diff --git a/bootstrap b/bootstrap
index fbbf76f..fef3cbc 100755
--- a/bootstrap
+++ b/bootstrap
@@ -37,7 +37,7 @@ medir=`dirname "$me"`
 
 # A library of shell functions for autopull.sh, autogen.sh, and bootstrap.
 
-scriptlibversion=2025-01-26.03; # UTC
+scriptlibversion=2025-02-16.12; # UTC
 
 # Copyright (C) 2003-2025 Free Software Foundation, Inc.
 #
@@ -580,17 +580,11 @@ prepare_GNULIB_SRCDIR ()
           || cleanup_gnulib
         else
           # GNULIB_REFDIR is not set or not usable. Ignore it.
-          shallow=
+          shallow='--depth 2'
           if test -z "$GNULIB_REVISION"; then
-            if git clone -h 2>&1 | grep -- --depth > /dev/null; then
-              shallow='--depth 2'
-            fi
             git clone $shallow "$gnulib_url" "$gnulib_path" \
               || cleanup_gnulib
           else
-            if git fetch -h 2>&1 | grep -- --depth > /dev/null; then
-              shallow='--depth 2'
-            fi
             # Only want a shallow checkout of $GNULIB_REVISION, but git does not
             # support cloning by commit hash. So attempt a shallow fetch by
             # commit hash to minimize the amount of data downloaded and changes
@@ -601,7 +595,10 @@ prepare_GNULIB_SRCDIR ()
             # to fetching all commits.
             # $GNULIB_REVISION can be a commit id, a tag name, or a branch name.
             mkdir -p "$gnulib_path"
-            git -C "$gnulib_path" init
+            # Use a -c option to silence an annoying message
+            # "hint: Using 'master' as the name for the initial branch."
+            # (cf. <https://stackoverflow.com/questions/65524512/>).
+            git -C "$gnulib_path" -c init.defaultBranch=master init
             git -C "$gnulib_path" remote add origin "$gnulib_url"
             if git -C "$gnulib_path" fetch $shallow origin "$GNULIB_REVISION"
             then
diff --git a/gnulib b/gnulib
index 553ab92..3773db6 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 553ab924d2b68d930fae5d3c6396502a57852d23
+Subproject commit 3773db653242ab7165cd300295c27405e4f9cc79