diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8290ee8c..57b3e2ef 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,6 +13,7 @@ jobs:
     env:
       COVERAGE_RUBY_VERSION: 2.6
       BUNDLE_PATH: vendor/bundle
+      RAILS_MASTER_KEY: 0e29551e5c31acf7c769d64397af54e4 # rails require to decrypt creds
     strategy:
       fail-fast: false
       matrix:
diff --git a/README.md b/README.md
index 2cdc34c0..c5ae18f4 100644
--- a/README.md
+++ b/README.md
@@ -274,6 +274,7 @@ After installing `Config` in Rails, you will find automatically generated file t
 * `evaluate_erb_in_yaml` - evaluate ERB in YAML config files. Set to false if the config file contains ERB that should not be evaluated at load time. Default: `true`
 * `file_name` - name of the file to store general keys accessible in all environments. Default: `'settings'` - located at `config/settings.yml`
 * `dir_name` - name of the directory to store environment-specific files. Default: `'settings'` - located at `config/settings/`
+* `use_rails_credentials` - evaluate Rails credentials if loaded with `RAILS_MASTER_KEY` or `config/master.key`. Can be access using `Settings.secret.secret_key_base`. Rails crendetials will override other settings as it will loaded last.
 
 ### Merge customization
 
diff --git a/lib/config.rb b/lib/config.rb
index e98d1e70..addaf2e2 100644
--- a/lib/config.rb
+++ b/lib/config.rb
@@ -29,6 +29,7 @@ module Config
     merge_hash_arrays: false,
     validation_contract: nil,
     evaluate_erb_in_yaml: true,
+    use_rails_credentials: false,
     environment: nil
   )
 
@@ -47,6 +48,15 @@ def self.load_files(*sources)
       config.add_source!(source)
     end
 
+    # load rails crendentials
+    if defined?(::Rails::Railtie) && Config.use_rails_credentials
+      if Rails.application.credentials.respond_to?(:credentials)
+        config.add_source!(Sources::HashSource.new(Rails.application.credentials.config.deep_stringify_keys))
+      else
+        config.add_source!(Sources::HashSource.new(Rails.application.secrets.to_h.deep_stringify_keys))
+      end
+    end
+
     config.add_source!(Sources::EnvSource.new(ENV)) if Config.use_env
 
     config.load!
diff --git a/spec/app/rails_5.2/config/credentials.yml.enc b/spec/app/rails_5.2/config/credentials.yml.enc
index cafb6057..c5b1ebec 100644
--- a/spec/app/rails_5.2/config/credentials.yml.enc
+++ b/spec/app/rails_5.2/config/credentials.yml.enc
@@ -1 +1 @@
-A2UDbxJDfWG0plzucsHjLA6QIqFzAoXntTM6UZzmqRRWwXT+rQJQEOgIOqeOdW9aNe8AhJJvc4tEMtw3DZ2LSKQ2O06MRhbBbpQRU8UDhEeUUvadNXN7xYW3qS10UINn0kIDUdzAwYxYpo4Ux+p6pvcRcV2+pimvoLoKIcwqsPxGSyVhAuymqn29WMS6JddRNj8LXshYnceVtEtw25Pzc+J5POXQRnF9CCrRV/XWrqtF5qROIMQepiIxizIkwSQA2+qFIL3oOlLBTyPf6I3ybGk/wlTqVnZNRoKI6GP6iJ0uTTKFYIBXSHUjTS/oC91f4xFOWgSvIojcavmeTWKxobaGur8LqUL9/cJ3rirhHyMdCJuVQr+m5ySUyto8Z25/1IdPsRyleGl/k23kXjzwJmzChdq9mElsXJSE--hgxYDA7y8hacPoA2--Rxd34YfrAzf1jlxy3b/FGA==
\ No newline at end of file
+eeAQ/OXwC0m/AFe89iINCTXiXfUjEJT0hjQsUdyyR1vH0Z7PxXuMiceL1zms6vjCex9kUIL6PBnaB0QZhWOn9DOEmXF67+1nzvJ5SCTuk33fHouECBHxcRbiIqL2/DtLWq+E49mPdJFL85qZPqfQbNhvVeH7E/kjOFU700KENA1+XDMnmoGRW1ePbDhKSNvsPHRZAX6I4ZirJlYvN9IcN29CTLoYPtcm8J1DAtpTZIlJ+XLgOeJJC606I6WMKcz4wgGl9u7+4q/poP63aUnWgpcagn2MGrVz7GnOdkYIGnapvcr56FesEU8pNjTPrtlCdwU8--hQYbWSSJlVbedEFS--NRIGzBPS6ZyZWUO/8clKpg==
\ No newline at end of file
diff --git a/spec/app/rails_5.2/config/environments/test.rb b/spec/app/rails_5.2/config/environments/test.rb
