diff --git a/scripts/create-release-branch.sh b/scripts/create-release-branch.sh
index 65b0f72..e1ad4ac 100755
--- a/scripts/create-release-branch.sh
+++ b/scripts/create-release-branch.sh
@@ -39,12 +39,7 @@ function main() {
 	check_current_branch
 
 	create_branch ${BRANCH}
-	update_changelog ${VERSION}
-	update_package_version ${VERSION}
-	update_dependencies_version
-	regenerate_package_lock
-	build_package
-	commit_changes ${VERSION}
+	./scripts/prepare-release.sh ${VERSION}
 	finish ${VERSION} ${BRANCH} ${TAG}
 }
 
@@ -52,19 +47,19 @@ function usage() {
 	local COMMAND=`basename ${0}`
 
 	echo -e "${COLOR_SECTION}NAME${COLOR_RESET}
-	${COMMAND} - Prepare for new release
+	${COMMAND} - Create a branch and prepare for new release
 
 ${COLOR_SECTION}SYNOPSIS${COLOR_RESET}
 	${COLOR_COMMAND_NAME}${COMMAND}${COLOR_RESET} <${COLOR_OPTION}new-version${COLOR_RESET}>
 
 ${COLOR_SECTION}DESCRIPTION${COLOR_RESET}
-	This command will...
-	- create a new branch for release
-	- update ${COLOR_FILE}CHANGELOG.md${COLOR_RESET}
-	- update package version in ${COLOR_FILE}package.json${COLOR_RESET}
-	- update dependencies version in ${COLOR_FILE}package.json${COLOR_RESET}
-	- verify
-	- ...and commit!
+	This command:
+	- creates a new branch for release
+	- updates ${COLOR_FILE}CHANGELOG.md${COLOR_RESET}
+	- updates package version in ${COLOR_FILE}package.json${COLOR_RESET}
+	- updates dependencies version in ${COLOR_FILE}package.json${COLOR_RESET}
+	- verifies
+	- ...and commits!
 
 	${COLOR_OPTION}new-version${COLOR_RESET} must follow \"Semantic Versioning\" <https://semver.org/>.
 "
@@ -99,49 +94,6 @@ function create_branch() {
 	git checkout -b ${BRANCH} ${BASE_BRANCH}
 }
 
-function update_changelog() {
-	local VERSION=$1
-	local DATE=`date "+%Y-%m-%d"`
-	local KEYWORD="Unreleased"
-
-	sed -i".bak" -r \
-		-e "s/^((##\s+)\[${KEYWORD}\])$/\1\n\n\2[${VERSION}] - ${DATE}/" \
-		-e "s/^(\[${KEYWORD}\](.*))(v.*)\.\.\.HEAD$/\1v${VERSION}...HEAD\n[${VERSION}]\2\3...v${VERSION}/" \
-		CHANGELOG.md
-}
-
-function update_package_version() {
-	local VERSION=$1
-
-	sed -i".bak" -r \
-		-e "s/(\"version\"\s*:\s*)\".*?\"/\1\"${VERSION}\"/" \
-		package.json
-}
-
-function update_dependencies_version() {
-	npm ci
-	npm run check-updates -- -u
-}
-
-function regenerate_package_lock() {
-	rm -rf package-lock.json node_modules
-	npm install
-}
-
-function build_package() {
-	npm run build
-	npm run verify
-}
-
-function commit_changes() {
-	local VERSION=$1
-
-	rm -rf node_modules
-	npm ci --only=production
-	git add CHANGELOG.md package.json package-lock.json node_modules lib
-	git commit -m "version ${VERSION}"
-}
-
 function finish() {
 	local VERSION=$1
 	local BRANCH=$2
diff --git a/scripts/prepare-release.sh b/scripts/prepare-release.sh
new file mode 100755
index 0000000..a549057
--- /dev/null
+++ b/scripts/prepare-release.sh
@@ -0,0 +1,112 @@
+#!/bin/bash
+# requires following packages:
+# - git; I believe it's already installed.
+# - sed; GNU sed is preferred. POSIX sed may not work.
+
+set -e
+
+COLOR_ERROR="\e[1;41m"
+COLOR_SECTION="\e[1;34m"
+COLOR_COMMAND_NAME="\e[1;34m"
+COLOR_OPTION="\e[4;36m"
+COLOR_COMMAND="\e[4m"
+COLOR_FILE="\e[1;34m"
+COLOR_BRANCH="\e[1;31m"
+COLOR_INPUT="\e[1;31m"
+COLOR_SELECT="\e[1;32m"
+COLOR_RESET="\e[m"
+
+function main() {
+	if [ $# -lt 1 ]; then
+		usage
+	fi
+
+	cd $(dirname ${0})/..
+
+	local VERSION=$1
+	check_version_format ${VERSION}
+
+	update_changelog ${VERSION}
+	update_package_version ${VERSION}
+	update_dependencies_version
+	regenerate_package_lock
+	build_package
+	commit_changes ${VERSION}
+}
+
+function usage() {
+	local COMMAND=`basename ${0}`
+
+	echo -e "${COLOR_SECTION}NAME${COLOR_RESET}
+	${COMMAND} - Prepare for new release
+
+${COLOR_SECTION}SYNOPSIS${COLOR_RESET}
+	${COLOR_COMMAND_NAME}${COMMAND}${COLOR_RESET} <${COLOR_OPTION}new-version${COLOR_RESET}>
+
+${COLOR_SECTION}DESCRIPTION${COLOR_RESET}
+	This command:
+	- updates ${COLOR_FILE}CHANGELOG.md${COLOR_RESET}
+	- updates package version in ${COLOR_FILE}package.json${COLOR_RESET}
+	- updates dependencies version in ${COLOR_FILE}package.json${COLOR_RESET}
+	- verifies
+	- ...and commits!
+
+	${COLOR_OPTION}new-version${COLOR_RESET} must follow \"Semantic Versioning\" <https://semver.org/>.
+"
+	exit 1
+}
+
+function check_version_format() {
+	if [[ $1 =~ ^[0-9]+\.[0-9]+\.[0-9]+ ]]; then
+		return
+	fi
+
+	echo -e "${COLOR_ERROR}ERROR:${COLOR_RESET} Follow \"Semantic Versioning\" <https://semver.org/> for new version.
+" >&2
+	exit 2
+}
+
+function update_changelog() {
+	local VERSION=$1
+	local DATE=`date "+%Y-%m-%d"`
+	local KEYWORD="Unreleased"
+
+	sed -i".bak" -r \
+		-e "s/^((##\s+)\[${KEYWORD}\])$/\1\n\n\2[${VERSION}] - ${DATE}/" \
+		-e "s/^(\[${KEYWORD}\](.*))(v.*)\.\.\.HEAD$/\1v${VERSION}...HEAD\n[${VERSION}]\2\3...v${VERSION}/" \
+		CHANGELOG.md
+}
+
+function update_package_version() {
+	local VERSION=$1
+
+	sed -i".bak" -r \
+		-e "s/(\"version\"\s*:\s*)\".*?\"/\1\"${VERSION}\"/" \
+		package.json
+}
+
+function update_dependencies_version() {
+	npm ci
+	npm run check-updates -- -u
+}
+
+function regenerate_package_lock() {
+	rm -rf package-lock.json node_modules
+	npm install
+}
+
+function build_package() {
+	npm run build
+	npm run verify
+}
+
+function commit_changes() {
+	local VERSION=$1
+
+	rm -rf node_modules
+	npm ci --only=production
+	git add CHANGELOG.md package.json package-lock.json node_modules lib
+	git commit -m "version ${VERSION}"
+}
+
+main "$@"