diff --git a/xcpkg b/xcpkg
index b57fb98..f87ac49 100755
--- a/xcpkg
+++ b/xcpkg
@@ -189,7 +189,7 @@ version_match() {
 ##############################################################################
 # {{{ wfetch
 
-# wfetch <URL> [--uri=<URL-MIRROR>] [--sha256=<SHA256>] [-o <OUTPUT-PATH>] [-q]
+# wfetch <URL> [--uri=<URL-MIRROR>] [--sha256=<SHA256>] [-o <OUTPUT-PATH>] [-q] [--no-buffer]
 #
 # If -o <OUTPUT-PATH> option is specified, the result will be written to file, otherwize, the result will be written to stdout.
 #
@@ -218,6 +218,8 @@ wfetch() {
 
     unset FETCH_SILENT
 
+    unset NOT_BUFFER
+
     [ -z "$1" ] && abort 1 "wfetch <URL> [OPTION]... , <URL> must be non-empty."
 
     if [ -z "$XCPKG_URL_TRANSFORM" ] ; then
@@ -248,6 +250,9 @@ wfetch() {
                 FETCH_SILENT=1
                 RUN_SILENT=1
                 ;;
+            --no-buffer)
+                NOT_BUFFER=1
+                ;;
             *)  abort 1 "wfetch <URL> [--uri=<URL-MIRROR>] [--sha256=<SHA256>] [-o <PATH>] [-q] , unrecognized option: $1"
         esac
         shift
@@ -294,11 +299,15 @@ wfetch() {
             fi
         fi
 
-        FETCH_UTS="$(date +%s)"
+        if [ "$NOT_BUFFER" = 1 ] ; then
+            FETCH_BUFFER_FILEPATH="$FETCH_OUTPUT_FILEPATH"
+        else
+            FETCH_UTS="$(date +%s)"
 
-        FETCH_SHA="$(printf '%s\n' "$FETCH_URL:$$:$FETCH_UTS" | sha256sum | cut -d ' ' -f1)"
+            FETCH_SHA="$(printf '%s\n' "$FETCH_URL:$$:$FETCH_UTS" | sha256sum | cut -d ' ' -f1)"
 
-        FETCH_BUFFER_FILEPATH="$FETCH_OUTPUT_DIR/$FETCH_SHA.tmp"
+            FETCH_BUFFER_FILEPATH="$FETCH_OUTPUT_DIR/$FETCH_SHA.tmp"
+        fi
     fi
 
     for FETCH_TOOL in curl wget http lynx aria2c axel
@@ -370,7 +379,9 @@ wfetch() {
             fi
         fi
 
-        run mv "$FETCH_BUFFER_FILEPATH" "$FETCH_OUTPUT_FILEPATH"
+        if [ "$NOT_BUFFER" != 1 ] ; then
+            run mv "$FETCH_BUFFER_FILEPATH" "$FETCH_OUTPUT_FILEPATH"
+        fi
     fi
 }
 
@@ -7012,7 +7023,7 @@ __setup_uppm() {
 
     ##################################################################################
 
-    wfetch 'https://raw.githubusercontent.com/leleliu008/uppm/master/latest-release' -o uppm-latest-release
+    wfetch 'https://raw.githubusercontent.com/leleliu008/uppm/master/latest-release' -o uppm-latest-release --no-buffer
 
     ##################################################################################
 
@@ -7033,14 +7044,14 @@ __setup_uppm() {
         UPPM_LATEST_RELEASE_ARCHIVE_FILENAME="uppm-${UPPM_LATEST_RELEASE_VERSION}-${NATIVE_OS_KIND}-${NATIVE_OS_ARCH}.tar.xz"
     fi
 
-    wfetch "https://github.com/leleliu008/uppm/releases/download/${UPPM_LATEST_RELEASE_TAGNAME}/${UPPM_LATEST_RELEASE_ARCHIVE_FILENAME}" -o "$UPPM_LATEST_RELEASE_ARCHIVE_FILENAME"
+    wfetch "https://github.com/leleliu008/uppm/releases/download/${UPPM_LATEST_RELEASE_TAGNAME}/${UPPM_LATEST_RELEASE_ARCHIVE_FILENAME}" -o "$UPPM_LATEST_RELEASE_ARCHIVE_FILENAME" --no-buffer
 
     run tar xvf "$UPPM_LATEST_RELEASE_ARCHIVE_FILENAME" --strip-components=1 --no-same-owner
 
     ##################################################################################
 
     # https://curl.se/docs/caextract.html
-    wfetch 'https://curl.se/ca/cacert.pem' -o .
+    wfetch 'https://curl.se/ca/cacert.pem' -o cacert.pem --no-buffer
 
     ##################################################################################
 
@@ -7702,7 +7713,7 @@ main() {
 
     XCPKG="$CURRENT_SCRIPT_FILEPATH"
 
-    XCPKG_VERSION=0.15.8
+    XCPKG_VERSION=0.15.9
 
     XCPKG_OFFICAL_FORMULA_REPO_URL='https://github.com/leleliu008/xcpkg-formula-repository-offical-core'