index 0a38fd3c..4a22f9f8 100644
--- a/spec/app/rails_5.2/config/environments/test.rb
+++ b/spec/app/rails_5.2/config/environments/test.rb
@@ -12,6 +12,8 @@
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
+  config.require_master_key = true
+
   # Configure public file server for tests with Cache-Control for performance.
   config.public_file_server.enabled = true
   config.public_file_server.headers = {
diff --git a/spec/app/rails_5.2/config/master.key b/spec/app/rails_5.2/config/master.key
new file mode 100644
index 00000000..b9093596
--- /dev/null
+++ b/spec/app/rails_5.2/config/master.key
@@ -0,0 +1 @@
+0e29551e5c31acf7c769d64397af54e4
diff --git a/spec/app/rails_6.0/config/credentials.yml.enc b/spec/app/rails_6.0/config/credentials.yml.enc
index 05b8ae3b..c5b1ebec 100644
--- a/spec/app/rails_6.0/config/credentials.yml.enc
+++ b/spec/app/rails_6.0/config/credentials.yml.enc
@@ -1 +1 @@
-PaXkA1XvCoD2qMPBVqHDcwGTtDN1gPdMjTkQlR8ULG97mJGnwirXG3zYhSmSE/gUsGgpPNOSIVJzVr8ZhvO1EVR6UMCIVMf0oE1kCtES0gD5JA4wi0jrrE7v0zA0lmIheJRvwb/DSGPKayviZn0md9AdfQyneHOGwDF/PrxkSrs6S/YPz/444dex3GUlKUuBduyGzxTEPs+v8if7CP4pK1qSxt2AM+7lDnr4mFp6lpmfIgeloqF/M0opyVnwnZtzGWzm7rOTntyKBeIN0FlXgRMVhQcZy3PstILHqGMygT+xCD0ZDLQnWziMYmkWaJlNdJvoI6mS2OEONqICDv3C3KT5gdQ6Fe8fgtxFzkR6evOJKJ0a5IX/QEjcNBNj/1+uPyWrk+NauQt4m3c9KIFFmyqZLVU/5NEJPS/d--DP0Q5D3FxFw7oxNZ--/ERbqGg48aYyZeYVnk5STw==
\ No newline at end of file
+eeAQ/OXwC0m/AFe89iINCTXiXfUjEJT0hjQsUdyyR1vH0Z7PxXuMiceL1zms6vjCex9kUIL6PBnaB0QZhWOn9DOEmXF67+1nzvJ5SCTuk33fHouECBHxcRbiIqL2/DtLWq+E49mPdJFL85qZPqfQbNhvVeH7E/kjOFU700KENA1+XDMnmoGRW1ePbDhKSNvsPHRZAX6I4ZirJlYvN9IcN29CTLoYPtcm8J1DAtpTZIlJ+XLgOeJJC606I6WMKcz4wgGl9u7+4q/poP63aUnWgpcagn2MGrVz7GnOdkYIGnapvcr56FesEU8pNjTPrtlCdwU8--hQYbWSSJlVbedEFS--NRIGzBPS6ZyZWUO/8clKpg==
\ No newline at end of file
diff --git a/spec/app/rails_6.0/config/credentials/test.key b/spec/app/rails_6.0/config/credentials/test.key
new file mode 100644
index 00000000..b9093596
--- /dev/null
+++ b/spec/app/rails_6.0/config/credentials/test.key
@@ -0,0 +1 @@
+0e29551e5c31acf7c769d64397af54e4
diff --git a/spec/app/rails_6.0/config/credentials/test.yml.enc b/spec/app/rails_6.0/config/credentials/test.yml.enc
new file mode 100644
index 00000000..c5b1ebec
