diff --git a/check_process b/check_process
index adfefd2b..edf1827d 100644
--- a/check_process
+++ b/check_process
@@ -24,6 +24,8 @@
 		upgrade=1	from_commit=9c7d0ff114bb0bd3482901fde4bd82b494aa2e6d
 		# 0.10.10~ynh1
 		upgrade=1	from_commit=1aa406fb124b92f03b1bb69fc3462936d5227278
+		# 0.10.10~ynh3
+		upgrade=1	from_commit=2a796e30dd521a5022586bc7fe59d189210028a4
 		backup_restore=1
 		multi_instance=1
 		port_already_use=0
@@ -42,3 +44,5 @@ Notification=all
 		name=0.10.9~ynh3
 	; commit=1aa406fb124b92f03b1bb69fc3462936d5227278
 		name=0.10.10~ynh1
+	; commit=2a796e30dd521a5022586bc7fe59d189210028a4
+		name=0.10.10~ynh3
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
index 546e9301..0afb8e4b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "ActivityPub Federated Image Sharing",
         "fr": "Logiciel de partage d'image fédéré via ActivityPub"
     },
-    "version": "0.10.10~ynh3",
+    "version": "0.10.10~ynh4",
     "url": "https://pixelfed.org/",
     "license": "AGPL-3.0-or-later",
     "maintainer": [
@@ -22,7 +22,7 @@
         }
     ],
     "requirements": {
-        "yunohost": ">= 4.1.3"
+        "yunohost": ">= 4.2.0"
     },
     "multi_instance": true,
     "services": [
diff --git a/scripts/install b/scripts/install
index 4911d50b..fb0cebaa 100644
--- a/scripts/install
+++ b/scripts/install
@@ -7,7 +7,6 @@
 #=================================================
 
 source _common.sh
-source ynh_composer__3
 source ynh_supervisor
 source /usr/share/yunohost/helpers
 
@@ -68,7 +67,7 @@ ynh_install_app_dependencies $pkg_dependencies
 ynh_script_progression --message="Configuring system user..."
 
 # Create a system user
-ynh_system_user_create --username=$app --home_dir="$final_path"
+ynh_system_user_create --username=$app --home_dir=$final_path
 
 #=================================================
 # CREATE A POSTGRESQL DATABASE
@@ -150,7 +149,7 @@ chown $app:$app "$final_path/.env"
 ynh_script_progression --message="Configuring a supervisor service..."
 
 # Create a dedicated supervisor config
-ynh_add_supervisor_config --service="${app}-horizon" --template=horizon.conf --others_var="phpversion"
+ynh_add_supervisor_config --service="${app}-horizon" --template=horizon.conf
 
 #=================================================
 # DEPLOY
diff --git a/scripts/restore b/scripts/restore
index 9d05f067..e0f7ed6a 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -60,7 +60,7 @@ ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 ynh_script_progression --message="Recreating the dedicated system user..."
 
 # Create the dedicated user (if not existing)
-ynh_system_user_create --username=$app --home_dir="$final_path"
+ynh_system_user_create --username=$app --home_dir=$final_path
 
 #=================================================
 # RESTORE THE APP MAIN DIR
diff --git a/scripts/upgrade b/scripts/upgrade
index 46f7a3ce..4521a87e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -7,7 +7,6 @@
 #=================================================
 
 source _common.sh
-source ynh_composer__3
 source ynh_supervisor
 source /usr/share/yunohost/helpers
 
@@ -35,18 +34,6 @@ ynh_script_progression --message="Checking version..."
 
 upgrade_type=$(ynh_check_app_version_changed)
 
-#=================================================
-# ENSURE DOWNWARD COMPATIBILITY
-#=================================================
-ynh_script_progression --message="Ensuring downward compatibility..."
-
-# Cleaning legacy permissions
-if ynh_legacy_permissions_exists; then
-	ynh_legacy_permissions_delete_all
-
-	ynh_app_setting_delete --app=$app --key=is_public
-fi
-
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -62,6 +49,18 @@ ynh_clean_setup () {
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+ynh_script_progression --message="Ensuring downward compatibility..."
+
+# Cleaning legacy permissions
+if ynh_legacy_permissions_exists; then
+	ynh_legacy_permissions_delete_all
+
+	ynh_app_setting_delete --app=$app --key=is_public
+fi
+
 #=================================================
 # ENSURE UPGRADE COMPATIBILITY
 #=================================================
@@ -97,7 +96,7 @@ if dpkg --compare-versions "0.10.9~ynh2" gt "$(ynh_read_manifest --manifest="/et
 
 	ynh_script_progression --message="Configuring a supervisor service..."
 	phpversion=$YNH_PHP_VERSION
-	ynh_add_supervisor_config --service="${app}-horizon" --template=horizon.conf --others_var="phpversion"
+	ynh_add_supervisor_config --service="${app}-horizon" --template=horizon.conf
 	
 	ynh_script_progression --message="Starting a supervisor service..."
 	ynh_supervisor_action --service_name="${app}-horizon" --action="start" --log_path="systemd" --line_match="success: ${app}-horizon"
@@ -236,7 +235,7 @@ ynh_add_config --template="../conf/cron" --destination="/etc/cron.d/$app"
 ynh_script_progression --message="Upgrading supervisor configuration..."
 
 # Create a dedicated supervisor config
-ynh_add_supervisor_config --service="${app}-horizon" --template=horizon.conf --others_var="phpversion"
+ynh_add_supervisor_config --service="${app}-horizon" --template=horizon.conf
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/ynh_composer__3 b/scripts/ynh_composer__3
deleted file mode 100644
index ca68a656..00000000
--- a/scripts/ynh_composer__3
+++ /dev/null
@@ -1,61 +0,0 @@
-#!/bin/bash
-
-readonly YNH_DEFAULT_COMPOSER_VERSION=1.10.17
-# Declare the actual composer version to use.
-# A packager willing to use another version of composer can override the variable into its _common.sh.
-YNH_COMPOSER_VERSION=${YNH_COMPOSER_VERSION:-$YNH_DEFAULT_COMPOSER_VERSION}
-
-# Execute a command with Composer
-#
-# usage: ynh_composer_exec [--phpversion=phpversion] [--workdir=$final_path] --commands="commands"
-# | arg: -v, --phpversion - PHP version to use with composer
-# | arg: -w, --workdir - The directory from where the command will be executed. Default $final_path.
-# | arg: -c, --commands - Commands to execute.
-ynh_composer_exec () {
-	# Declare an array to define the options of this helper.
-	local legacy_args=vwc
-	declare -Ar args_array=( [v]=phpversion= [w]=workdir= [c]=commands= )
-	local phpversion
-	local workdir
-	local commands
-	# Manage arguments with getopts
-	ynh_handle_getopts_args "$@"
-	workdir="${workdir:-$final_path}"
-	phpversion="${phpversion:-$YNH_PHP_VERSION}"
-
-	COMPOSER_HOME="$workdir/.composer" \
-		php${phpversion} "$workdir/composer.phar" $commands \
-		-d "$workdir" --quiet --no-interaction
-}
-
-# Install and initialize Composer in the given directory
-#
-# usage: ynh_install_composer [--phpversion=phpversion] [--workdir=$final_path] [--install_args="--optimize-autoloader"] [--composerversion=composerversion]
-# | arg: -v, --phpversion - PHP version to use with composer
-# | arg: -w, --workdir - The directory from where the command will be executed. Default $final_path.
-# | arg: -a, --install_args - Additional arguments provided to the composer install. Argument --no-dev already include
-# | arg: -c, --composerversion - Composer version to install
-ynh_install_composer () {
-	# Declare an array to define the options of this helper.
-	local legacy_args=vwa
-	declare -Ar args_array=( [v]=phpversion= [w]=workdir= [a]=install_args= [c]=composerversion=)
-	local phpversion
-	local workdir
-	local install_args
-	local composerversion
-	# Manage arguments with getopts
-	ynh_handle_getopts_args "$@"
-	workdir="${workdir:-$final_path}"
-	phpversion="${phpversion:-$YNH_PHP_VERSION}"
-	install_args="${install_args:-}"
-	composerversion="${composerversion:-$YNH_COMPOSER_VERSION}"
-
-	curl -sS https://getcomposer.org/installer \
-		| COMPOSER_HOME="$workdir/.composer" \
-		php${phpversion} -- --quiet --install-dir="$workdir" --version=$composerversion \
-		|| ynh_die "Unable to install Composer."
-
-	# update dependencies to create composer.lock
-	ynh_composer_exec --phpversion="${phpversion}" --workdir="$workdir" --commands="install --no-dev $install_args" \
-		|| ynh_die "Unable to update core dependencies with Composer."
-}
diff --git a/scripts/ynh_supervisor b/scripts/ynh_supervisor
index 340c13e9..be6d47b7 100644
--- a/scripts/ynh_supervisor
+++ b/scripts/ynh_supervisor
@@ -2,27 +2,20 @@
 
 # Create a dedicated supervisor config
 #
-# usage: ynh_add_supervisor_config [--service=service] [--template=template]  [--others_var="list of others variables to replace"]
-# | arg: -s, --service= - Service name (optionnal, $app by default)
-# | arg: -t, --template= - Name of template file (optionnal, this is 'supervisor' by default, meaning ./conf/supervisor.service will be used as template)
-# | arg: -v, --others_var=  - List of others variables to replace separated by a space. For example: 'var_1 var_2 ...'
+# usage: ynh_add_supervisor_config [--service=service] [--template=template]
+# | arg: -s, --service=     - Service name (optionnal, `$app` by default)
+# | arg: -t, --template=    - Name of template file (optionnal, this is 'supervisor' by default, meaning ./conf/supervisor.service will be used as template)
 #
-# This will use the template ../conf/<templatename>.service
-# to generate a supervisor config, by replacing the following keywords
-# with global variables that should be defined before calling
-# this helper :
+# This will use the template `../conf/<templatename>.service`.
 #
-#   __APP__       by  $app
-#   __FINALPATH__ by  $final_path
-#
-# And dynamic variables (from the last example) :
-#   __VAR_1__    by $var_1
-#   __VAR_2__    by $var_2
+# See the documentation of `ynh_add_config` for a description of the template
+# format and how placeholders are replaced with actual variables.
 #
+# Requires YunoHost version 2.7.11 or higher.
 ynh_add_supervisor_config () {
     # Declare an array to define the options of this helper.
     local legacy_args=stv
-    local -A args_array=( [s]=service= [t]=template= [v]=others_var= )
+    local -A args_array=( [s]=service= [t]=template= [v]=others_var=)
     local service
     local template
     local others_var
@@ -32,30 +25,10 @@ ynh_add_supervisor_config () {
     local template="${template:-supervisor.service}"
     others_var="${others_var:-}"
 
-    finalsupervisorconf="/etc/supervisor/conf.d/$service.conf"
-    ynh_backup_if_checksum_is_different --file="$finalsupervisorconf"
-    cp ../conf/$template "$finalsupervisorconf"
+    [[ -z "$others_var" ]] || ynh_print_warn --message="Packagers: using --others_var is unecessary since Yunohost 4.2"
 
-    # To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
-    # Substitute in a nginx config file only if the variable is not empty
-    if [ -n "${final_path:-}" ]; then
-        ynh_replace_string --match_string="__FINALPATH__" --replace_string="$final_path" --target_file="$finalsupervisorconf"
-    fi
-    if [ -n "${app:-}" ]; then
-        ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="$finalsupervisorconf"
-    fi
+    ynh_add_config --template="$YNH_APP_BASEDIR/conf/$template" --destination="/etc/supervisor/conf.d/$service.conf"
 
