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Where Odoo 15 Leaves You in 2026

Odoo 15 was released in October 2021 and its standard support ended in 2024. It gets no bug fixes or security patches, and most current third-party apps and connectors are built for recent versions only.

Odoo 18, released in October 2024, is supported until September 2027 (planned). Three releases sit between the two, bringing changes such as attrs and states leaving the views, analytic accounting being rebuilt, and tree views becoming list views.

Odoo 15 Support ended
Odoo 18 Supported until Sep 2027
Released
October 2021
October 2024
Standard support
Ended in 2024
Until September 2027 (planned)
Bug and security fixes
No
Yes
Field rules in views
attrs and states
Python expressions
Analytic accounting
Analytic accounts and tags
Analytic plans and distributions
List view tag
<tree>
<list>

Three Releases Between Odoo 15 and Odoo 18

Your data passes through each of these releases on the way to Odoo 18. Here is what each one changes for custom modules, in order. We check every item against your database during the audit.

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  1. October 2022

    Odoo 16: Analytic Accounting Is Rebuilt

    • Analytic accounting moves to analytic plans and distributions, which changes how cost tracking data is stored.
    • Reports, QWeb templates, and website pages move from Bootstrap 4 to Bootstrap 5.
    • fields_view_get is replaced by get_view, and the old flush and cache methods are replaced by granular ones.
  2. November 2023

    Odoo 17: attrs and states Leave the Views

    • Every conditional field rule written with attrs or states becomes a Python expression.
    • name_get is replaced by _compute_display_name, which affects how custom records show their names.
    • Install and uninstall hooks now receive env, and settings screens use new app, block, and setting tags.
  3. October 2024

    Odoo 18: Tree Views Become List Views

    • Tree views are renamed list views, including the tree_view_ref context key.
    • user_has_groups, check_access_rights, and check_access_rule give way to has_group and check_access.
    • Chatter and kanban markup change, with a single chatter tag and card templates for kanban views.

The OCA migration guides for Odoo 16 to 18 and Odoo's supported versions page.

How We Move Odoo 15 to Odoo 18

Five steps, each with a clear output, so you always know where the project stands.

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Audit

We list your apps, custom modules, third-party apps, and integrations on Odoo 15, then mark each one to upgrade, rebuild, or remove. You get a written scope and a fixed quote.

Test Upgrade

A copy of your database is upgraded through Odoo 16 to 18 while production keeps running. Every error is logged and fixed.

Port Custom Modules

Each module is rewritten for the Odoo 18 framework, including attrs and states leaving the views, analytic accounting being rebuilt, and tree views becoming list views.

Reconcile and Test

We compare trial balance, receivables and payables, stock valuation, and open documents with Odoo 15. Your key users then test their daily work on staging.

Rehearse and Go Live

A timed dry run sets the cutover window. Go-live happens off-hours, with a rollback plan and our team on hand afterwards.

Upgrade to Odoo 18 Now, or Wait?

A three-release upgrade is usually the cheapest it will ever be, because each release you skip adds work later. Here is how to decide on timing.

Upgrading now makes sense when

  • Odoo 15 no longer gets security fixes.
  • You need features or apps that only exist in Odoo 18.
  • Your custom modules are few and actively maintained.
  • Third-party apps you rely on already have Odoo 18 releases.

Waiting a little can make sense when

  • A third-party app you rely on has no Odoo 18 release yet.
  • You are in peak season and cannot spare key users for testing.
  • You would rather go straight to Odoo 20 once your apps support it.

On Odoo Enterprise

Odoo's upgrade service converts the standard apps and data of your database. Modules built in-house or by third parties are not covered unless they are under a maintenance of customizations subscription, so they still need porting and testing.

On Odoo Community

The OCA's open-source OpenUpgrade project migrates one version at a time, so Odoo 15 to 18 means three consecutive runs. Coverage differs by app and release, so we check each one before planning.

Other Paths to Odoo 18

On a different version? Each path shows its own route, hop count, and complexity.

  1. 17
  2. 18
  • Complexity: Low
  • Odoo 17: standard support ended
  1. 16
  2. 17
  3. 18
  • Complexity: Medium
  • Odoo 16: standard support ended
Client Success Stories

Odoo Projects We Have Delivered

How our team handled Odoo projects where a failed change would have stopped daily operations.

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Odoo + WhatsApp Automation with n8n Streamlined Furniture Retail Operations in Mauritius

Odoo + WhatsApp Automation with n8n Streamlined Furniture Retail Operations in Mauritius

See how Techvoot integrated Odoo ERP and n8n to automate delivery scheduling, driver assignment, proof of delivery and customer support for a Mauritius furniture retailer.

Category: ERP, Automation
Discover the Full Story

How Odoo ERP Transformed Operations for our UAE-Based Client's Oxy-Hydrogen Equipment Company

How Odoo ERP Transformed Operations for our UAE-Based Client's Oxy-Hydrogen Equipment Company

A UAE-based oxy-hydrogen equipment company partnered with Techvoot Solutions to implement a customized Odoo ERP platform that unified manufacturing, inventory, procurement, sales, and finance operations. The solution improved operational visibility, streamlined workflows, and enabled faster business decision-making through centralized ERP management.

Category: ERP
Discover the Full Story

Manufacturing Efficiency Boosted by 35% with Odoo ERP

Manufacturing Efficiency Boosted by 35% with Odoo ERP

A manufacturing company achieved 35% improved operational efficiency with Techvoot’s Odoo ERP implementation, enabling integrated production, inventory, finance, HR, and logistics management on a single platform.

Category: ERP
Discover the Full Story

Odoo 15 to Odoo 18 Upgrade Questions

Still unsure about your database?

Can I upgrade Odoo 15 directly to Odoo 18?

Yes, in one project with one go-live. The database still passes through every release in between, Odoo 16 and 17, and each custom module has to absorb the framework changes from all three releases. We run the whole route on a copy first, so production only moves once.

Is Odoo 15 still supported?

No. Odoo 15 was released in October 2021 and its standard support ended in 2024, so it gets no bug fixes or security updates. Odoo 18 is supported until September 2027 (planned).

How long does an Odoo 15 to Odoo 18 upgrade take?

It depends mostly on how many custom modules and integrations you have, and how much data you hold. With three releases to cross, custom code is the biggest part of the work. The free audit gives you a written timeline before any work starts.

What breaks most often when upgrading from Odoo 15 to Odoo 18?

Custom code, not standard data. The biggest changes on this path are attrs and states leaving the views in Odoo 17, analytic accounting being rebuilt in Odoo 16, and tree views becoming list views in Odoo 18.

Should we upgrade to Odoo 18 now or wait?

Odoo 15 no longer gets security fixes, so waiting adds risk. Plan it for a quieter period, once the third-party apps you rely on have Odoo 18 releases.

Will we keep our historical data?

Yes. An upgrade keeps your full history, including posted invoices, stock moves, and old documents. If some apps are rebuilt instead, we migrate master data and open balances, and the old database stays available read-only for reference.

Can we upgrade Odoo 15 Community to Odoo 18?

Yes. On Community, the open-source OpenUpgrade project migrates one version at a time, so this path means three consecutive runs. Coverage differs by app and release, so we check each one before planning, and port or rebuild where scripts are missing.