diff --git a/srcpkgs/firefox/template b/srcpkgs/firefox/template
index f68046376f5..09a76b594dd 100644
--- a/srcpkgs/firefox/template
+++ b/srcpkgs/firefox/template
@@ -3,7 +3,7 @@
 # THIS PKG MUST BE SYNCHRONIZED WITH "srcpkgs/firefox-i18n".
 #
 pkgname=firefox
-version=66.0.4
+version=66.0.5
 revision=1
 build_helper="rust"
 short_desc="Mozilla Firefox web browser"
@@ -11,7 +11,7 @@ maintainer="Johannes <johannes.brechtmann@gmail.com>"
 license="MPL-2.0, GPL-2.0-or-later, LGPL-2.1-or-later"
 homepage="https://www.mozilla.org/firefox/"
 distfiles="${MOZILLA_SITE}/${pkgname}/releases/${version}/source/${pkgname}-${version}.source.tar.xz"
-checksum=7ac6fae17e402276483fbfbb6b320d61e6695a28f1112ba2c987127f105dc25d
+checksum=a2aeb4e036d1365a2d2550e24ba8b4dde061281300f2b11a204cc1e9eb1792b5
 
 lib32disabled=yes