--- /dev/null
+++ b/spec/app/rails_6.0/config/credentials/test.yml.enc
@@ -0,0 +1 @@
+eeAQ/OXwC0m/AFe89iINCTXiXfUjEJT0hjQsUdyyR1vH0Z7PxXuMiceL1zms6vjCex9kUIL6PBnaB0QZhWOn9DOEmXF67+1nzvJ5SCTuk33fHouECBHxcRbiIqL2/DtLWq+E49mPdJFL85qZPqfQbNhvVeH7E/kjOFU700KENA1+XDMnmoGRW1ePbDhKSNvsPHRZAX6I4ZirJlYvN9IcN29CTLoYPtcm8J1DAtpTZIlJ+XLgOeJJC606I6WMKcz4wgGl9u7+4q/poP63aUnWgpcagn2MGrVz7GnOdkYIGnapvcr56FesEU8pNjTPrtlCdwU8--hQYbWSSJlVbedEFS--NRIGzBPS6ZyZWUO/8clKpg==
\ No newline at end of file
diff --git a/spec/app/rails_6.0/config/environments/test.rb b/spec/app/rails_6.0/config/environments/test.rb
index 06aef36d..7c068b63 100644
--- a/spec/app/rails_6.0/config/environments/test.rb
+++ b/spec/app/rails_6.0/config/environments/test.rb
@@ -13,6 +13,8 @@
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
+  config.require_master_key = true
+
   # Configure public file server for tests with Cache-Control for performance.
   config.public_file_server.enabled = true
   config.public_file_server.headers = {
diff --git a/spec/app/rails_6.1/config/credentials.yml.enc b/spec/app/rails_6.1/config/credentials.yml.enc
index b5435d4b..c5b1ebec 100644
--- a/spec/app/rails_6.1/config/credentials.yml.enc
+++ b/spec/app/rails_6.1/config/credentials.yml.enc
@@ -1 +1 @@
-jzup5kRgbmiI0F89h0xPvPGGpYC1FQsTvFQQBj0sED/K0rltK+3pv8E2YonXPgHdd8qkKdqKfhm91SlEt/y/vBvcdgklocYFVTlEJpggaPjxkXjIoyYc8/55EAOSt35rWBwyKoINvUYa0X/xlKzp/G0Q9PWmdmnum5+rwA/adEL49qLKofAQoum0XRzj5sIyNfmhJ0nQ+N3LEsGKQZ5nkvD6nCI5ZBQVcyrXpVngzLSXzabNEY7ecMDdMnI9wx+qUxh48f0uro1vHOAmf6uQ+OY3gEX6ctIEKuGEMVaIql5WIxwYXII1GgeKbl8coyKs54Llo/yaMen25NFM3HN8LHZySGa3mH7k3XR9wQVOC2DO00ntgUtpxiszQcEu/mouZnaVBPSVL3EcD45wxBOf88/7SMDxy7cmUoLP--s+KOPMDaTNvlD2T2--Q48zotFsOULqsWoCRU2fDg==
\ No newline at end of file
+eeAQ/OXwC0m/AFe89iINCTXiXfUjEJT0hjQsUdyyR1vH0Z7PxXuMiceL1zms6vjCex9kUIL6PBnaB0QZhWOn9DOEmXF67+1nzvJ5SCTuk33fHouECBHxcRbiIqL2/DtLWq+E49mPdJFL85qZPqfQbNhvVeH7E/kjOFU700KENA1+XDMnmoGRW1ePbDhKSNvsPHRZAX6I4ZirJlYvN9IcN29CTLoYPtcm8J1DAtpTZIlJ+XLgOeJJC606I6WMKcz4wgGl9u7+4q/poP63aUnWgpcagn2MGrVz7GnOdkYIGnapvcr56FesEU8pNjTPrtlCdwU8--hQYbWSSJlVbedEFS--NRIGzBPS6ZyZWUO/8clKpg==
\ No newline at end of file
diff --git a/spec/app/rails_6.1/config/credentials/test.key b/spec/app/rails_6.1/config/credentials/test.key
