diff --git a/json_pure-1.8.1.gem b/json_pure-1.8.1.gem
deleted file mode 100644
index f23ca9a..0000000
Binary files a/json_pure-1.8.1.gem and /dev/null differ
diff --git a/json_pure-2.1.0.gem b/json_pure-2.1.0.gem
new file mode 100644
index 0000000..b88d759
Binary files /dev/null and b/json_pure-2.1.0.gem differ
diff --git a/ruby-json_pure.spec b/ruby-json_pure.spec
index 85e2a0a..eb77067 100644
--- a/ruby-json_pure.spec
+++ b/ruby-json_pure.spec
@@ -1,7 +1,7 @@
-%define gemdir %(ruby -rubygems -e'puts Gem.default_dir')
+%define gemdir %(ruby -rrubygems -e'puts Gem.default_dir')
 %define gemname %(echo %{name} | sed 's,^ruby-,,')
 Name:          ruby-json_pure
-Version:       1.8.1
+Version:       2.1.0
 Release:       1mamba
 Summary:       A JSON implementation in pure Ruby
 Group:         System/Libraries
@@ -13,8 +13,8 @@ Source:        http://rubygems.org/downloads/json_pure-%{version}.gem
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 ## AUTOBUILDREQ-END
-BuildRequires: ruby-devel
-Requires:      ruby
+BuildRequires: ruby-devel >= 2.5.1
+Requires:      ruby >= 2.5.1
 
 %description
 A JSON implementation in pure Ruby.
@@ -42,5 +42,8 @@ rm -f %{buildroot}%{gemdir}/gems/%{gemname}-%{version}/.gitignore
 %{gemdir}/specifications/%{gemname}-%{version}.gemspec
 
 %changelog
+* Wed Jul 18 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 2.1.0-1mamba
+- update to 2.1.0
+
 * Wed Dec 11 2013 Silvan Calarco <silvan.calarco@mambasoft.it> 1.8.1-1mamba
 - package created using the webbuild interface