diff --git a/smoldyn.spec b/smoldyn.spec
index a6f93c4..75ab63e 100644
--- a/smoldyn.spec
+++ b/smoldyn.spec
@@ -17,7 +17,7 @@
 Name:  smoldyn
 Summary: A particle-based spatial stochastic simulator
 Version: 2.61
-Release: 4%{?dist}
+Release: 5%{?dist}
 
 # The rxnparam.c and SurfaceParam.c source code files are in the public domain.
 #
@@ -187,6 +187,9 @@ popd
 %doc documentation/*
 
 %changelog
+* Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 2.61-5
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
+
 * Fri Jul 24 2020 Jeff Law <law@redhat.com> - 2.61-4
 - Use  __cmake_in_source_build