diff --git a/manifest.json b/manifest.json
index 3e66647..8c51d36 100644
--- a/manifest.json
+++ b/manifest.json
@@ -5,7 +5,7 @@
     "description": {
         "en": "Open source asset management"
     },
-    "version": "4.6.15~ynh1",
+    "version": "4.6.15~ynh2",
     "url": "https://snipeitapp.com/",
     "license": "MIT",
     "maintainer": {
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 2d0da4d..25f54e4 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -29,37 +29,53 @@ exec_as() {
   fi
 }
 
-
-# Execute a composer command from a given directory
-# usage: composer_exec AS_USER WORKDIR COMMAND [ARG ...]
-exec_composer() {
-	local AS_USER=$1
-	local WORKDIR=$2
-	shift 2
-
-	exec_as "$AS_USER" COMPOSER_HOME="${WORKDIR}/.composer" \
-		php "${WORKDIR}/composer.phar" $@ \
-		-d "${WORKDIR}" --quiet --no-interaction
-}
-
-# Install and initialize Composer in the given directory
-# usage: init_composer destdir
-init_composer() {
-	local AS_USER=$1
-	local WORKDIR=$2
-
-	# install composer
-	curl -sS https://getcomposer.org/installer \
-		| COMPOSER_HOME="${WORKDIR}/.composer" \
-		php -- --quiet --install-dir="$WORKDIR" \
-		|| ynh_die "Unable to install Composer"
-
-
-	# update dependencies to create composer.lock
-	exec_composer "$AS_USER" "$WORKDIR" install  --no-dev --prefer-source \
-		|| ynh_die "Unable to update core dependencies with Composer"
-}
-
 #=================================================
 # FUTURE OFFICIAL HELPERS
 #=================================================
+
+# Execute a command with Composer
+#
+# usage: ynh_composer_exec --phpversion=phpversion [--workdir=$final_path] --commands="commands"
+# | 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="${phpversion:-7.0}"
+
+	COMPOSER_HOME="$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]
+# | arg: -w, --workdir - The directory from where the command will be executed. Default $final_path.
+ynh_install_composer () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=vw
+	declare -Ar args_array=( [v]=phpversion= [w]=workdir= )
+	local phpversion
+	local workdir
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	workdir="${workdir:-$final_path}"
+	phpversion="${phpversion:-7.0}"
+
+	curl -sS https://getcomposer.org/installer \
+		| COMPOSER_HOME="$workdir/.composer" \
+		php${phpversion} -- --quiet --install-dir="$workdir" \
+		|| ynh_die "Unable to install Composer."
+
+	# update dependencies to create composer.lock
+	ynh_composer_exec --phpversion="${phpversion}" --workdir="$workdir" --commands="install --no-dev" \
+		|| ynh_die "Unable to update core dependencies with Composer."
+}
\ No newline at end of file
diff --git a/scripts/install b/scripts/install
index 5694509..7383cb3 100755
--- a/scripts/install
+++ b/scripts/install
@@ -161,15 +161,15 @@ ynh_script_progression --message="Configuring php-fpm..." --time --weight=1
 # Create a dedicated php-fpm config
 ynh_add_fpm_config
 
-( cd $final_path && curl -sS https://getcomposer.org/installer | php )
-( cd $final_path && /usr/bin/php composer.phar install --no-dev --prefer-source )
-
 #=================================================
 # SPECIFIC SETUP
 #=================================================
-# ...
+# INSTALL AND INITIALIZE COMPOSER
 #=================================================
+ynh_script_progression --message="Installing composer..." --time --weight=1
 
+# Install composer
+ynh_install_composer
 
 #=================================================
 # MODIFY A CONFIG FILE
diff --git a/scripts/upgrade b/scripts/upgrade
index 41ea18d..c373be5 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -136,9 +136,15 @@ ynh_add_fpm_config
 #=================================================
 # SPECIFIC UPGRADE
 #=================================================
+# INSTALL AND INITIALIZE COMPOSER
+#=================================================
+ynh_script_progression --message="Installing composer..." --time --weight=1
+
+# Install composer
+ynh_install_composer
+
+ynh_exec_warn_less ynh_composer_exec --commands=\"dump-autoload\"
 
-( cd $final_path && sudo /usr/bin/php composer.phar install --no-dev --prefer-source )
-( cd $final_path && sudo /usr/bin/php composer.phar dump-autoload )
 ( cd $final_path && sudo /usr/bin/php artisan migrate -n )
 ( cd $final_path && sudo /usr/bin/php artisan config:clear -n )
 ( cd $final_path && sudo /usr/bin/php artisan config:cache -n )