diff --git a/gjs.spec b/gjs.spec
index 3a632b0..e1519dc 100644
--- a/gjs.spec
+++ b/gjs.spec
@@ -1,11 +1,11 @@
 %global glib2_version 2.58.0
 %global gobject_introspection_version 1.61.2
 %global gtk3_version 3.20
-%global mozjs78_version 78.4.0-1
+%global mozjs78_version 78.5.0-1
 
 Name:          gjs
 Version:       1.66.1
-Release:       3%{?dist}
+Release:       4%{?dist}
 Summary:       Javascript Bindings for GNOME
 
 # The following files contain code from Mozilla which
@@ -95,6 +95,9 @@ the functionality of the installed gjs package.
 %{_datadir}/installed-tests/
 
 %changelog
+* Wed Nov 18 2020 Frantisek Zatloukal <fzatlouk@redhat.com> - 1.66.1-4
+- Rebuild against mozjs78-78.5.0-1
+
 * Sat Oct 31 2020 Jeff Law <law@redhat.com> - 1.66.1-3
 - Fix bogus volatiles caught by gcc-11