diff --git a/alexandria.spec b/alexandria.spec
index 4b6256d..00f4d53 100644
--- a/alexandria.spec
+++ b/alexandria.spec
@@ -2,7 +2,7 @@
 %undefine		minorver	
 %undefine		ifpre	
 
-%define		fedorarel	1
+%define		fedorarel	2
 %define		rel		%{?ifpre:0.}%{fedorarel}%{?minorver:.%minorver}
 
 
@@ -89,6 +89,9 @@ BuildRequires:	gettext
 BuildRequires:	intltool
 # From 0.7.4
 BuildRequires:	rubygem(rspec)
+# Needed since Ruby 3.0.
+# https://github.com/mvz/alexandria-book-collection-manager/issues/124
+BuildRequires:	rubygem(rexml)
 
 # Amazon AWS v3 -> v4 switch
 # AWS v4 is supported by alexandria itself
@@ -126,6 +129,9 @@ Requires:	rubygem(gstreamer)
 Requires:	rubygem(gtk3)
 # Uses syck (bug 922217)
 Requires:	rubygem(syck)
+# Needed since Ruby 3.0.
+# https://github.com/mvz/alexandria-book-collection-manager/issues/124
+Requires:	rubygem(rexml)
 
 Requires(pre):		GConf2
 Requires(post):		GConf2
@@ -283,6 +289,9 @@ EOF
 %{_datadir}/icons/hicolor/*/apps/%{name}.*
 
 %changelog
+* Thu Jan  7 2021 Vít Ondruch <vondruch@redhat.com> - 0.7.8-2
+- Add ReXML dependency needed for Ruby 3.0.
+
 * Thu Dec  3 2020 Mamoru TASAKA <mtasaka@fedoraproject.org> - 0.7.8-1
 - 0.7.8