diff --git a/config.gemspec b/config.gemspec
index d59ced0c..104548af 100644
--- a/config.gemspec
+++ b/config.gemspec
@@ -37,9 +37,15 @@ Donate: \e[34mhttps://opencollective.com/rubyconfig/donate\e[0m\n"
 
   # Default RSpec run will test against latest Rails app
   unless ENV['APPRAISAL_INITIALIZED'] || ENV['GITHUB_ACTIONS']
-    gems_to_install = /gem "(.*?)", "(.*?)"(?!, platform: (?!\[:ruby\]))/
-    File.read(Dir['gemfiles/rails*.gemfile'].sort.last).scan(gems_to_install) do |name, version|
-      s.add_development_dependency name, version
+    gems_to_install = /gem "(.*?)", "(.*?)"(, platform: \:(.*))?/
+    File.read(Dir['gemfiles/rails*.gemfile'].sort.last).scan(gems_to_install) do |name, version, _, platform|
+      if platform.nil?
+        s.add_development_dependency name, version
+      else
+        if platform.to_s == RUBY_ENGINE
+          s.add_development_dependency name, version
+        end
+      end
     end
   end
 
diff --git a/lib/config.rb b/lib/config.rb
index 471b113d..24b24918 100644
--- a/lib/config.rb
+++ b/lib/config.rb
@@ -23,7 +23,8 @@ module Config
     merge_nil_values: true,
     overwrite_arrays: true,
     merge_hash_arrays: false,
-    validation_contract: nil
+    validation_contract: nil,
+    environment: nil
   )
 
   def self.setup
diff --git a/lib/config/integrations/rails/railtie.rb b/lib/config/integrations/rails/railtie.rb
index 460fa5f3..6748c116 100644
--- a/lib/config/integrations/rails/railtie.rb
+++ b/lib/config/integrations/rails/railtie.rb
@@ -9,7 +9,7 @@ def preload
 
           # Parse the settings before any of the initializers
           Config.load_and_set_settings(
-            Config.setting_files(::Rails.root.join('config'), ::Rails.env)
+            Config.setting_files(::Rails.root.join('config'), Config.environment.nil? ? ::Rails.env : Config.environment.to_sym)
           )
         end
 
diff --git a/lib/config/options.rb b/lib/config/options.rb
index b139a26c..4810ed00 100644
--- a/lib/config/options.rb
+++ b/lib/config/options.rb
@@ -38,13 +38,13 @@ def reload_env!
 
       ENV.each do |variable, value|
         separator = Config.env_separator
-        prefix = (Config.env_prefix || Config.const_name).to_s.split(separator)
+        prefix = (Config.env_prefix || Config.const_name).to_s
+        
+        new_keys = variable.to_s.split(separator)        
+        prefix_array = prefix.split(separator)
+        next if new_keys.shift(prefix_array.size) != prefix_array
 
-        keys = variable.to_s.split(separator)
-
-        next if keys.shift(prefix.size) != prefix
-
-        keys.map! { |key|
+        new_keys.map! { |key|
           case Config.env_converter
             when :downcase then
               key.downcase.to_sym
@@ -55,11 +55,17 @@ def reload_env!
           end
         }
 
-        leaf = keys[0...-1].inject(hash) { |h, key|
+        # split the environment variable name based on the keys we have in our config
+        transformed_keys = __lookup_keys(new_keys, separator)
+        if transformed_keys.length > 0
+          new_keys = transformed_keys
+        end
+        
+        leaf = new_keys[0...-1].inject(hash) { |h, key|
           h[key] ||= {}
         }
 
