diff --git a/build/update-locales.sh b/build/update-locales.sh
index b7611c0c9a7..596ddfec032 100755
--- a/build/update-locales.sh
+++ b/build/update-locales.sh
@@ -1,13 +1,14 @@
-#!/bin/bash
+#!/bin/sh
 
-set -e
+# this script runs in alpine image which only has `sh` shell
 
-SED=sed
-
-if [[ $OSTYPE == 'darwin'* ]]; then
-  # for macOS developers, use "brew install gnu-sed"
-  SED=gsed
+set +e
+if sed --version 2>/dev/null | grep -q GNU; then
+  SED_INPLACE="sed -i"
+else
+  SED_INPLACE="sed -i ''"
 fi
+set -e
 
 if [ ! -f ./options/locale/locale_en-US.ini ]; then
   echo "please run this script in the root directory of the project"
@@ -32,7 +33,7 @@ mv ./options/locale/locale_en-US.ini ./options/
 # * remove the trailing quote
 # * unescape the quotes
 # * eg: key="...\"..." => key=..."...
-$SED -i -r -e '/^[-.A-Za-z0-9_]+[ ]*=[ ]*".*"$/ {
+$SED_INPLACE -r -e '/^[-.A-Za-z0-9_]+[ ]*=[ ]*".*"$/ {
 	s/^([-.A-Za-z0-9_]+)[ ]*=[ ]*"/\1=/
 	s/"$//
 	s/\\"/"/g
@@ -41,8 +42,8 @@ $SED -i -r -e '/^[-.A-Za-z0-9_]+[ ]*=[ ]*".*"$/ {
 # * if the escaped line is incomplete like `key="...` or `key=..."`, quote it with backticks
 # * eg: key="... => key=`"...`
 # * eg: key=..." => key=`..."`
-$SED -i -r -e 's/^([-.A-Za-z0-9_]+)[ ]*=[ ]*(".*[^"])$/\1=`\2`/' ./options/locale/*.ini
-$SED -i -r -e 's/^([-.A-Za-z0-9_]+)[ ]*=[ ]*([^"].*")$/\1=`\2`/' ./options/locale/*.ini
+$SED_INPLACE -r -e 's/^([-.A-Za-z0-9_]+)[ ]*=[ ]*(".*[^"])$/\1=`\2`/' ./options/locale/*.ini
+$SED_INPLACE -r -e 's/^([-.A-Za-z0-9_]+)[ ]*=[ ]*([^"].*")$/\1=`\2`/' ./options/locale/*.ini
 
 # Remove translation under 25% of en_us
 baselines=$(wc -l "./options/locale_en-US.ini" | cut -d" " -f1)