diff --git a/README.md b/README.md
index c36eabc5..d489ff55 100644
--- a/README.md
+++ b/README.md
@@ -5,13 +5,21 @@ testing environments for ILIAS. It will create and provision a docker container
 according to your requirements, pull the ILIAS version you want to use and even
 install it if possible.
 
-## Setup
+## Installation
 
-1. download and unpack the [latest release](https://github.com/conceptsandtraining/ilias-tool-doil/releases)
+1. download and unpack the [latest release](https://github.com/conceptsandtraining/doil/releases)
 1. execute `sudo ./install.sh` in order to install **doil**
 1. you can remove the downloaded folder afterwards
 1. check `doil help` for available commands and further instructions
 
+## Update
+
+If you alread installed **doil** you can easily update with following steps:
+
+1. download and unpack the [latest release](https://github.com/conceptsandtraining/doil/releases)
+1. execute `sudo ./update.sh` in order to update **doil**
+1. you can remove the downloaded folder afterwards
+
 ## Dependencies
 
 **doil** tries to use as little 3rd party software on the host system as possible.
@@ -136,3 +144,12 @@ users, so make sure to understand what you are doing.
 * `doil salt:update` updates the saltstack if you are using a custom saltstack
 * `doil salt:login` logs the user into the main salt server
 * `doil salt:prune` prunes the main salt server
+
+## Changelog
+
+### 1.0.1
+
+* Fixed a bug in linux templates where the port 80 is blocked so no machine
+  could be started
+* Added update script
+* Changed readme (thanks @Rillke)
\ No newline at end of file
diff --git a/install.sh b/install.sh
index 1afb61ec..e283b62e 100755
--- a/install.sh
+++ b/install.sh
@@ -23,7 +23,7 @@
 #    ,' | /  ;'
 #   (,,/ (,,/      Thanks to Concepts and Training for supporting doil
 #
-# Last revised 2021-02-08
+# Last revised 2021-03-23
 
 # sudo user check
 if [ "$EUID" -ne 0 ]
diff --git a/src/lib/instances/create/create.sh b/src/lib/instances/create/create.sh
index 643aff8d..6df369d2 100755
--- a/src/lib/instances/create/create.sh
+++ b/src/lib/instances/create/create.sh
@@ -190,10 +190,16 @@ echo "[${NOW}] Copying necessary files"
 
 # docker stuff
 cp "/usr/local/lib/doil/tpl/minion/run-supervisor.sh" "${FOLDERPATH}/conf/run-supervisor.sh"
-cp "/usr/local/lib/doil/tpl/minion/docker-compose.yml" "${FOLDERPATH}/docker-compose.yml"
 cp "/usr/local/lib/doil/tpl/minion/Dockerfile" "${FOLDERPATH}/Dockerfile"
 cp "/usr/local/lib/doil/tpl/stack/config/minion.cnf" "${FOLDERPATH}/conf/minion.cnf"
 cp "/usr/local/lib/doil/tpl/minion/salt-minion.conf" "${FOLDERPATH}/conf/salt-minion.conf"
+if [[ ${HOST} == 'linux' ]]
+then
+  cp "/usr/local/lib/doil/tpl/minion/docker-compose.yml" "${FOLDERPATH}/docker-compose.yml"
+elif [[ ${HOST} == 'mac' ]]
+then
+  cp "/usr/local/lib/doil/tpl/minion/docker-compose-mac.yml" "${FOLDERPATH}/docker-compose.yml"
+fi 
 
 # setting up config file
 touch "${FOLDERPATH}/conf/doil.conf"
@@ -254,7 +260,7 @@ fi
 until [[ ! -z ${DCMAINSALTSERVICE} ]]
 do
   echo "Master service not ready ..."
-  sleep 0.1
+  doil salt:restart
 done
 echo "Master service ready."
 
@@ -301,14 +307,14 @@ fi
 # check if the new key is registered
 SALTKEYS=$(docker exec -t -i ${DCMAINHASH} /bin/bash -c "salt-key -L" | grep "${NAME}.local")
 
-if [ ! -z ${SALTKEYS} ]
+if [[ ! -z ${SALTKEYS} ]]
 then
   echo "Key not ready yet"
   sleep 5
 
   SALTKEYS=$(docker exec -t -i ${DCMAINHASH} /bin/bash -c "salt-key -L" | grep "${NAME}.local")
 
