diff --git a/build-aux/GNUmakefile.in b/build-aux/GNUmakefile.in
index 95e8be41..ac6ed678 100644
--- a/build-aux/GNUmakefile.in
+++ b/build-aux/GNUmakefile.in
@@ -310,8 +310,10 @@ $(TARBALL): .tarball-version | generate-ChangeLog
 ifdef GUIX
 update-hash: $(TARBALL)
 	$(GUIX) download file://$(PWD)/$<
-	sed -i -e 's,(base32 #!mes!# "[^"]*"),(base32 #!mes!# "$(shell $(GUIX) hash $<)"),' guix/git/mes.scm
-
+	sed -i 											\
+		-e 's,version #!mes!# "[^"]*"),version #!mes!# "$(VERSION)"),'			\
+		-e 's,(base32 #!mes!# "[^"]*"),(base32 #!mes!# "$(shell $(GUIX) hash $<)"),' 	\
+		guix/git/mes.scm
 else
 $(warning update-hash: no guix)
 endif
@@ -335,7 +337,10 @@ tag:
 guix-build:
 	./pre-inst-env $(GUIX) build mes@$(VERSION) --with-source=$(TARBALL)
 
-release: update-hash | gen-announce guix-build
+release: update-hash
+	git commit -m 'guix: mes: Update to $(VERSION).'			\
+	    -m '* guix/git/mes.scm (mes)[source]: Update to $(VERSION).'	\
+	    guix/git/mes.scm
 
 GPG_KEY_ID:=1A858392E331EAFDB8C27FFBF3C1A0D9C1D65273
 GEN_ANNOUNCE=$(GNULIB)/build-aux/announce-gen
diff --git a/guix/git/mes.scm b/guix/git/mes.scm
index 72b9436a..3571cc42 100644
--- a/guix/git/mes.scm
+++ b/guix/git/mes.scm
@@ -1,5 +1,5 @@
 ;;; GNU Mes --- Maxwell Equations of Software
-;;; Copyright © 2016,2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;; Copyright © 2016,2017,2018,2019,2020,2021 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Mes.
 ;;;
@@ -160,13 +160,13 @@ extensive examples, including parsers for the Javascript and C99 languages.")
 (define-public mes
   (package
     (name "mes")
-    (version "0.22")
+    (version #!mes!# "0.22")
     (source (origin
               (method url-fetch)
               (uri (string-append
                     "https://ftp.gnu.org/pub/gnu/mes/mes-" version ".tar.gz"))
               (sha256
-               (base32 #!mes!# "04pajp8v31na34ls4730ig5f6miiplhdvkmsb9ls1b8bbmw2vb4n"))))
+               (base32 #!mes!# "16ngnrdlzik19sdzy9d7krg57q6ws3xrckwkk2gs7q4h5f3x1z99"))))
     (build-system gnu-build-system)
     (supported-systems '("aarch64-linux" "armhf-linux" "i686-linux" "x86_64-linux"))
     (propagated-inputs
@@ -207,7 +207,7 @@ Guile.")
     (license gpl3+)))
 
 (define-public mes.git
- (let ((version "0.22")
+ (let ((version #!mes!# "0.22")
         (revision "0")
         (commit (read-string (open-pipe "git show HEAD | head -1 | cut -d ' ' -f 2" OPEN_READ))))
     (package