diff --git a/srcpkgs/mu/template b/srcpkgs/mu/template
index 6ed5ee3ad4..1581d0d0d1 100644
--- a/srcpkgs/mu/template
+++ b/srcpkgs/mu/template
@@ -1,6 +1,6 @@
 # Template file for 'mu'
 pkgname=mu
-version=1.2
+version=1.3.1
 revision=1
 build_style=gnu-configure
 hostmakedepends="automake libtool pkg-config emacs texinfo"
@@ -10,10 +10,10 @@ maintainer="Benjamin Slade <slade@jnanam.net>"
 license="GPL-3.0-or-later"
 homepage="http://www.djcbsoftware.nl/code/mu/"
 distfiles="https://github.com/djcb/mu/archive/${version}.tar.gz"
-checksum=75ac379ddbaa35ab54035b057bf729537afbef09c71505c2f7209826265e049a
+checksum=7cd08df329321c8f85c1cd894508c616d0f5f066c0352417abd5c3756310455c
 
 pre_configure() {
-	sed -i 's,-I${prefix}/include,,' contrib/Makefile.am
+	vsed -i 's,-I${prefix}/include,,' contrib/Makefile.am
 	autoreconf -fi
 }