diff --git a/.update.sh b/.update.sh
index 47c09fa..0a6566b 100644
--- a/.update.sh
+++ b/.update.sh
@@ -3,15 +3,10 @@
 THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
 THIS_FILE=$(basename "${BASH_SOURCE}")
 source "$THIS_DIR/tools/common.sh"
-DFS_ENABLE_RET=${DFS_ENABLE_RET:-0}
 
-# get the specified commit id
-DFS_COMMIT=$(curl -fsSL https://api.beardic.cn/get-var/dfs-commit-id)
-if [[ ${#DFS_COMMIT} != 40 ]]; then
-    fmt_error "invalid commit id"
-    post_log "ERROR" "$THIS_FILE" "invalid commit id: ${DFS_COMMIT}"
-    exit
-fi
+DFS_UPDATED_RET=${DFS_UPDATED_RET:-0}
+DFS_UPDATE_CHANNEL=${DFS_UPDATE_CHANNEL:-"main"}
+
 # fetch origin
 cd $DOTFILES
 git fetch --all
@@ -20,6 +15,19 @@ if [[ -n "$(git status -s)" ]]; then
     post_log "ERROR" "$THIS_FILE" "directory not clean"
     exit
 fi
+
+# get the specified commit id
+case $DFS_UPDATE_CHANNEL in
+    "main" ) DFS_COMMIT=$(curl -fsSL https://api.beardic.cn/get-var/dfs-commit-id) ;;
+    "latest" ) DFS_COMMIT=$(git for-each-ref --sort=-committerdate refs/heads refs/remotes --format='%(objectname)' | head -n 1) ;;
+    * ) fmt_fatal "invalid update channel: $DFS_UPDATE_CHANNEL" ;;
+esac
+if [[ ${#DFS_COMMIT} != 40 ]]; then
+    fmt_error "invalid commit id"
+    post_log "ERROR" "$THIS_FILE" "invalid commit id: ${DFS_COMMIT}"
+    exit
+fi
+
 # update
 if [[ "$(git rev-parse HEAD)" == "$DFS_COMMIT" ]]; then
     fmt_info "nothing to do"
@@ -29,7 +37,7 @@ else
     if [[ -z "$DFS_DEV" ]]; then
         post_log "INFO" "$THIS_FILE" "will check out to commit $DFS_COMMIT"
         git -c advice.detachedHead=false checkout $DFS_COMMIT
-        cp ./.update.sh ./update.sh && chmod +x ./update.sh && exit $DFS_ENABLE_RET
+        cp ./.update.sh ./update.sh && chmod +x ./update.sh && exit $DFS_UPDATED_RET
     else
         fmt_warning "won't really checkout in dev mode"
     fi
diff --git a/install.sh b/install.sh
index f7e7ad5..e94d4d2 100755
--- a/install.sh
+++ b/install.sh
@@ -219,7 +219,7 @@ install_update(){
     cp "${DOTFILES}/.update.sh" "${DOTFILES}/update.sh"
     chmod +x "${DOTFILES}/update.sh"
     fmt_note "running update.sh ..."
-    DFS_ENABLE_RET=1 ${DOTFILES}/update.sh
+    DFS_UPDATED_RET=1 ${DOTFILES}/update.sh
     if [[ $? == 1 ]]; then
         fmt_note "dfs updated. re-running install.sh ..."
         "${DOTFILES}/install.sh" && exit