diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
index cff5a9b480..1722c7d290 100755
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -245,7 +245,7 @@ def check_MACHO_sdk(binary) -> bool:
     return False
 
 def check_MACHO_lld(binary) -> bool:
-    if binary.build_version.tools[0].version == [18, 1, 6]:
+    if binary.build_version.tools[0].version == [18, 1, 8]:
         return True
     return False
 
diff --git a/contrib/guix/libexec/prelude.bash b/contrib/guix/libexec/prelude.bash
index 80bfb2875f..5bc828625e 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=f0bb724211872cd6158fce6162e0b8c73efed126 \
+                      --commit=efc26826400762207cde9f23802cfe75a737963c \
                       --cores="$JOBS" \
                       --keep-failed \
                       --fallback \