diff --git a/kross-interpreters.spec b/kross-interpreters.spec
index 7db0afb..a108871 100644
--- a/kross-interpreters.spec
+++ b/kross-interpreters.spec
@@ -2,7 +2,7 @@
 %define javarootdir %_jvmdir/jdk/
 
 Name:          kross-interpreters
-Version:       20.12.3
+Version:       21.04.0
 Release:       1mamba
 Summary:       Kross interpreters
 Group:         Graphical Desktop/Applications/Development
@@ -20,6 +20,7 @@ BuildRequires: libgcc
 BuildRequires: libkross-devel
 BuildRequires: libpython27-devel
 BuildRequires: libqt5-devel
+BuildRequires: libruby-devel
 BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
 BuildRequires: cmake
@@ -110,6 +111,9 @@ Ruby plugin for the Kross architecture in KDE5.
 %{_qt5_plugindir}/krossruby.so
 
 %changelog
+* Thu Apr 22 2021 Automatic Build System <autodist@mambasoft.it> 21.04.0-1mamba
+- automatic version update by autodist
+
 * Fri Mar 05 2021 Automatic Build System <autodist@mambasoft.it> 20.12.3-1mamba
 - automatic version update by autodist