diff --git a/rubygem-glu.spec b/rubygem-glu.spec
index e07f6bd..81e9da9 100644
--- a/rubygem-glu.spec
+++ b/rubygem-glu.spec
@@ -1,10 +1,10 @@
 %global	gem_name	glu
 
-%global	need_bootstrap	1
+%global	need_bootstrap	0
 
 Name:		rubygem-%{gem_name}
 Version:	8.3.0
-Release:	19%{?dist}
+Release:	20%{?dist}
 
 Summary:	Glu bindings for the opengl gem
 License:	MIT
@@ -100,6 +100,9 @@ popd
 %doc	%{gem_docdir}
 
 %changelog
+* Thu Jan 27 2022 Mamoru TASAKA <mtasaka@fedoraproject.org> - 8.3.0-20
+- F-36: rebuild against ruby31
+
 * Fri Jan 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 8.3.0-19
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild