diff --git a/scripts/install b/scripts/install
index e799ba9..323905a 100644
--- a/scripts/install
+++ b/scripts/install
@@ -177,14 +177,14 @@ ynh_mysql_connect_as --user=$app --password="$db_pwd" --database=$db_name < ../c
 case $language in
   fr)
     ynh_script_progression --message="Installing French extension..." --weight=2
-    ynh_exec_warn_less ynh_composer_exec --user=$app --phpversion=$phpversion --workdir=$final_path --commands=\"require qiaeru/lang-french\"
+    ynh_exec_warn_less ynh_composer_exec --phpversion=$phpversion --workdir=$final_path --commands=\"require qiaeru/lang-french\"
     activate_flarum_extension $db_name "qiaeru-lang-french"
     sql_command="UPDATE \`settings\` SET \`value\` = 'fr' WHERE \`settings\`.\`key\` = 'default_locale'"
     ynh_mysql_execute_as_root --sql="$sql_command" --database=$db_name
     ;;
   de)
     ynh_script_progression --message="Installing German extension..." --weight=2
-    ynh_exec_warn_less ynh_composer_exec --user=$app --phpversion=$phpversion --workdir=$final_path --commands=\"require cbmainz/flarum-de\"
+    ynh_exec_warn_less ynh_composer_exec --phpversion=$phpversion --workdir=$final_path --commands=\"require cbmainz/flarum-de\"
     activate_flarum_extension $db_name "cbmainz-de"
     sql_command="UPDATE \`settings\` SET \`value\` = 'de' WHERE \`settings\`.\`key\` = 'default_locale'"
     ynh_mysql_execute_as_root --sql="$sql_command" --database=$db_name
diff --git a/scripts/upgrade b/scripts/upgrade
index 1f14995..7a8f24e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -73,7 +73,7 @@ fi
 # Remove SSOwat if it exists
 ssowat_extension=$(ynh_app_setting_get --app=$app --key=ssowat_extension)
 if [ ! -z "$ssowat_extension" ]; then
-	ynh_exec_warn_less ynh_composer_exec --user=$app --phpversion=$phpversion --workdir=$final_path --commands=\"remove tituspijean/flarum-ext-auth-ssowat\"
+	ynh_exec_warn_less ynh_composer_exec --phpversion=$phpversion --workdir=$final_path --commands=\"remove tituspijean/flarum-ext-auth-ssowat\"
 	ynh_app_setting_delete --app=$app --key=ssowat_extension
 fi
 
@@ -181,13 +181,13 @@ then
 	chown -R $app:www-data $final_path
 
 	# Install Composer and Flarum
-	ynh_exec_warn_less ynh_install_composer --user=$app --phpversion=$phpversion --workdir=$final_path
+	ynh_exec_warn_less ynh_install_composer --phpversion=$phpversion --workdir=$final_path
 
 	# Perform migrations and clear cache
 	pushd $final_path
 		ynh_script_progression --message="Upgrading Flarum and its extensions..." --weight=1
-		ynh_exec_warn_less ynh_composer_exec --user=$app --phpversion=$phpversion --workdir=$final_path --commands=\"require tituspijean/flarum-ext-auth-ldap:$ldap_version --no-update\"
-		ynh_exec_warn_less ynh_composer_exec --user=$app --phpversion=$phpversion --workdir=$final_path --commands=\"require flarum/core:$core_version --prefer-dist --update-no-dev -a --update-with-all-dependencies\"
+		ynh_exec_warn_less ynh_composer_exec --phpversion=$phpversion --workdir=$final_path --commands=\"require tituspijean/flarum-ext-auth-ldap:$ldap_version --no-update\"
+		ynh_exec_warn_less ynh_composer_exec --phpversion=$phpversion --workdir=$final_path --commands=\"require flarum/core:$core_version --prefer-dist --update-no-dev -a --update-with-all-dependencies\"
 		exec_as $app php$phpversion flarum migrate
 		exec_as $app php$phpversion flarum cache:clear
 	popd
@@ -209,14 +209,14 @@ fi
 case $language in
   fr)
     ynh_script_progression --message="Installing French extension..." --weight=2
-    ynh_exec_warn_less ynh_composer_exec --user=$app --phpversion=$phpversion --workdir=$final_path --commands=\"require qiaeru/lang-french\"
+    ynh_exec_warn_less ynh_composer_exec --phpversion=$phpversion --workdir=$final_path --commands=\"require qiaeru/lang-french\"
     activate_flarum_extension $db_name "qiaeru-lang-french"
     sql_command="UPDATE \`settings\` SET \`value\` = 'fr' WHERE \`settings\`.\`key\` = 'default_locale'"
     ynh_mysql_execute_as_root "$sql_command" $db_name
     ;;
   de)
     ynh_script_progression --message="Installing German extension..." --weight=2
-    ynh_exec_warn_less ynh_composer_exec --user=$app --phpversion=$phpversion --workdir=$final_path --commands=\"require cbmainz/flarum-de\"
+    ynh_exec_warn_less ynh_composer_exec --phpversion=$phpversion --workdir=$final_path --commands=\"require cbmainz/flarum-de\"
     activate_flarum_extension $db_name "cbmainz-de"
     sql_command="UPDATE \`settings\` SET \`value\` = 'de' WHERE \`settings\`.\`key\` = 'default_locale'"
     ynh_mysql_execute_as_root "$sql_command" $db_name