New Bug-Fix Releases for MPS Versions 2026.2 RC2, 2026.1.2, 2025.3.3, 2025.2.5, and 2025.1.5
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We’ve released updates for multiple MPS versions that fix a critical security issue. MPS 2026.1.2 and 2026.2 RC2 additionally bring a substantial improvement to the Projectional Agent Toolkit plugin.
For the latest information on the security issue and the steps we’ve taken to address it, please read our dedicated blog post – Compromised eMudhra Certificates: Update Your JetBrains IDEs.
One important fix required on your end if you are on 2025.1.5 or 2025.2.5: Disable JCEF by turning off the ide.browser.jcef.enabled flag in the MPS Registry. Read detailed instructions in the Disable JCEF in your IDE section of the announcement.
As JBR and JCEF are affected by the security problem, this is likely to affect MPS-based RCP applications. If you build and distribute RCP applications, please read the above-mentioned post and perform all necessary actions to secure your RCP applications properly.
MPS 2026.1.2 and 2026.2 RC2
The Projectional Agent Toolkit plugin receives all the improvements that are planned for MPS 2026.2, including:
- Consolidated MCP tool API
- Numerous performance improvements
- Type system MCP tool
- Intention actions and quick-fixes
- Automatic skill database updates
- Access to the content of MPS logs
- Opening, closing, and creating MPS projects
- Automatic correction of SModel expressions in parsed Java statements
- And many more
Note: Remember to ask your agent to update the MPS skills in your project to reap the full benefits of these changes.
Download MPS 2026.1.2 here.
See the full list of fixed issues here.
Download MPS 2026.2 RC2 here.
See the full list of fixed issues here.
The 2025 versions only include the security fix.
MPS 2025.3.3
Download MPS 2025.3.3 here.
See the full list of fixed issues here.
MPS 2025.2.5
Download MPS 2025.2.5 here.
See the full list of fixed issues here.
MPS 2025.1.5
Download MPS 2025.1.5 here.
See the full list of fixed issues here.
Your JetBrains MPS team