diff --git a/contrib/guix/libexec/prelude.bash b/contrib/guix/libexec/prelude.bash
index 9cc151c7067..428fc41e739 100644
--- a/contrib/guix/libexec/prelude.bash
+++ b/contrib/guix/libexec/prelude.bash
@@ -51,7 +51,7 @@ fi
 time-machine() {
     # shellcheck disable=SC2086
     guix time-machine --url=https://git.savannah.gnu.org/git/guix.git \
-                      --commit=7bf1d7aeaffba15c4f680f93ae88fbef25427252 \
+                      --commit=53396a22afc04536ddf75d8f82ad2eafa5082725 \
                       --cores="$JOBS" \
                       --keep-failed \
                       --fallback \
diff --git a/contrib/guix/manifest.scm b/contrib/guix/manifest.scm
index 94f350dd6dc..f7897cc9d23 100644
--- a/contrib/guix/manifest.scm
+++ b/contrib/guix/manifest.scm
@@ -91,17 +91,7 @@ chain for " target " development."))
       (home-page (package-home-page xgcc))
       (license (package-license xgcc)))))
 
-(define base-gcc
-  (package
-    (inherit gcc-12) ;; 12.3.0
-    (version "12.4.0")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append "mirror://gnu/gcc/gcc-"
-                                  version "/gcc-" version ".tar.xz"))
-              (sha256
-               (base32
-                "0xcida8l2wykvvzvpcrcn649gj0ijn64gwxbplacpg6c0hk6akvh"))))))
+(define base-gcc gcc-12) ;; 12.4.0
 
 (define base-linux-kernel-headers linux-libre-headers-6.1)