diff --git a/gnuradio.spec b/gnuradio.spec
index 0b7ecfb..7e01064 100644
--- a/gnuradio.spec
+++ b/gnuradio.spec
@@ -22,7 +22,7 @@
 
 Name:		gnuradio
 Version:	3.9.1.0
-Release:	1%{?alphatag:.%{alphatag}}%{?dist}
+Release:	2%{?alphatag:.%{alphatag}}%{?dist}
 Summary:	Software defined radio framework
 
 License:	GPLv3
@@ -193,6 +193,9 @@ rm -r %{buildroot}%{_datadir}/%{name}/grc/freedesktop
 %{_datadir}/gnuradio/examples
 
 %changelog
+* Mon May 10 2021 Jonathan Wakely <jwakely@redhat.com> - 3.9.1.0-2
+- Rebuilt for removed libstdc++ symbols (#1937698)
+
 * Tue Mar 23 2021 Jaroslav Škarvada <jskarvad@redhat.com> - 3.9.1.0-1
 - New version
   Resolves: rhbz#1941867