diff --git a/debian/changelog b/debian/changelog
index c05bf2f..0b3b4d6 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,11 @@
+spark-store (3.1.5) stable; urgency=medium
+
+  * 改变更新策略，现在支持应用在更新时引入新依赖
+  * ss-apt-fast现在默认允许降级，以与apt使用体验一致
+
+
+-- shenmo <shenmo@spark-app.store>  Fri, 30 Jan 2022 00:00:00 +0800
+
 spark-store (3.1.4-2) stable; urgency=medium
 
   * 客户端下载使用metalink来支持bt下载加速
diff --git a/src/main.cpp b/src/main.cpp
index 6f93aba..13d1361 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -30,7 +30,7 @@ int main(int argc, char *argv[])
      DAboutDialog dialog;
       a.setAboutDialog(&dialog);
       dialog.setLicense(QObject::tr("We publish this program under GPL V3"));
-      dialog.setVersion(DApplication::buildVersion("Version 3.1.4-2"));
+      dialog.setVersion(DApplication::buildVersion("Version 3.1.5"));
       dialog.setProductIcon(QIcon::fromTheme("spark-store"));  // 设置Logo
       dialog.setProductName(QLabel::tr("Spark Store"));
       dialog.setDescription(
@@ -51,7 +51,7 @@ int main(int argc, char *argv[])
     a.setOrganizationName("spark-union");
     a.setOrganizationDomain("https://www.deepinos.org/");
     a.setApplicationName("Spark Store");    //不需要翻译，否则 ~/.local/share/ 下文件夹名称也被翻译为中文
-    a.setApplicationVersion(DApplication::buildVersion("3.1.4-2"));
+    a.setApplicationVersion(DApplication::buildVersion("3.1.5"));
     a.setApplicationAcknowledgementPage("https://gitee.com/deepin-community-store/spark-store");
     a.setApplicationDescription(
                 QObject::tr(
diff --git a/tool/ss-apt-fast b/tool/ss-apt-fast
index fd619ee..8e3299f 100755
--- a/tool/ss-apt-fast
+++ b/tool/ss-apt-fast
@@ -24,7 +24,7 @@ fi
 bwrap --dev-bind / / \
                    --bind '/tmp/ss-apt-fast-conf/apt-fast.conf' /etc/apt-fast.conf \
                    --bind '/opt/durapps/spark-store/bin/apt-fast-conf/sources.list.d/sparkstore.list' /etc/apt/sources.list.d/sparkstore.list \
-                apt-fast "$@"
+                apt-fast "$@" --allow-downgrades
 
 rm -rf  /tmp/ss-apt-fast-conf
 
diff --git a/tool/update-upgrade/ss-do-upgrade.sh b/tool/update-upgrade/ss-do-upgrade.sh
index 2013b2c..dd883bb 100755
--- a/tool/update-upgrade/ss-do-upgrade.sh
+++ b/tool/update-upgrade/ss-do-upgrade.sh
@@ -2,13 +2,41 @@
 
 echo "以上可升级，是否升级？[y/n]"
 read yes_or_no
-if [ "$yes_or_no" = "y" ];then
-mkdir -p /tmp/ss-apt-fast-conf/sources.list.d
+if [ "$yes_or_no" = "y" ];then ###这是确定是否同意
+
+echo "获取更新列表..."
+PKG_LIST="$(bwrap --dev-bind / / --bind '/opt/durapps/spark-store/bin/apt-fast-conf/sources.list.d/sparkstore.list' /etc/apt/sources.list.d/sparkstore.list apt list --upgradable -o Dir::Etc::sourcelist="sources.list.d/sparkstore.list"     -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0" | awk 'BEGIN {FS="/"} {print $1}' | awk NR\>1)"
 
 
-sudo ss-apt-fast upgrade -y -o Dir::Etc::sourcelist="sources.list.d/sparkstore.list"     -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"
+isuos=`cat /etc/os-release | grep UnionTech`
+if [ "$isuos" != "" ]; then ###这是确定是否为UOS
+echo "UOS中系统依赖无法使用第三方下载工具，放弃使用apt-fast"
+
+  for PKG_NAME in $PKG_LIST;
+  do
+    echo "$PKG_NAME 正在准备更新..."
+    if sudo bwrap --dev-bind / / --bind '/opt/durapps/spark-store/bin/apt-fast-conf/sources.list.d/sparkstore.list' /etc/apt/sources.list.d/sparkstore.list apt install "$PKG_NAME" -y >/dev/null 2>&1;
+    then
+      echo "$PKG_NAME 已更新"
+    else
+      echo "WARNING: $PKG_NAME 无法更新"
+    fi
+  done
+
+else ###这是确定是否为UOS
+
+  for PKG_NAME in $PKG_LIST;
+  do
+    echo "$PKG_NAME 正在准备更新..."
+    if sudo /usr/local/bin/ss-apt-fast install "$PKG_NAME" -y >/dev/null 2>&1;
+    then
+      echo "$PKG_NAME 已更新"
+    else
+      echo "WARNING: $PKG_NAME 无法更新"
+    fi
+  done
 
 
-else
-exit
-fi
\ No newline at end of file
+fi ###这是确定是否为UOS
+
+fi  ###这是确定是否同意
\ No newline at end of file
diff --git a/tool/update-upgrade/ss-update-controler.sh b/tool/update-upgrade/ss-update-controler.sh
index 09c70f6..bcd8c46 100755
--- a/tool/update-upgrade/ss-update-controler.sh
+++ b/tool/update-upgrade/ss-update-controler.sh
@@ -71,10 +71,9 @@ case $option in
 	;;
 
 	2)
-	echo "请注意：如果有些更新需要从系统获取更多依赖，你将需要手动操作 sudo ss-apt-fast upgrade"
 	echo "执行以下操作需要授权..."
 	sudo ss-apt-fast ssupdate
-    /opt/durapps/spark-store/bin/update-upgrade/ss-upgrade-list.sh
+       /opt/durapps/spark-store/bin/update-upgrade/ss-upgrade-list.sh
 	/opt/durapps/spark-store/bin/update-upgrade/ss-do-upgrade.sh
 	echo "---请按回车返回"
 	read