diff --git a/common.sh b/common.sh
index 490ddf2..38e5ea0 100755
--- a/common.sh
+++ b/common.sh
@@ -33,6 +33,7 @@ function cloneOrUpdate() {
                 mkdir ${name}
             else
                 echo "${name}已是最新版本，无需更新"
+		cd ${name}
                 return
             fi
         fi
diff --git a/install_ndn-cxx.sh b/install_ndn-cxx.sh
index c045222..0fb7b0f 100755
--- a/install_ndn-cxx.sh
+++ b/install_ndn-cxx.sh
@@ -10,6 +10,8 @@ NDN_CXX_VERSION=0.6.6
 sudo apt-get install build-essential libsqlite3-dev libssl-dev curl tar -y
 sudo apt-get install doxygen graphviz python-sphinx python-pip  python3-sphinx python3-pip  -y
 sudo pip3 install sphinxcontrib-doxylink sphinxcontrib-googleanalytics
+pip3 install --upgrade pip
+pip3 install --upgrade setuptools
 
 # install ndn-cxx
 cloneOrUpdate ndn-cxx https://github.com/named-data/ndn-cxx/archive/ndn-cxx-${NDN_CXX_VERSION}.tar.gz ${NDN_CXX_VERSION}