diff --git a/tools/release.sh b/tools/release.sh
index 762cae7..d812b67 100755
--- a/tools/release.sh
+++ b/tools/release.sh
@@ -140,37 +140,6 @@ resume_config() {
   mv _config.yml.bak _config.yml
 }
 
-# auto-generate a new version number to the file 'package.json'
-standard_version() {
-  if $opt_pre; then
-    standard-version --prerelease rc
-  else
-    standard-version
-  fi
-}
-
-# Prevent changelogs generated on master branch from having duplicate content
-# (the another bug of `standard-version`)
-standard_version_plus() {
-  temp_branch="prod-mirror"
-  temp_dir="$(mktemp -d)"
-
-  git checkout -b "$temp_branch" "$PROD_BRANCH"
-  git merge --no-ff --no-edit "$STAGING_BRANCH"
-
-  standard_version
-
-  cp package.json CHANGELOG.md "$temp_dir"
-
-  git checkout "$STAGING_BRANCH"
-  git reset --hard HEAD # undo the changes from $temp_branch
-  mv "$temp_dir"/* .    # rewrite the changelog
-
-  # clean up the temp stuff
-  rm -rf "$temp_dir"
-  git branch -D "$temp_branch"
-}
-
 # build a gem package
 build_gem() {
   echo -e "Build the gem package for v$_version\n"
@@ -184,13 +153,13 @@ build_gem() {
 release() {
   _version="$1" # X.Y.Z
 
-  git checkout "$PROD_BRANCH"
-  git merge --no-ff --no-edit "$working_branch"
-
-  # Create a new tag on production branch
+  # Create a new tag on working branch
   echo -e "Create tag v$_version\n"
   git tag "v$_version"
 
+  git checkout "$PROD_BRANCH"
+  git merge --no-ff --no-edit "$working_branch"
+
   # merge from patch branch to the staging branch
   # NOTE: This may break due to merge conflicts, so it may need to be resolved manually.
   if [[ $working_branch == hotfix/* ]]; then
@@ -203,15 +172,13 @@ release() {
 main() {
   check
 
-  if [[ "$working_branch" == "$STAGING_BRANCH" ]]; then
-    standard_version_plus
+  # auto-generate a new version number to the file 'package.json'
+  if $opt_pre; then
+    standard-version --prerelease rc
   else
-    standard_version
+    standard-version
   fi
 
-  # Change heading of Patch version to level 2 (a bug from `standard-version`)
-  sed -i "s/^### \[/## \[/g" CHANGELOG.md
-
   _version="$(grep '"version":' package.json | sed 's/.*: "//;s/".*//')"
 
   echo -e "Bump version number to $_version\n"