diff --git a/image/pro_seafile_7.1/Dockerfile b/image/pro_seafile_7.1/Dockerfile
index b918506..90766fc 100644
--- a/image/pro_seafile_7.1/Dockerfile
+++ b/image/pro_seafile_7.1/Dockerfile
@@ -5,7 +5,7 @@ FROM phusion/baseimage:0.11
 RUN apt-get update --fix-missing
 
 # Utility tools
-RUN apt-get install -y vim htop net-tools psmisc wget curl
+RUN apt-get install -y vim htop net-tools psmisc wget curl git
 
 # For suport set local time zone.
 RUN export DEBIAN_FRONTEND=noninteractive && apt-get install tzdata -y
diff --git a/image/seafile_7.1/Dockerfile b/image/seafile_7.1/Dockerfile
index bdf6592..d21b899 100644
--- a/image/seafile_7.1/Dockerfile
+++ b/image/seafile_7.1/Dockerfile
@@ -5,7 +5,7 @@ FROM phusion/baseimage:0.11
 RUN apt-get update --fix-missing
 
 # Utility tools
-RUN apt-get install -y vim htop net-tools psmisc wget curl
+RUN apt-get install -y vim htop net-tools psmisc wget curl git
 
 # For suport set local time zone.
 RUN export DEBIAN_FRONTEND=noninteractive && apt-get install tzdata -y
diff --git a/scripts_7.1/auto_renew_crt.sh b/scripts_7.1/auto_renew_crt.sh
index 5d16aca..67291aa 100755
--- a/scripts_7.1/auto_renew_crt.sh
+++ b/scripts_7.1/auto_renew_crt.sh
@@ -16,7 +16,7 @@ renew_cert_script=/scripts/renew_cert.sh
 if [[ ! -x ${renew_cert_script} ]]; then
     cat > ${renew_cert_script} << EOF
 #!/bin/bash
-python ${letsencrypt_script} --account-key ${ssldir}/${ssl_account_key} --csr ${ssldir}/${ssl_csr} --acme-dir /var/www/challenges/ > ${ssldir}/${ssl_crt} || exit
+python3 ${letsencrypt_script} --account-key ${ssldir}/${ssl_account_key} --csr ${ssldir}/${ssl_csr} --acme-dir /var/www/challenges/ > ${ssldir}/${ssl_crt} || exit
 $(which nginx) -s reload
 EOF
 
diff --git a/scripts_7.1/ssl.sh b/scripts_7.1/ssl.sh
index 3f53bd9..e9ec8d4 100755
--- a/scripts_7.1/ssl.sh
+++ b/scripts_7.1/ssl.sh
@@ -37,7 +37,7 @@ if [[ ! -e ${ssl_csr} ]]; then
     openssl req -new -sha256 -key ${ssl_key} -subj "/CN=$domain" > $ssl_csr
 fi
 
-python $letsencrypt_script --account-key ${ssl_account_key} --csr $ssl_csr --acme-dir /var/www/challenges/ > ./signed.crt
+python3 $letsencrypt_script --account-key ${ssl_account_key} --csr $ssl_csr --acme-dir /var/www/challenges/ > ./signed.crt
 curl -sSL -o intermediate.pem https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.pem
 cat signed.crt intermediate.pem > ${ssl_crt}
 
diff --git a/scripts_7.1/utils/__init__.py b/scripts_7.1/utils/__init__.py
index 5a92d56..5532c49 100644
--- a/scripts_7.1/utils/__init__.py
+++ b/scripts_7.1/utils/__init__.py
@@ -144,7 +144,7 @@ def get_process_cmd(pid, env=False):
     env = 'e' if env else ''
     try:
         return subprocess.check_output('ps {} -o command {}'.format(env, pid),
-                                       shell=True).strip().splitlines()[1]
+                                       shell=True).decode('utf8').strip().splitlines()[1]
     # except Exception, e:
     #     print(e)
     except:
@@ -153,7 +153,7 @@ def get_process_cmd(pid, env=False):
 def get_match_pids(pattern):
     pgrep_output = subprocess.check_output(
         'pgrep -f "{}" || true'.format(pattern),
-        shell=True).strip()
+        shell=True).decode('utf8').strip()
     return [int(pid) for pid in pgrep_output.splitlines()]
 
 def ask_for_confirm(msg):
@@ -171,7 +171,7 @@ def git_current_commit():
 
 def get_command_output(cmd):
     shell = not isinstance(cmd, list)
-    return subprocess.check_output(cmd, shell=shell)
+    return subprocess.check_output(cmd, shell=shell).decode('utf8')
 
 def ask_yes_or_no(msg, prompt='', default=None):
     print('\n' + msg + '\n')