diff --git a/ruby-progressbar.spec b/ruby-progressbar.spec
index d376697..2061478 100644
--- a/ruby-progressbar.spec
+++ b/ruby-progressbar.spec
@@ -1,6 +1,6 @@
 Name:          ruby-progressbar
 Version:       0.9
-Release:       2mamba
+Release:       3mamba
 Summary:       A Text Progress Bar Library for Ruby
 Group:         System/Internationalization
 Vendor:        openmamba
@@ -9,8 +9,8 @@ Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           http://namazu.org/~satoru/ruby-progressbar/
 Source:        http://0xcc.net/ruby-progressbar/ruby-progressbar-%{version}.tar.gz
 License:       GPL
-Requires:	ruby
-BuildRequires:	ruby
+Requires:	   ruby >= 2.5.1
+BuildRequires: ruby >= 2.5.1
 ## AUTOBUILDREQ-BEGIN
 ## AUTOBUILDREQ-END
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
@@ -43,6 +43,9 @@ cp progressbar.rb %{buildroot}%{ruby_sitelib}
 #progressbar.en.rd progressbar.ja.rd test.rb
 
 %changelog
+* Wed Jul 18 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 0.9-3mamba
+- rebuilt for ruby 2.5.1
+
 * Sun Sep 01 2013 Automatic Build System <autodist@mambasoft.it> 0.9-2mamba
 - automatic rebuild by autodist