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diff --git a/intl/update-icu4x.sh b/intl/update-icu4x.sh
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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 the icu4x binary data for a given release:
+#   Usage: update-icu4x.sh <URL of ICU GIT> <release tag name>
+#   update-icu4x.sh https://github.com/unicode-org/icu4x.git icu@0.3.0
+#
+# Update to the main branch:
+#   Usage: update-icu4x.sh <URL of ICU GIT> <branch>
+#   update-icu4x.sh https://github.com/unicode-org/icu4x.git main
+
+if [ $# -lt 2 ]; then
+  echo "Usage: update-icu4x.sh <URL of ICU4X GIT> <release tag name> <CLDR version>"
+  echo "Example: update-icu4x.sh https://github.com/unicode-org/icu4x.git icu@0.3.0 39.0.0"
+  exit 1
+fi
+
+# Make a log function so the output is easy to read.
+log() {
+  CYAN='\033[0;36m'
+  CLEAR='\033[0m'
+  printf "${CYAN}[update-icu4x]${CLEAR} $*\n"
+}
+
+# Specify locale and time zone information for consistent output and reproduceability.
+export TZ=UTC
+export LANG=en_US.UTF-8
+export LANGUAGE=en_US
+export LC_ALL=en_US.UTF-8
+
+# Define all of the paths.
+original_pwd=$(pwd)
+top_src_dir=$(cd -- "$(dirname "$0")/.." >/dev/null 2>&1 ; pwd -P)
+data_dir=${top_src_dir}/config/external/icu4x
+data_file=${data_dir}/icu4x.postcard
+git_info_file=${data_dir}/ICU4X-GIT-INFO
+
+log "Remove the old data"
+rm -f ${data_file}
+
+log "Clone ICU4X"
+tmpclonedir=$(mktemp -d)
+git clone --depth 1 --branch $2 $1 ${tmpclonedir}
+
+log "Change the directory to the cloned repo"
+log ${tmpclonedir}
+cd ${tmpclonedir}
+
+log "Run the icu4x-datagen tool to regenerate the data."
+log "Saving the data to: ${data_file}"
+
+# TODO(Bug 1741262) - Should locales be filtered as well? It doesn't appear that the existing ICU
+# data builder is using any locale filtering.
+
+# TODO(Bug 1741264) - Keys are not supported yet: https://github.com/unicode-org/icu4x/issues/192
+# --keys <KEYS>...
+#     Include this resource key in the output. Accepts multiple arguments.
+# --key-file <KEY_FILE>
+#     Path to text file with resource keys to include, one per line. Empty lines and
+#     lines starting with '#' are ignored.
+cargo run --bin icu4x-datagen -- \
+  --cldr-tag $3                  \
+  --all-keys                     \
+  --all-locales                  \
+  --format blob                  \
+  --out ${data_file}             \
+  -v                             \
+
+log "Record the current cloned git information to:"
+log ${git_info_file}
+# (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 > ${git_info_file}
+
+log "Clean up the tmp directory"
+cd ${original_pwd}
+rm -rf ${tmpclonedir}