diff --git a/README b/README
index 921565bb..15792d8c 100644
--- a/README
+++ b/README
@@ -1,5 +1,12 @@
 Welcome to mu & mu4e!
 
+*Note*: you are looking at the *development* branch, which is where new code is being developed and
+tested, and which may occasionally break.
+
+Distribution and non-adventurous users are instead recommended to use the [1.4.x Release
+Branch](https://github.com/djcb/mu/tree/release/1.4.x) or to pick up one of the [1.4.x
+releases](https://github.com/djcb/mu/releases).
+
 Given the enormous amounts of e-mail many people gather and the importance of e-mail message in our
 work-flows, it's essential to quickly deal with all that mail - in particular, to instantly find
 that one important e-mail you need right now, and quickly file away message for later use.
diff --git a/configure.ac b/configure.ac
index f68abe5e..af30784f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,7 @@
 ## Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
 AC_PREREQ([2.68])
-AC_INIT([mu],[1.4.7],[https://github.com/djcb/mu/issues],[mu])
+AC_INIT([mu],[1.5.1],[https://github.com/djcb/mu/issues],[mu])
 AC_COPYRIGHT([Copyright (C) 2008-2020 Dirk-Jan C. Binnema])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_SRCDIR([mu/mu.cc])