on_complete(env)
         when 407
           # mimic the behavior that we get with proxy requests with HTTPS
           raise Faraday::ConnectionFailed, %(407 "Proxy Authentication Required ")
-        when (400...600)
+        when (400...600).freeze
           raise OpenWeather::Errors::Fault, response_values(env)
         end
       end
diff --git a/spec/lib/open_weather/models/station_spec.rb b/spec/lib/open_weather/models/station_spec.rb
index d013f25..a4f78fc 100644
--- a/spec/lib/open_weather/models/station_spec.rb
+++ b/spec/lib/open_weather/models/station_spec.rb
@@ -60,7 +60,7 @@
         .with(id)
         .and_call_original
 
-      model = OpenWeather::Models::Station.new(id:)
+      model = OpenWeather::Models::Station.new(id: id)
       result = model.delete!
       expect(result).to be_nil
     end