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11Contribute</a></li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Roadmap</span><meta itemprop="position" content="1"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Roadmap</h1></header><p>This roadmap is a living document representing projected timelines for WASI releases. Goals and projections are provisional and subject to revision.</p>
12<h2 class="anchor anchorWithStickyNavbar_LWe7" id="wasi-releases">WASI releases<a href="#wasi-releases" class="hash-link" aria-label="Direct link to WASI releases" title="Direct link to WASI releases">​</a></h2>
13<p>WASI patch releases follow a <strong>release train model</strong>: a regular cadence in which releases are published regardless of the enhancements and fixes that are &quot;ready for the train.&quot; Patch releases include smaller features and bug fixes. Larger features and breaking changes are reserved for milestone releases such as 0.3.0.</p>
14<p>WASI 0.3 patch releases ship every two months, on the second Tuesday. WASI 0.2.1 through 0.2.12 shipped on the same cadence.</p>
15<p>WASI 0.3.0 was an exception to the release train, shipping on June 11, 2026 following a WASI Subgroup vote. WASI 1.0 may also be scheduled outside the train. The cadence after 1.0 is undetermined.</p>
16<h3 class="anchor anchorWithStickyNavbar_LWe7" id="release-schedule">Release schedule<a href="#release-schedule" class="hash-link" aria-label="Direct link to Release schedule" title="Direct link to Release schedule">​</a></h3>
17<table><thead><tr><th>Release</th><th>Date</th><th>Status</th></tr></thead><tbody><tr><td>WASI 0.3.0</td><td>June 11, 2026</td><td>Shipped, outside the train</td></tr><tr><td>WASI 0.3.1</td><td>August 11, 2026</td><td>Shipped</td></tr><tr><td>WASI 0.3.2</td><td>October 13, 2026</td><td>Planned</td></tr><tr><td>WASI 0.3.3</td><td>December 8, 2026</td><td>Planned</td></tr><tr><td>WASI 0.3.4</td><td>February 9, 2027</td><td>Planned</td></tr><tr><td>WASI 0.3.5</td><td>April 13, 2027</td><td>Planned</td></tr><tr><td>WASI 0.3.6</td><td>June 8, 2027</td><td>Planned</td></tr><tr><td>WASI 0.3.7</td><td>August 10, 2027</td><td>Planned</td></tr><tr><td>WASI 0.3.8</td><td>October 12, 2027</td><td>Planned</td></tr><tr><td>WASI 0.3.9</td><td>December 14, 2027</td><td>Planned</td></tr></tbody></table>
18<p>Releases are cut by a WASI Subgroup co-chair through an automated GitHub Actions workflow. For the full process, see <a href="https://github.com/WebAssembly/WASI/blob/main/docs/Release.md" target="_blank" rel="noopener noreferrer">Release</a> in the WASI repository.</p>
19<h2 class="anchor anchorWithStickyNavbar_LWe7" id="wasi-03">WASI 0.3<a href="#wasi-03" class="hash-link" aria-label="Direct link to WASI 0.3" title="Direct link to WASI 0.3">​</a></h2>
20<p>WASI 0.3 support is available in <a href="https://wasmtime.dev/" target="_blank" rel="noopener noreferrer">Wasmtime</a> 46 and later, which enables WASI 0.3 by default, and in <a href="https://github.com/bytecodealliance/jco" target="_blank" rel="noopener noreferrer">jco</a>.</p>
21<p>WASI 0.3 adds <strong>native async support</strong> to the Component Model and refactors WASI 0.2 interfaces to take advantage of native async primitives: <code>async func</code>, <code>stream&lt;T&gt;</code>, and <code>future&lt;T&gt;</code>. The <code>wasi:io</code> package is removed entirely, with its functionality absorbed into the Component Model&#x27;s Canonical ABI. For a full overview of changes, see <a href="/releases/wasi-p3">WASI 0.3</a>.</p>
22<p>
22Implementations may continue to support WASI 0.2 alongside 0.3, either by implementing both versions or by virtualizing (polyfilling) 0.2 in terms of 0.3.</p>
23<p>Following WASI 0.3.0, incremental and backwards-compatible 0.3.x releases ship on the release train. WASI 0.3.1 adopted the Component Model <code>map&lt;K, V&gt;</code> type and the <code>implements</code> and <code>external-id</code> annotations, which WASI interfaces may use from that release onward.</p>
24<p>Later releases may adopt further Component Model features. Candidates are developed behind <a href="https://github.com/WebAssembly/component-model/blob/main/design/mvp/Explainer.md#gated-features" target="_blank" rel="noopener noreferrer">gated features</a> and reach a WASI release only after a Subgroup vote, as described in <a href="/releases#component-model-features">Component Model features</a>. Current candidates include threading built-ins, stackful async lift, fixed-length lists, the <code>error-context</code> type, and canonical interface names.</p>
25<h2 class="anchor anchorWithStickyNavbar_LWe7" id="project-timeline">Project timeline<a href="#project-timeline" class="hash-link" aria-label="Direct link to Project timeline" title="Direct link to Project timeline">​</a></h2>
26<p><img decoding="async" loading="lazy" alt="Timeline of WASI releases. WASI 0.2.0 shipped in January 2024, followed by twelve patch releases every two months through 0.2.12. WASI 0.3.0 shipped two and a half years later, in June 2026, followed by 0.3.1 in August 2026. Further 0.3.x patch releases are planned every two months through 2027." src="data:image/svg+xml;base64,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" width="1200" height="252" class="img_ev3q"></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/bytecodealliance/wasi.dev/tree/main/docs/roadmap.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/security"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Security</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/resources"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Resources</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#wasi-releases" class="table-of-contents__link toc-highlight">WASI releases</a><ul><li><a href="#release-schedule" class="table-of-contents__link toc-highlight">Release schedule</a></li></ul></li><li><a href="#wasi-03" class="table-of-contents__link toc-highlight">WASI 0.3</a></li><li><a href="#project-timeline" class="table-of-contents__link toc-highlight">Project timeline</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Docs</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/">Introduction</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://bytecodealliance.zulipchat.com/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Zulip<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU">
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Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.