-        leaf[keys.last] = Config.env_parse_values ? __value(value) : value
+        leaf[new_keys.last] = Config.env_parse_values ? __value(value) : value
       end
 
       merge!(hash)
@@ -226,5 +232,48 @@ def __value(v)
         Integer(v) rescue Float(v) rescue v
       end
     end
+
+    def __lookup_keys(source_keys, separator, found_keys = [])
+      # if we've got no source keys, we must have got to the end of our search
+      return found_keys if source_keys.nil? || source_keys.length == 0
+
+      # To allow us to prefix keys with the same seperation character that exists in the config key, we need to search for the keys
+      lookup_key = nil
+      lookup_config = marshal_dump
+      # if we've passed in some found keys, we want to get the config keys from the appropriate level in our config
+      found_keys.each do |k|
+        lookup_config = lookup_config[k]
+      end
+
+      # we can find a config entry for the keys that have been found, so return what we have so they can be created
+      return found_keys if lookup_config.nil?
+
+      config_keys = lookup_config.keys
+
+      search_keys = source_keys.dup
+      (0..(search_keys.length - 1)).each do
+        lookup_key = config_keys.find{|k| k.to_sym == search_keys.join(separator).to_sym }
+        break if !lookup_key.nil?
+        
+        search_keys.pop
+      end
+        
+      found_keys ||= []
+      if !lookup_key.nil?
+        # we've found a key in our config that matches our env key, store this, and look inside this for the rest
+        found_keys << lookup_key
+        # get the new search keys
+        # do this by taking the original environment variable keys, and removing the key we've found in our config
+        env_key = source_keys.join(separator)
+        # replace "our_key_" first, then "our_key"
+        # leaving us with the remaining keys to search
+        env_key = env_key.gsub(lookup_key.to_s + separator, "").gsub(lookup_key.to_s, "") 
+        search_keys = env_key.split(separator)
+        
+        # call the same function again to get the next config key
+        found_keys = __lookup_keys(search_keys, separator, found_keys)
+      end
+      found_keys
+    end
   end
 end
diff --git a/lib/config/version.rb b/lib/config/version.rb
index c011340c..13c361d0 100644
--- a/lib/config/version.rb
+++ b/lib/config/version.rb
@@ -1,3 +1,3 @@
 module Config
-  VERSION = '2.2.1'.freeze
+  VERSION = '2.3.0'.freeze
 end
diff --git a/lib/generators/config/templates/config.rb b/lib/generators/config/templates/config.rb
index 7c82c5f8..426d3805 100644
--- a/lib/generators/config/templates/config.rb
+++ b/lib/generators/config/templates/config.rb
@@ -15,6 +15,10 @@
   #
   # config.overwrite_arrays = true
 
+  # Use a different method of determining the current environment
+  # defaults to ::Rails.env
+  # config.environment = ENV.fetch('ENVIRONMENT', :development)
+
   # Load environment variables from the `ENV` object and override any settings defined in files.
   #
   # config.use_env = false
diff --git a/spec/config_env_spec.rb b/spec/config_env_spec.rb
index 0906eec8..ad7626fd 100644
--- a/spec/config_env_spec.rb
+++ b/spec/config_env_spec.rb
@@ -178,6 +178,13 @@
 
         expect(config.key).to eq(nil)
       end
+
+      it 'should recognise a key name if it contains a character which is the same as the custom separator' do
+        ENV['MY_CONFIG_QUERY_SERVICE_API_KEY'] = "value"
+        expect(config.query_service.api_key).to eq('value')
+        expect(config.query).to be_nil
+        expect(config['query_service_api_key']).to be_nil        
+      end
     end
 
     context 'and variable names conversion' do
diff --git a/spec/fixtures/settings.yml b/spec/fixtures/settings.yml
index 2d04b728..67f14718 100644
--- a/spec/fixtures/settings.yml
+++ b/spec/fixtures/settings.yml
@@ -18,4 +18,7 @@ photo_sizes:
   avatar: [60, 60]
 root:
   yahoo.com: 2
-  'google.com': 3
+  "google.com": 3
+
+query_service:
+  api_key: "theapikey"
diff --git a/spec/options_spec.rb b/spec/options_spec.rb
index 0a94061c..18d0e5d7 100644
--- a/spec/options_spec.rb
+++ b/spec/options_spec.rb
@@ -218,7 +218,7 @@
         expect(config.array[1].b).to eq("two")
       end
     end
-
+    
   end
 
 end