diff --git a/manifest.json b/manifest.json
index be8caa4..a04a82a 100644
--- a/manifest.json
+++ b/manifest.json
@@ -15,7 +15,7 @@
         "url": "http://example.com"
     },
     "requirements": {
-        "yunohost": ">= 3.5"
+        "yunohost": ">= 4.1.3"
     },
     "multi_instance": true,
     "services": [
diff --git a/scripts/install b/scripts/install
index 81bcbf6..5978825 100755
--- a/scripts/install
+++ b/scripts/install
@@ -72,7 +72,6 @@ ynh_script_progression --message="Storing installation settings..." --time --wei
 ynh_app_setting_set --app=$app --key=domain --value=$domain
 ynh_app_setting_set --app=$app --key=path --value=$path_url
 ynh_app_setting_set --app=$app --key=admin --value=$admin
-ynh_app_setting_set --app=$app --key=is_public --value=$is_public
 ynh_app_setting_set --app=$app --key=language --value=$language
 
 #=================================================
@@ -222,7 +221,8 @@ chown -R $app: $final_path
 
 # Set the app as temporarily public for curl call
 ynh_script_progression --message="Configuring SSOwat..." --time --weight=1
-ynh_app_setting_set --app=$app --key=skipped_uris --value="/"
+# Making the app public for curl
+ynh_permission_update --permission="main" --add="visitors"
 # Reload SSOwat config
 yunohost app ssowatconf
 
@@ -234,10 +234,7 @@ ynh_script_progression --message="Finalizing installation..." --time --weight=1
 ynh_local_curl "/INSTALL_PATH" "key1=value1" "key2=value2" "key3=value3"
 
 # Remove the public access
-if [ $is_public -eq 0 ]
-then
-	ynh_app_setting_delete --app=$app --key=skipped_uris
-fi
+ynh_permission_update --permission="main" --remove="visitors"
 
 #=================================================
 # MODIFY A CONFIG FILE
@@ -347,15 +344,24 @@ ynh_add_fail2ban_config --logpath="/var/log/nginx/${domain}-error.log" --failreg
 #=================================================
 # SETUP SSOWAT
 #=================================================
-ynh_script_progression --message="Configuring SSOwat..." --time --weight=1
+ynh_script_progression --message="Configuring permissions..." --time --weight=1
 
 # Make app public if necessary
 if [ $is_public -eq 1 ]
 then
-	# unprotected_uris allows SSO credentials to be passed anyway.
-	ynh_app_setting_set --app=$app --key=unprotected_uris --value="/"
+	# Everyone can access the app.
+	# The "main" permission is automatically created before the install script.
+	ynh_permission_update --permission="main" --add="visitors"
 fi
 
+# Only the admin can access the admin panel of the app (if the app has an admin panel)
+ynh_permission_create --permission="admin" --url="/admin" --allowed=$admin
+
+# Everyone can access to the api part
+# We don't want to display the tile in the sso so we put --show_tile="false"
+# And we don't want that the YunoHost Admin can remove visitors group to this permission, so we put --protected="true"
+ynh_permission_create --permission="api" --url "/api" --allowed="visitors" --show_tile="false" --protected="true"
+
 #=================================================
 # RELOAD NGINX
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 6e61d9f..fff0363 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -19,7 +19,6 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
 admin=$(ynh_app_setting_get --app=$app --key=admin)
-is_public=$(ynh_app_setting_get --app=$app --key=is_public)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 language=$(ynh_app_setting_get --app=$app --key=language)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
@@ -59,6 +58,26 @@ ynh_script_progression --message="Ensuring downward compatibility..." --time --w
 #	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 #fi
 
+### If nobody installed your app before 4.1,
+### then you may safely remove these lines
+
+# Cleaning legacy permissions
+if ynh_legacy_permissions_exists; then
+	ynh_legacy_permissions_delete_all
+
+	ynh_app_setting_delete --app=$app --key=is_public
+fi
+
+if ! ynh_permission_exists --permission="admin"; then
+	# Create the required permissions
+	ynh_permission_create --permission="admin" --url="/admin" --allowed=$admin
+fi
+
+# Create a permission if needed
+if ! ynh_permission_exists --permission="api"; then
+	ynh_permission_create --permission="api" --url "/api" --allowed="visitors" --show_tile="false" --protected="true"
+fi
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -191,18 +210,6 @@ ynh_script_progression --message="Reconfiguring Fail2Ban..." --time --weight=1
 # Create a dedicated Fail2Ban config
 ynh_add_fail2ban_config --logpath="/var/log/nginx/${domain}-error.log" --failregex="Regex to match into the log for a failed login"
 
-#=================================================
-# SETUP SSOWAT
-#=================================================
-ynh_script_progression --message="Upgrading SSOwat configuration..." --time --weight=1
-
-# Make app public if necessary
-if [ $is_public -eq 1 ]
-then
-	# unprotected_uris allows SSO credentials to be passed anyway
-	ynh_app_setting_set --app=$app --key=unprotected_uris --value="/"
-fi
-
 #=================================================
 # RELOAD NGINX
 #=================================================