diff --git a/README.md b/README.md
index c1cc953..f933c09 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Lstu app for YunoHost
+# Lstu for YunoHost
 
 [![Integration level](https://dash.yunohost.org/integration/lstu.svg)](https://dash.yunohost.org/appci/app/lstu) ![](https://ci-apps.yunohost.org/ci/badges/lstu.status.svg) ![](https://ci-apps.yunohost.org/ci/badges/lstu.maintain.svg)  
 [![Install Lstu with YunoHost](https://install-app.yunohost.org/install-with-yunohost.png)](https://install-app.yunohost.org/?app=lstu)
@@ -31,27 +31,23 @@ How to configure this app: a plain file at `/var/www/lstu/lstu.conf` with SSH.
 
 #### Multi-user support
 
-Are LDAP and HTTP auth supported? **Yes**  
-Can the app be used by multiple users? **Yes**
+* Are LDAP and HTTP auth supported? **Yes**  
+* Can the app be used by multiple users? **Yes**
 
 #### Supported architectures
 
 * x86-64 - [![Build Status](https://ci-apps.yunohost.org/ci/logs/lstu%20%28Apps%29.svg)](https://ci-apps.yunohost.org/ci/apps/lstu/)
 * ARMv8-A - [![Build Status](https://ci-apps-arm.yunohost.org/ci/logs/lstu%20%28Apps%29.svg)](https://ci-apps-arm.yunohost.org/ci/apps/lstu/)
 
-**More info on the documentation page:**  
-https://yunohost.org/packaging_apps
-
 ## Links
 
  * Report a bug: https://github.com/YunoHost-Apps/lstu_ynh/issues
- * Upstream app repository: Link to the official repository of the upstream app.
+ * Upstream app repository: https://framagit.org/fiat-tux/hat-softwares/lstu
  * YunoHost website: https://yunohost.org/
 
 ---
 
-Developer info
-----------------
+## Developer info
 
 Please send your pull request to the [testing branch](https://github.com/YunoHost-Apps/lstu_ynh/tree/testing).
 
diff --git a/conf/lstu-minion@.service b/conf/lstu-minion@.service
index cc9931a..7363924 100644
--- a/conf/lstu-minion@.service
+++ b/conf/lstu-minion@.service
@@ -3,10 +3,10 @@ Description=Shortened URLs service job queue
 Documentation=https://framagit.org/luc/lstu
 
 [Service]
-Type=simple
+Type=forking
 User=www-data
 WorkingDirectory=__FINALPATH__
-ExecStart=/usr/local/bin/carton exec script/application minion worker
+ExecStart=/usr/bin/carton exec script/application minion worker
 
 [Install]
 WantedBy=multi-user.target
diff --git a/conf/systemd.service b/conf/systemd.service
index f7517e1..b499d7f 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -5,16 +5,15 @@ Requires=network.target
 After=network.target
 
 [Service]
-Type=simple
+Type=forking
 User=www-data
-RemainAfterExit=yes
 Restart=always
 RestartSec=10
 WorkingDirectory=__FINALPATH__
 PIDFile=__FINALPATH__/script/hypnotoad.pid
-ExecStart=/usr/local/bin/carton exec hypnotoad script/lstu
-ExecStop=/usr/local/bin/carton exec hypnotoad -s script/lstu
-ExecReload=/usr/local/bin/carton exec hypnotoad script/lstu
+ExecStart=/usr/bin/carton exec hypnotoad script/lstu
+ExecStop=/usr/bin/carton exec hypnotoad -s script/lstu
+ExecReload=/usr/bin/carton exec hypnotoad script/lstu
 
 [Install]
 WantedBy=multi-user.target
diff --git a/manifest.json b/manifest.json
index 2bf0e04..49b417f 100644
--- a/manifest.json
+++ b/manifest.json
@@ -14,7 +14,7 @@
 		"email": "abld@abld.info"
 	},
 	"requirements": {
-        "yunohost": ">= 3.5"
+        "yunohost": ">= 4.0"
 	},
 	"multi_instance": true,
 	"services": [
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 50159c9..95b18ef 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -5,7 +5,7 @@
 #=================================================
 
 # dependencies used by the app
-pkg_dependencies="build-essential libssl-dev zlib1g-dev libpng-dev libpq-dev memcached postgresql cpanminus"
+pkg_dependencies="build-essential libssl-dev zlib1g-dev libpng-dev libpq-dev memcached postgresql carton"
 
 #=================================================
 # PERSONAL HELPERS
diff --git a/scripts/install b/scripts/install
index 6f4bd70..d13242e 100644
--- a/scripts/install
+++ b/scripts/install
@@ -61,19 +61,12 @@ ynh_app_setting_set --app=$app --key=hashed_password --value=$hashed_password
 #=================================================
 # FIND AND OPEN A PORT
 #=================================================
-ynh_script_progression --message="Configuring firewall..."
+ynh_script_progression --message="Finding an available port..."
 
 # Find an available port
 port=$(ynh_find_port --port=8095)
 ynh_app_setting_set --app=$app --key=port --value=$port
 
-# Optional: Expose this port publicly
-# (N.B. : you only need to do this if the app actually needs to expose the port publicly.
-# If you do this and the app doesn't actually need you are CREATING SECURITY HOLES IN THE SERVER !)
-
-# Open the port
-ynh_exec_warn_less yunohost firewall allow --no-upnp TCP $port
-
 #=================================================
 # INSTALL DEPENDENCIES
 #=================================================
@@ -81,9 +74,6 @@ ynh_script_progression --message="Installing dependencies..."
 
 ynh_install_app_dependencies $pkg_dependencies
 
-# Install Carton
-echo yes | cpanm Carton
-
 #=================================================
 # CREATE A POSTGRESQL DATABASE
 #=================================================
diff --git a/scripts/remove b/scripts/remove
index f66f57f..328174a 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -83,16 +83,6 @@ ynh_script_progression --message="Removing logrotate configuration..."
 # Remove the app-specific logrotate config
 ynh_remove_logrotate
 
-#=================================================
-# CLOSE A PORT
-#=================================================
-
-if yunohost firewall list | grep -q "\- $port$"
-then
-	ynh_script_progression --message="Closing port $port..."
-	ynh_exec_warn_less yunohost firewall disallow TCP $port
-fi
-
 #=================================================
 # SPECIFIC REMOVE
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 98e822c..2b7145f 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -86,9 +86,6 @@ ynh_script_progression --message="Reinstalling dependencies..."
 # Define and install dependencies
 ynh_install_app_dependencies $pkg_dependencies
 
-# Install Carton
-echo yes | cpanm Carton
-
 #=================================================
 # RESTORE THE POSTGRESQL DATABASE
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index f73a794..ccd9121 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -90,6 +90,13 @@ if [ -z "$hashed_password" ]; then
 	ynh_app_setting_set --app=$app --key=hashed_password --value=$hashed_password
 fi
 
+# In previous versions, the port was mistakenly exposed to the outside world >_>
+if yunohost firewall list | grep -q "\- $port$"
+then
+	ynh_script_progression --message="Closing port $port..."
+	ynh_exec_warn_less yunohost firewall disallow TCP $port
+fi
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================