diff --git a/step.spec b/step.spec
index 1df4127..834bc02 100644
--- a/step.spec
+++ b/step.spec
@@ -1,5 +1,5 @@
 Name:          step
-Version:       21.04.2
+Version:       21.04.3
 Release:       1mamba
 Summary:       Interactive Physical Simulator
 Group:         Graphical Desktop/Applications/Educational
@@ -34,6 +34,7 @@ BuildRequires: libkwindowsystem-devel
 BuildRequires: libkxmlgui-devel
 BuildRequires: libqalculate-devel
 BuildRequires: libqt5-devel
+BuildRequires: libsolid-devel
 BuildRequires: libsonnet-devel
 BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
@@ -120,6 +121,9 @@ exit 0
 #ChangeLog README TODO
 
 %changelog
+* Fri Jul 09 2021 Automatic Build System <autodist@mambasoft.it> 21.04.3-1mamba
+- automatic version update by autodist
+
 * Fri Jun 11 2021 Automatic Build System <autodist@mambasoft.it> 21.04.2-1mamba
 - automatic version update by autodist