diff --git a/gnu/installer.scm b/gnu/installer.scm
index 0e40b81224..d9b71e2ca8 100644
--- a/gnu/installer.scm
+++ b/gnu/installer.scm
@@ -27,6 +27,8 @@
   #:use-module (guix utils)
   #:use-module (guix ui)
   #:use-module ((guix self) #:select (make-config.scm))
+  #:use-module (guix describe)
+  #:use-module (guix channels)
   #:use-module (guix packages)
   #:use-module (guix git-download)
   #:use-module (gnu installer utils)
@@ -52,6 +54,7 @@
   #:use-module (gnu system locale)
   #:use-module (ice-9 match)
   #:use-module (srfi srfi-1)
+  #:use-module (web uri)
   #:export (installer-program))
 
 (define module-to-import?
@@ -315,6 +318,25 @@ selected keymap."
              ((installer-final-page current-installer)
               result prev-steps))))))))
 
+(define (provenance-sexp)
+  "Return an sexp representing the currently-used channels, for logging
+purposes."
+  (match (match (current-channels)
+           (() (and=> (repository->guix-channel (dirname (current-filename)))
+                      list))
+           (channels channels))
+    (#f
+     (warning (G_ "cannot determine installer provenance~%"))
+     'unknown)
+    ((channels ...)
+     (map (lambda (channel)
+            (let* ((uri (string->uri (channel-url channel)))
+                   (url (if (or (not uri) (eq? 'file (uri-scheme uri)))
+                            "local checkout"
+                            (channel-url channel))))
+             `(channel ,(channel-name channel) ,url ,(channel-commit channel))))
+          channels))))
+
 (define (installer-program)
   "Return a file-like object that runs the given INSTALLER."
   (define init-gettext
@@ -429,6 +451,9 @@ selected keymap."
             (define current-installer newt-installer)
             (define steps (#$steps current-installer))
 
+            (installer-log-line "installer provenance: ~s"
+                                '#$(provenance-sexp))
+
             (dynamic-wind
               (installer-init current-installer)
               (lambda ()
diff --git a/gnu/packages/package-management.scm b/gnu/packages/package-management.scm
index d25e4b999c..b5b6b3875c 100644
--- a/gnu/packages/package-management.scm
+++ b/gnu/packages/package-management.scm
@@ -164,9 +164,9 @@
   ;; Latest version of Guix, which may or may not correspond to a release.
   ;; Note: the 'update-guix-package.scm' script expects this definition to
   ;; start precisely like this.
-  (let ((version "1.3.0")
-        (commit "682639c107908426fe6bf0a1b8404b98b7820290")
-        (revision 32))
+  (let ((version "1.4.0rc1")
+        (commit "020184fd39c6244e0336db3c608d3946b8d20490")
+        (revision 0))
     (package
       (name "guix")
 
@@ -182,7 +182,7 @@
                       (commit commit)))
                 (sha256
                  (base32
-                  "1ap8hfq46ncp7azhdvc9s64a9q9y74xfqpgfwlcgz6sw82a09yh0"))
+                  "1489fdxdb86shx6bnfs8kihhvw44xqiv6fkx3b67cyw1dakxh1m4"))
                 (file-name (string-append "guix-" version "-checkout"))))
       (build-system gnu-build-system)
       (arguments