diff --git a/scripts/upgrade b/scripts/upgrade
index b5a8937..003e992 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -37,7 +37,7 @@ upgrade_type=$(ynh_check_app_version_changed)
 if [ "$database" == "sqlite" ]
 then
 	ynh_script_progression --message="Sqlite is not more supported by Kimai2..."
-	ynh_script_progression --message="Kimai2 will be upgrade to last available version : 1.13"
+	ynh_script_progression --message="Kimai2 will be upgraded to last available version : 1.13"
 	if ynh_compare_current_package_version --comparison ge --version 1.17.1~ynh1
 	then
     	ynh_script_progression --message="Kimai2 sqlite version is already to the last available version, no upgrade will be made"
@@ -116,6 +116,14 @@ then
 	ynh_setup_source --dest_dir="$final_path" --source_id="$database" --keep="config/packages/local.yaml var/invoices/ var/data/"
 fi
 
+if [ ynh_compare_current_package_version --comparison le --version 1.30.0~ynh1 ]
+then
+	ynh_script_progression --message="Doing a hard cache flush for major Kimai update from version 1.x to 2.x"
+	# https://www.kimai.org/documentation/updates.html
+	rm -r "$final_path/var/cache/*"
+	rm -r "$final_path/var/plugins/*"
+fi
+
 chmod 750 "$final_path"
 chmod -R o-rwx "$final_path"
 chown -R $app:www-data "$final_path"