new file mode 100644
index 00000000..b9093596
--- /dev/null
+++ b/spec/app/rails_6.1/config/credentials/test.key
@@ -0,0 +1 @@
+0e29551e5c31acf7c769d64397af54e4
diff --git a/spec/app/rails_6.1/config/credentials/test.yml.enc b/spec/app/rails_6.1/config/credentials/test.yml.enc
new file mode 100644
index 00000000..c5b1ebec
--- /dev/null
+++ b/spec/app/rails_6.1/config/credentials/test.yml.enc
@@ -0,0 +1 @@
+eeAQ/OXwC0m/AFe89iINCTXiXfUjEJT0hjQsUdyyR1vH0Z7PxXuMiceL1zms6vjCex9kUIL6PBnaB0QZhWOn9DOEmXF67+1nzvJ5SCTuk33fHouECBHxcRbiIqL2/DtLWq+E49mPdJFL85qZPqfQbNhvVeH7E/kjOFU700KENA1+XDMnmoGRW1ePbDhKSNvsPHRZAX6I4ZirJlYvN9IcN29CTLoYPtcm8J1DAtpTZIlJ+XLgOeJJC606I6WMKcz4wgGl9u7+4q/poP63aUnWgpcagn2MGrVz7GnOdkYIGnapvcr56FesEU8pNjTPrtlCdwU8--hQYbWSSJlVbedEFS--NRIGzBPS6ZyZWUO/8clKpg==
\ No newline at end of file
diff --git a/spec/app/rails_6.1/config/environments/test.rb b/spec/app/rails_6.1/config/environments/test.rb
index 06ead80c..c15f965c 100644
--- a/spec/app/rails_6.1/config/environments/test.rb
+++ b/spec/app/rails_6.1/config/environments/test.rb
@@ -16,6 +16,8 @@
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
+  config.require_master_key = true
+
   # Configure public file server for tests with Cache-Control for performance.
   config.public_file_server.enabled = true
   config.public_file_server.headers = {
diff --git a/spec/app/rails_7.0/config/credentials/test.yml.enc b/spec/app/rails_7.0/config/credentials/test.yml.enc
new file mode 100644
index 00000000..c5b1ebec
--- /dev/null
+++ b/spec/app/rails_7.0/config/credentials/test.yml.enc
@@ -0,0 +1 @@
+eeAQ/OXwC0m/AFe89iINCTXiXfUjEJT0hjQsUdyyR1vH0Z7PxXuMiceL1zms6vjCex9kUIL6PBnaB0QZhWOn9DOEmXF67+1nzvJ5SCTuk33fHouECBHxcRbiIqL2/DtLWq+E49mPdJFL85qZPqfQbNhvVeH7E/kjOFU700KENA1+XDMnmoGRW1ePbDhKSNvsPHRZAX6I4ZirJlYvN9IcN29CTLoYPtcm8J1DAtpTZIlJ+XLgOeJJC606I6WMKcz4wgGl9u7+4q/poP63aUnWgpcagn2MGrVz7GnOdkYIGnapvcr56FesEU8pNjTPrtlCdwU8--hQYbWSSJlVbedEFS--NRIGzBPS6ZyZWUO/8clKpg==
\ No newline at end of file
diff --git a/spec/app/rails_7.1/.gitignore b/spec/app/rails_7.1/.gitignore
index 5fb66c9f..947e9a99 100644
--- a/spec/app/rails_7.1/.gitignore
+++ b/spec/app/rails_7.1/.gitignore
@@ -33,3 +33,5 @@
 
