diff --git a/step.spec b/step.spec
index 48f7c75..19bf30b 100644
--- a/step.spec
+++ b/step.spec
@@ -1,5 +1,5 @@
 Name:          step
-Version:       20.12.3
+Version:       21.04.0
 Release:       1mamba
 Summary:       Interactive Physical Simulator
 Group:         Graphical Desktop/Applications/Educational
@@ -10,41 +10,30 @@ URL:           https://www.kde.org/applications/education/step
 Source:        http://download.kde.org/stable/release-service/%{version}/src/step-%{version}.tar.xz
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
-BuildRequires: cln-devel
 BuildRequires: glibc-devel
 BuildRequires: libattica5-devel
 BuildRequires: libgcc
 BuildRequires: libgsl-devel
 BuildRequires: libkauth-devel
-BuildRequires: libkbookmarks-devel
 BuildRequires: libkcodecs-devel
 BuildRequires: libkcompletion-devel
 BuildRequires: libkconfig-devel
 BuildRequires: libkconfigwidgets-devel
 BuildRequires: libkcoreaddons-devel
 BuildRequires: libkcrash-devel
-BuildRequires: libkdelibs4support-devel
-BuildRequires: libkguiaddons-devel
-BuildRequires: libkhtml-devel
 BuildRequires: libki18n-devel
 BuildRequires: libkiconthemes-devel
 BuildRequires: libkio-devel
-BuildRequires: libkitemviews-devel
 BuildRequires: libkjobwidgets-devel
-BuildRequires: libkjs-devel
 BuildRequires: libknewstuff-devel
-BuildRequires: libknotifications-devel
-BuildRequires: libkparts-devel
 BuildRequires: libkplotting-devel
 BuildRequires: libkservice-devel
 BuildRequires: libktextwidgets-devel
-BuildRequires: libkunitconversion-devel
 BuildRequires: libkwidgetsaddons-devel
 BuildRequires: libkwindowsystem-devel
 BuildRequires: libkxmlgui-devel
 BuildRequires: libqalculate-devel
 BuildRequires: libqt5-devel
-BuildRequires: libsolid-devel
 BuildRequires: libsonnet-devel
 BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
@@ -131,6 +120,9 @@ exit 0
 #ChangeLog README TODO
 
 %changelog
+* Fri Apr 23 2021 Automatic Build System <autodist@mambasoft.it> 21.04.0-1mamba
+- automatic version update by autodist
+
 * Sat Mar 06 2021 Automatic Build System <autodist@mambasoft.it> 20.12.3-1mamba
 - automatic version update by autodist