-    # Replace all other variables given as arguments
-    for var_to_replace in $others_var
-    do
-        # ${var_to_replace^^} make the content of the variable on upper-cases
-        # ${!var_to_replace} get the content of the variable named $var_to_replace 
-        ynh_replace_string --match_string="__${var_to_replace^^}__" --replace_string="${!var_to_replace}" --target_file="$finalsupervisorconf"
-    done
-
-    ynh_store_file_checksum --file="$finalsupervisorconf"
-
-    chown root: "$finalsupervisorconf"
     supervisorctl reread
     supervisorctl update
 }
@@ -63,8 +36,9 @@ ynh_add_supervisor_config () {
 # Remove the dedicated supervisor config
 #
 # usage: ynh_remove_supervisor_config [--service=service]
-# | arg: -s, --service= - Service name (optionnal, $app by default)
+# | arg: -s, --service=     - Service name (optionnal, $app by default)
 #
+# Requires YunoHost version 2.7.2 or higher.
 ynh_remove_supervisor_config () {
     # Declare an array to define the options of this helper.
     local legacy_args=s
@@ -86,14 +60,15 @@ ynh_remove_supervisor_config () {
 
 # Start (or other actions) a service,  print a log in case of failure and optionnaly wait until the service is completely started
 #
-# usage: ynh_supervisor_action [-n service_name] [-a action] [ [-l "line to match"] [-p log_path] [-t timeout] [-e length] ]
-# | arg: -n, --service_name= - Name of the service to start. Default : $app
+# usage: ynh_supervisor_action [--service_name=service_name] [--action=action] [ [--line_match="line to match"] [--log_path=log_path] [--timeout=300] [--length=20] ]
+# | arg: -n, --service_name= - Name of the service to start. Default : `$app`
 # | arg: -a, --action=       - Action to perform with supervisorctl. Default: start
-# | arg: -l, --line_match=   - Line to match - The line to find in the log to attest the service have finished to boot. If not defined it don't wait until the service is completely started. WARNING: When using --line_match, you should always add `ynh_clean_check_starting` into your `ynh_clean_setup` at the beginning of the script. Otherwise, tail will not stop in case of failure of the script. The script will then hang forever.
-# | arg: -p, --log_path=     - Log file - Path to the log file. Default : /var/log/$app/$app.log
+# | arg: -l, --line_match=   - Line to match - The line to find in the log to attest the service have finished to boot. If not defined it don't wait until the service is completely started.
+# | arg: -p, --log_path=     - Log file - Path to the log file. Default : `/var/log/$app/$app.log`
 # | arg: -t, --timeout=      - Timeout - The maximum time to wait before ending the watching. Default : 300 seconds.
 # | arg: -e, --length=       - Length of the error log : Default : 20
 #
+# Requires YunoHost version 3.5.0 or higher.
 ynh_supervisor_action() {
     # Declare an array to define the options of this helper.
     local legacy_args=nalpte
@@ -118,7 +93,8 @@ ynh_supervisor_action() {
     then
         local templog="$(mktemp)"
         # Following the starting of the app in its log
-        if [ "$log_path" == "systemd" ] ; then
+        if [ "$log_path" == "systemd" ]
+        then
             # Read the supervisor journal
             journalctl --unit=supervisor --follow --since=-0 --quiet > "$templog" &
             # Get the PID of the journalctl command
@@ -144,16 +120,16 @@ ynh_supervisor_action() {
         # If a log is specified for this service, show also the content of this log
         if [ -e "$log_path" ]
         then
-            ynh_print_err --message="--"
             ynh_exec_err tail --lines=$length "$log_path"
         fi
-        # Fail the app script, since the service failed.
-        ynh_die
+        ynh_clean_check_starting
+        return 1
     fi
 
     # Start the timeout and try to find line_match
     if [[ -n "${line_match:-}" ]]
     then
+        set +x
         local i=0
         for i in $(seq 1 $timeout)
         do
@@ -171,6 +147,7 @@ ynh_supervisor_action() {
             fi
             sleep 1
         done
+        set -x
         if [ $i -ge 3 ]; then
             echo "" >&2
         fi