 # Ignore master key for decrypting credentials and more.
 /config/master.key
+
+/config/credentials/test.key
diff --git a/spec/app/rails_7.1/config/credentials/test.yml.enc b/spec/app/rails_7.1/config/credentials/test.yml.enc
new file mode 100644
index 00000000..c5b1ebec
--- /dev/null
+++ b/spec/app/rails_7.1/config/credentials/test.yml.enc
@@ -0,0 +1 @@
+eeAQ/OXwC0m/AFe89iINCTXiXfUjEJT0hjQsUdyyR1vH0Z7PxXuMiceL1zms6vjCex9kUIL6PBnaB0QZhWOn9DOEmXF67+1nzvJ5SCTuk33fHouECBHxcRbiIqL2/DtLWq+E49mPdJFL85qZPqfQbNhvVeH7E/kjOFU700KENA1+XDMnmoGRW1ePbDhKSNvsPHRZAX6I4ZirJlYvN9IcN29CTLoYPtcm8J1DAtpTZIlJ+XLgOeJJC606I6WMKcz4wgGl9u7+4q/poP63aUnWgpcagn2MGrVz7GnOdkYIGnapvcr56FesEU8pNjTPrtlCdwU8--hQYbWSSJlVbedEFS--NRIGzBPS6ZyZWUO/8clKpg==
\ No newline at end of file
diff --git a/spec/config_spec.rb b/spec/config_spec.rb
index 505c6081..3f59f9bb 100644
--- a/spec/config_spec.rb
+++ b/spec/config_spec.rb
@@ -480,5 +480,46 @@
       end
 
     end
+
+    context 'rails credentials' do
+      if defined?(::Rails)
+        let(:config) do
+          files = ["#{fixture_path}/development.yml"]
+          Config.use_rails_credentials = true
+          Config.load_files(files)
+        end
+    
+        it "should have secret_key_base loaded" do
+          expect(config.keys).to contain_exactly(:size, :section, :aws, :secret_key_base)
+          expect(config.aws.secret_access_key).to eq('123456')
+        end
+        
+        context 'use_rails_credentials is false' do
+          let(:config) do
+            files = ["#{fixture_path}/development.yml"]
+            Config.use_rails_credentials = false
+            Config.load_files(files)
+          end
+
+          it "should not have secret_key_base loaded" do
+            expect(config.keys).to contain_exactly(:size, :section)
+          end
+        end
+      end
+      
+      unless defined?(::Rails)
+        context 'when not using rails' do
+          let(:config) do
+            files = ["#{fixture_path}/development.yml"]
+            Config.use_rails_credentials = true
+            Config.load_files(files)
+          end
+
+          it 'should not have secret_key_base loaded' do
+            expect(config.keys).to contain_exactly(:size, :section)
+          end
+        end
+      end
+    end
   end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ca0739e7..9740fce5 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -78,15 +78,16 @@ def fixture_path
 
       # Extend Config module with ability to reset configuration to the default values
       def self.reset
-        self.const_name           = 'Settings'
-        self.use_env              = false
-        self.knockout_prefix      = nil
-        self.overwrite_arrays     = true
-        self.schema               = nil
-        self.validation_contract  = nil
-        self.fail_on_missing      = false
-        self.file_name            = 'settings'
-        self.dir_name             = 'settings'
+        self.const_name             = 'Settings'
+        self.use_env                = false
+        self.knockout_prefix        = nil
+        self.overwrite_arrays       = true
+        self.schema                 = nil
+        self.validation_contract    = nil
+        self.fail_on_missing        = false
+        self.use_rails_credentials  = false
+        self.file_name              = 'settings'
+        self.dir_name               = 'settings'
         instance_variable_set(:@_ran_once, false)
       end
     end