DenoReleasedpatch

Deno 2.9.8 is out: highlights and upgrade guide

By VersionUpdates Editorial · Published Oct 21, 2026 · 2 min read

At a glance

Deno 2.9.8 is a patch release published on Oct 21, 2026. It follows Deno 2.9.7 by 34 days. It includes 13 listed changes.

This is a patch release, normally bug fixes only. It is usually safe to upgrade after your tests pass.

deno

deno upgrade --version 2.9.8

fix(compile): check read permission for dynamically imported local files (#36925)
fix(completions): complete script paths for bare deno run in zsh (#36976)
fix(core): keep op contexts alive until the isolate is disposed (#37026)
fix(coverage): skip the V8 code cache while collecting coverage (#36901)
fix(ext/fetch): bump hyper-util to 0.1.21 and hyper to 1.11.1 to cancel idle interval when pool empties (#36968)
fix(ext/napi): check napi_create_dataview bounds for overflow (#36962)
fix(ext/napi): ignore the callback return value while an exception is pending (#36942)
fix(ext/node): align X.509v1 certificate handling with OpenSSL (#36933)
fix(ext/node): mock.reset() restores mock.method() implementations (#36886)
fix(ext/node): support assert message functions and format arguments (#36944)
fix(npm): validate package link names (#37047)
fix(tls): distrust compromised eMudhra certificate authorities (#37046)
fix: bump rand 0.9.x to patched version

When was Deno 2.9.8 released?

Deno 2.9.8 was published on Oct 21, 2026.

Is Deno 2.9.8 a major update?

No. It is a patch release, mainly bug fixes.

How do I upgrade to Deno 2.9.8?

Use the commands in the “How to upgrade” section, then run your test suite.

Where are the official Deno 2.9.8 notes?

On the project's official release page: https://github.com/denoland/deno/releases/tag/v2.9.8