-  if [ ! -z ${SALTKEYS} ]
+  if [[ ! -z ${SALTKEYS} ]]
   then
     echo "Key not ready yet"
     sleep 5
diff --git a/src/tpl/minion/docker-compose-mac.yml b/src/tpl/minion/docker-compose-mac.yml
new file mode 100644
index 00000000..9fd1303d
--- /dev/null
+++ b/src/tpl/minion/docker-compose-mac.yml
@@ -0,0 +1,36 @@
+version: "3.5"
+services:
+  %TPL_PROJECT_NAME%:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: doil/%TPL_PROJECT_NAME%:stable
+    container_name: %TPL_PROJECT_NAME%
+    hostname: %TPL_PROJECT_NAME%
+    domainname: local
+    ports:
+      - "80:80"
+    volumes:
+      - ./volumes/ilias:/var/www/html
+      - ./volumes/data:/var/ilias/data
+      - ./volumes/db/:/var/lib/mysql
+      - ./volumes/index:/var/ilias/index
+      - ./volumes/logs:/var/ilias/logs
+      - ./volumes/logs/error/:/var/ilias/logs/error
+      - ./volumes/logs/apache:/var/log/apache2
+      - ./conf/minion.cnf:/etc/salt/minion
+      - type: bind
+        source: ./conf/salt-minion.conf
+        target: /etc/supervisor/conf.d/salt-minion.conf
+    environment:
+      - ILIAS_INI_PATH=/var/www/html/ilias.ini.php
+      - TZ=Europe/Berlin
+      - JAVA_SERVER_PATH=/var/www/html/Services/WebServices/RPC/lib
+      - JAVA_SERVER_START
+    networks:
+      - main_saltnet
+networks:
+  main_saltnet:
+    external: true
+volumes:
+    persistent:
diff --git a/src/tpl/minion/docker-compose.yml b/src/tpl/minion/docker-compose.yml
index 9fd1303d..0e79cfc7 100644
--- a/src/tpl/minion/docker-compose.yml
+++ b/src/tpl/minion/docker-compose.yml
@@ -8,8 +8,6 @@ services:
     container_name: %TPL_PROJECT_NAME%
     hostname: %TPL_PROJECT_NAME%
     domainname: local
-    ports:
-      - "80:80"
     volumes:
       - ./volumes/ilias:/var/www/html
       - ./volumes/data:/var/ilias/data
diff --git a/update.sh b/update.sh
new file mode 100755
index 00000000..69628d0f
--- /dev/null
+++ b/update.sh
@@ -0,0 +1,135 @@
+#!/bin/bash
+
+# doil is a tool that creates and manages multiple docker container
+# with ILIAS and comes with several tools to help manage everything.
+# It is able to download ILIAS and other ILIAS related software
+# like cate.
+#
+# Copyright (C) 2020 - 2021 Laura Herzog (laura.herzog@concepts-and-training.de)
+# Permission to copy and modify is granted under the AGPL license
+#
+# Contribute: https://github.com/conceptsandtraining/ilias-tool-doil
+#
+#                    .-.
+#                   / /
+#                  / |
+#    |\     ._ ,-""  `.
+#    | |,,_/  7        ;
+#  `;=     ,=(     ,  /
+#   |`q  q  ` |    \_,|
+#  .=; <> _ ; /  ,/'/ |
+# ';|\,j_ \;=\ ,/   `-'
+#     `--'_|\  )
+#    ,' | /  ;'
+#   (,,/ (,,/      Thanks to Concepts and Training for supporting doil
+#
+# Last revised 2021-03-23
+
+# sudo user check
+if [ "$EUID" -ne 0 ]
+then
+  echo -e "\033[1mREQUIREMENT ERROR:\033[0m"
+  echo -e "\tPlease execute this script as sudo user!"
+  exit
+fi
+
+CHECK_DOCKER=$(docker --version | tail -n 1 | cut -d " " -f 3 | cut -c 1-5)
+vercomp () {
+  if [[ $1 == $2 ]]
+  then
+    return 0
+  fi
+  local IFS=.
+  local i ver1=($1) ver2=($2)
+  # fill empty fields in ver1 with zeros
+  for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
+  do
+    ver1[i]=0
+  done
+  for ((i=0; i<${#ver1[@]}; i++))
+  do
+    if [[ -z ${ver2[i]} ]]
+    then
+      # fill empty fields in ver2 with zeros
+      ver2[i]=0
+    fi
+    if ((10#${ver1[i]} > 10#${ver2[i]}))
+    then
+      return 1
+    fi
+    if ((10#${ver1[i]} < 10#${ver2[i]}))
+    then
+      return 2
+    fi
+  done
+  return 0
+}
+
+testvercomp () {
+  vercomp $1 $2
+  case $? in
+    0) op='=';;
+    1) op='>';;
+    2) op='<';;
+  esac
+  if [[ $op != $3 ]]
+  then
+    echo -e "\033[1mREQUIREMENT ERROR:\033[0m"
+    echo -e "\tYour docker version is not supported!"
+    echo -e "\tdoil requires at least docker version \033[1m19.03\033[0m. You have \033[1m${CHECK_DOCKER}\033[0m installed."
+    exit
+  fi
+}
+testvercomp ${CHECK_DOCKER} "19.02" ">"
+
+# check the OS
+OPS=""
+case "$(uname -s)" in
+  Darwin)
+    OPS="mac"
+	  ;;
+  Linux)
+    OPS="linux"
+	  ;;
+  *)
+    echo -e "\033[1mREQUIREMENT ERROR:\033[0m"
+    echo -e "\tYour operating system is not supported!"
+    exit
+    ;;
+esac
+
+################################
+# Removing old version if needed
+NOW=$(date +'%d.%m.%Y %I:%M:%S')
+echo "[${NOW}] Removing old version"
+
+if [ -f "/usr/local/bin/doil" ]
+then
+  rm /usr/local/bin/doil
+fi
+if [ -d "/usr/local/lib/doil" ]
+then
+  rm -rf /usr/local/lib/doil/lib
+fi
+
+#########################
+# Copying the doil system
+NOW=$(date +'%d.%m.%Y %I:%M:%S')
+echo "[${NOW}] Copying the doil system"
+
+# Move the base script to the /usr/local/bin folder and make it executeable
+cp src/doil.sh /usr/local/bin/doil
+chmod a+x /usr/local/bin/doil
+
+# Move the script library to /usr/local/lib/doil
+if [ ! -d "/usr/local/lib/doil" ]
+then
+  mkdir /usr/local/lib/doil
+fi
+cp -r src/lib /usr/local/lib/doil/lib
+chmod -R a+x /usr/local/lib/doil/lib
+
+#################
+# Everything done
+NOW=$(date +'%d.%m.%Y %I:%M:%S')
+echo "[${NOW}] Everything done"
\ No newline at end of file