diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4adb16..0a68296 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,20 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning].
 
+## [Unreleased]
+
+### Changed
+
+- Changed the color scheme for Ruby files:
+
+  + Ruby booleans, 'nil', numbers and string delimitiers are using the `Normal`
+    syntax group.
+
+  + `rubySymbol` are relinked to `rubyConstant`.
+
+  + Some Ruby keywords are relinked to `Statement` to make the scheme more
+    coherent.
+
 ## [0.5.0] - 2019-09-17
 
 ### Added
@@ -203,6 +217,7 @@ project adheres to [Semantic Versioning].
 
   + Otherwise, a GUI version of Vim must be used.
 
+[Unreleased]: https://github.com/ludokng/vim-odyssey/compare/0.5.0...HEAD
 [0.5.0]: https://github.com/ludokng/vim-odyssey/compare/0.4.0...0.5.0
 [0.4.0]: https://github.com/ludokng/vim-odyssey/compare/0.3.0...0.4.0
 [0.3.0]: https://github.com/ludokng/vim-odyssey/compare/0.2.0...0.3.0
diff --git a/after/syntax/ruby.vim b/after/syntax/ruby.vim
new file mode 100644
index 0000000..96d3d9b
--- /dev/null
+++ b/after/syntax/ruby.vim
@@ -0,0 +1,26 @@
+"                                __              ____
+"                  _____ __  __ / /_   __  __   / __/____   _____
+"                 / ___// / / // __ \ / / / /  / /_ / __ \ / ___/
+"                / /   / /_/ // /_/ // /_/ /  / __// /_/ // /
+"               /_/    \__,_//_.___/ \__, /  /_/   \____//_/
+"                             __    /____/
+"                 ____   ____/ /__  __ _____ _____ ___   __  __
+"                / __ \ / __  // / / // ___// ___// _ \ / / / /
+"               / /_/ // /_/ // /_/ /(__  )(__  )/  __// /_/ /
+"               \____/ \__,_/ \__, //____//____/ \___/ \__, /
+"                            /____/                   /____/
+"
+" Note: This script only defines the syntax group named rubyOdysseyNil, because
+" otherwise nil is considered to be a rubyPseudoVariable
+"
+" Maintainer: Ludovic Koenig <ludovic.koenig@gmail.com>
+" Version: 0.6.0
+" Since: 0.6.0
+" License: MIT
+"
+" Ruby Syntax {{{
+
+syntax keyword rubyOdysseyNil nil
+
+" }}}
+" vim: foldmethod=marker
diff --git a/colors/odyssey.vim b/colors/odyssey.vim
index a4af003..a052354 100644
--- a/colors/odyssey.vim
+++ b/colors/odyssey.vim
@@ -314,19 +314,30 @@ let g:python_no_builtin_highlight = 1
 " }}}
 " Ruby Highlights {{{
 
-call s:l(                 'rubyClass',  'Statement')
-call s:h(         'rubyClassVariable', 'background',  'warning', 'italic')
-call s:l(                'rubyDefine',  'Statement')
-call s:l(               'rubyInclude',  'Statement')
-call s:h(      'rubyInstanceVariable', 'background',  'warning', 'italic')
-call s:l('rubyInterpolationDelimiter',   'Function')
-call s:l(       'rubyStringDelimiter',   'Constant')
+call s:l(                 'rubyClass',    'Statement')
+call s:h(         'rubyClassVariable',   'background', 'warning', 'italic')
+call s:l(                'rubyDefine',    'Statement')
+call s:l(               'rubyInclude',    'Statement')
+call s:h(      'rubyInstanceVariable',   'background', 'warning', 'italic')
+call s:l('rubyInterpolationDelimiter',     'Function')
+call s:l(       'rubyStringDelimiter',       'Normal')
+call s:l(                'rubyAccess',    'Statement')
+call s:l(             'rubyAttribute',    'Statement')
+call s:l(        'rubyPseudoVariable',      'Special')
+call s:l(                'rubySymbol', 'rubyConstant')
+call s:h(        'rubyBlockParameter',   'background', 'procedure', 'italic')
+call s:l(            'rubyOdysseyNil',       'Normal')
+call s:l(               'rubyBoolean',       'Normal')
+call s:l(                 'rubyFloat',       'Normal')
+call s:l(               'rubyInteger',       'Normal')
 
 " }}}
 " Rust Highlights {{{
+
 call s:l(       'rustLifetime', 'Constant')
 call s:l(   'rustQuestionMark', 'Operator')
 call s:l('rustOdysseyFunction', 'Function')
 call s:l(    'rustOdysseyType',     'Type')
+
 " }}}
 " vim: foldmethod=marker