diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index b7349576beb..48b74468f84 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -4265,7 +4265,7 @@ It is a replacement for the @command{urlview} program.")
 (define-public mumi
   (package
     (name "mumi")
-    (version "0.12.0")
+    (version "0.13.0")
     (source (origin
               (method git-fetch)
               (uri (git-reference
@@ -4274,7 +4274,7 @@ It is a replacement for the @command{urlview} program.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "0p8xylwibfaiqy3321j7l6i3700lavjgw9rjjk1nwjb5fi0mmiqb"))))
+                "04mcd1xkdpvxlvpf4k4mvnwi06sdy8vy1di6gxxsr9msgdb366ir"))))
     (build-system gnu-build-system)
     (arguments
      (list