Releases — RATATOSK

Backstagev1.51.1CI/CD & App DeliveryMay 29, 2026

Backstage v1.51.1 is a maintenance release focused on corrected defects and package dependency behavior. The available release information indicates fixes in query handling, GitLab repository retrieval, runtime dependency classification, and Microsoft Graph group-member filtering.

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Backstagev1.51.0CI/CD & App DeliveryMay 19, 2026

ACTION 2CHECK 9PLAN 4OTHER 61View full analysis

A broad release with breaking API removals, changed defaults and constraints, and many new operator-facing capabilities. It also includes performance improvements and an explicitly described dependency security update.

Action needed (2)

securityModule Federation packages at v2.3.3
Module Federation packages were upgraded to v2.3.3 to address known vulnerabilities.
breakingThe @remixicon/react version constraint
The @remixicon/react dependency is limited to versions below 4.9.0 because of a license change.

Check if affected (9)

securitySpecific defaults for known MCP clients
Applies if you configure CIMD or DCR.
The previous permissive ['*'] wildcards were replaced with specific defaults for known MCP clients.
breakingThe NavItemBlueprint API, removed
Applies if you use NavItemBlueprint.
The deprecated NavItemBlueprint was removed from @backstage/frontend-plugin-api.
breakingSidebar and legacy nav-item rendering in renderInTestApp
Applies if you use renderInTestApp.
renderInTestApp from @backstage/frontend-test-utils no longer renders a sidebar or legacy nav-item extensions.
+ 6 more on the release page

Plan ahead (4)

deprecatedThe PolicyQueryUser.identity field, deprecated
Applies if you use PolicyQueryUser.identity.
The PolicyQueryUser.identity field has been deprecated.
deprecatedThe EXPERIMENTAL_formDecorators field, deprecated alias
Applies if you configure EXPERIMENTAL_formDecorators.
The previous EXPERIMENTAL_formDecorators field continues to work as a deprecated alias.
deprecatedThe catalog.stitchingStrategy.mode: 'immediate' setting, deprecated
Applies if you configure catalog.stitchingStrategy.mode.
The catalog.stitchingStrategy.mode: 'immediate' setting has been deprecated.
+ 1 more on the release page

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