diff --git a/tachyon.spec b/tachyon.spec
index 7e932eb..adb0f6f 100644
--- a/tachyon.spec
+++ b/tachyon.spec
@@ -10,7 +10,7 @@
 Summary: Parallel / Multiprocessor Ray Tracing System
 Name: tachyon
 Version: 0.99
-Release: 0.12.%{beta}%{?dist}
+Release: 0.13.%{beta}%{?dist}
 URL: http://jedi.ks.uiuc.edu/~johns/raytracer/
 Group: Applications/Engineering
 Source0: http://jedi.ks.uiuc.edu/~johns/raytracer/files/%{version}%{beta}/%{name}-%{version}%{beta}.tar.gz
@@ -137,6 +137,9 @@ install -pm644 src/{hash,tachyon{,_dep},util}.h $RPM_BUILD_ROOT%{_includedir}/ta
 %{_datadir}/tachyon
 
 %changelog
+* Fri Jun 19 2015 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 0.99-0.13.b6
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild
+
 * Mon Aug 18 2014 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 0.99-0.12.b6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_21_22_Mass_Rebuild