diff --git a/.gitignore b/.gitignore
index c5f9935..1c26fa8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ Physics-5.tar.bz2
 /Physics-13.tar.bz2
 /Physics-17.tar.bz2
 /Physics-19.tar.bz2
+/Physics-21.tar.bz2
diff --git a/sources b/sources
index fcde78f..3a92441 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-97b6e805e51f3bae4b0c083a0f08c2a6  Physics-19.tar.bz2
+226593cc0a699f1a1821fdd8f08bfa4b  Physics-21.tar.bz2
diff --git a/sugar-physics.spec b/sugar-physics.spec
index 27d730c..9e58748 100644
--- a/sugar-physics.spec
+++ b/sugar-physics.spec
@@ -1,5 +1,5 @@
 Name:           sugar-physics
-Version:        19
+Version:        21
 Release:        1%{?dist}
 Summary:        A physical world simulator and playground for Sugar
 
@@ -44,6 +44,9 @@ chmod a-x $RPM_BUILD_ROOT%{sugaractivitydir}Physics.activity/activity/{activity.
 %{sugaractivitydir}/Physics.activity/
 
 %changelog
+* Wed May 28 2014 Peter Robinson <pbrobinson@fedoraproject.org> 21-1
+- Release 21
+
 * Sat Feb 15 2014 Peter Robinson <pbrobinson@fedoraproject.org> 19-1
 - Release 19