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diff --git a/intl/update-icu.sh b/intl/update-icu.sh
new file mode 100755
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+#!/bin/sh
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+set -e
+
+# Update to an ICU release:
+#   Usage: update-icu.sh <URL of ICU GIT> <release tag name>
+#   E.g., for ICU 62.1: update-icu.sh https://github.com/unicode-org/icu.git release-62-1
+#
+# Update to an ICU maintenance branch:
+#   Usage: update-icu.sh <URL of ICU GIT> <maintenance name>
+#   E.g., for ICU 62.1: update-icu.sh https://github.com/unicode-org/icu.git maint/maint-62
+
+if [ $# -lt 2 ]; then
+  echo "Usage: update-icu.sh <URL of ICU GIT> <release tag name>"
+  exit 1
+fi
+
+# Ensure that $Date$ in the checked-out git files expands timezone-agnostically,
+# so that this script's behavior is consistent when run from any time zone.
+export TZ=UTC
+
+# Also ensure GIT-INFO is consistently English.
+export LANG=en_US.UTF-8
+export LANGUAGE=en_US
+export LC_ALL=en_US.UTF-8
+
+icu_dir=`dirname $0`/icu
+
+# Remove intl/icu/source, then replace it with a clean export.
+rm -rf ${icu_dir}/source
+tmpclonedir=$(mktemp -d)
+git clone --depth 1 --branch $2 $1 ${tmpclonedir}
+cp -r ${tmpclonedir}/icu4c/source ${icu_dir}/source
+
+# Record `git log`.
+# (This ensures that if ICU modifications are performed properly, it's always
+# possible to run the command at the top of this script and make no changes to
+# the tree.)
+git -C ${tmpclonedir} log -1 > ${icu_dir}/GIT-INFO
+
+# Clean up after ourselves.
+rm -rf ${tmpclonedir}
+
+# Remove layoutex, tests, and samples, but leave makefiles and test data in place.
+find ${icu_dir}/source/layoutex -name '*Makefile.in' -prune -or -type f -print | xargs rm
+find ${icu_dir}/source/test -name '*Makefile.in' -prune -or -name 'testdata' -prune -or -type f -print | xargs rm
+find ${icu_dir}/source/samples -name '*Makefile.in' -prune -or -type f -print | xargs rm
+
+for patch in \
+ bug-915735 \
+ suppress-warnings.diff \
+ bug-1198952-workaround-make-3.82-bug.diff \
+ bug-1614941-dsb-hsb-dates.diff \
+ bug-1636984-display-name-fractional-seconds.diff \
+ bug-1636984-append-item-dayperiod-fractional-seconds.diff \
+ bug-1706949-wasi-workaround.diff \
+ bug-1790071-ICU-22132-standardize-vtzone-output.diff \
+ bug-1838173-ICU-22412-start-time-iso8601.diff \
+ bug-1814862-ICU-22260.diff \
+ double-conversion.diff \
+ bug-1856428-ICU-22541.diff \
+ bug-1856290-ICU-20548-dateinterval-timezone.diff \
+ bug-1856291-ICU-22526-calendar-timezone-offset-limit.diff \
+; do
+  echo "Applying local patch $patch"
+  patch -d ${icu_dir}/../../ -p1 --no-backup-if-mismatch < ${icu_dir}/../icu-patches/$patch
+done
+
+topsrcdir=`dirname $0`/../
+python ${topsrcdir}/js/src/tests/non262/String/make-normalize-generateddata-input.py $topsrcdir
+
+# Update our moz.build files in config/external/icu, and build a new ICU data
+# file.
+python `dirname $0`/icu_sources_data.py $topsrcdir
+
+hg addremove "${icu_dir}/source" "${icu_dir}/GIT-INFO" ${topsrcdir}/config/external/icu
+
+# Check local tzdata version.
+`dirname $0`/update-tzdata.sh -c
+
+# CLDR updates may lead to new language tag mappings, so we need to call make_intl_data.py, too.
+echo "INFO: Please run 'js/src/builtin/intl/make_intl_data.py langtags' to update additional language tag files for SpiderMonkey."