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<p>Langflow and LFX are versioned together on the same <code>major.minor</code> line, so you can always tell which LFX release runs which flows.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="compatibility-contract">Compatibility contract<a href="#compatibility-contract" class="hash-link" aria-label="Direct link to Compatibility contract" title="Direct link to Compatibility contract" translate="no">​</a></h2>
<p><strong>LFX <code>X.Y.N</code> is guaranteed compatible with any flow exported from Langflow <code>X.Y.M</code>.</strong></p>
<p>The major and minor numbers must match.
The patches <code>.N</code> for LFX and <code>.M</code> for Langflow are released independently. An LFX patch fix does not require a Langflow patch release, and vice versa.</p>
<p>When LFX and a flow share the same <code>major</code> version but differ on <code>minor</code>, such as a flow exported from Langflow 1.9.x run with LFX 1.10.x, individual components may have been updated since the flow was saved.
Use <code>lfx upgrade</code> to check compatibility and apply safe automatic fixes before running or serving such a flow.
For more information, see <a href="#check-and-upgrade-flows-with-lfx-upgrade" class="">Check and upgrade flows with lfx upgrade</a>.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="compatibility-matrix">Compatibility matrix<a href="#compatibility-matrix" class="hash-link" aria-label="Direct link to Compatibility matrix" title="Direct link to Compatibility matrix" translate="no">​</a></h2>
<table><thead><tr><th>Langflow version</th><th>Compatible LFX version</th><th>Notes</th></tr></thead><tbody><tr><td>1.10.x</td><td>1.10.x</td><td>Fully compatible. Same <code>major.minor</code> line.</td></tr><tr><td>1.11.x</td><td>1.11.x</td><td>Fully compatible. Same <code>major.minor</code> line.</td></tr><tr><td>1.9.x or earlier</td><td>1.10.x</td><td>Use <code>lfx upgrade --upgrade-flow=safe</code> to apply safe component schema upgrades before running.</td></tr><tr><td>Any 1.x.x</td><td>0.5.x</td><td>LFX 0.5.x was a standalone release before version alignment. It is no longer compatible with Langflow 1.10+ flows.</td></tr></tbody></table>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="check-and-upgrade-flows-with-lfx-upgrade">Check and upgrade flows with <code>lfx upgrade</code><a href="#check-and-upgrade-flows-with-lfx-upgrade" class="hash-link" aria-label="Direct link to check-and-upgrade-flows-with-lfx-upgrade" title="Direct link to check-and-upgrade-flows-with-lfx-upgrade" translate="no">​</a></h2>
<p>The <code>lfx upgrade</code> command inspects a flow against the built-in component registry and reports any components that have become incompatible or that have safe automatic upgrades available.</p>
<p><code>lfx upgrade</code> compares each component in the flow against a bundled index at <code>_assets/component_index.json</code> that ships with the LFX release.</p>
<p>Run it with no flags to get a read-only compatibility report. The command reads your flow JSON, walks through every component node, and prints one line per node with its status. It does not modify the file.</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx upgrade my-flow.json</span></div></div><br></code></div></div>
<p>Example output:</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> [SAFE] Agent (AgentComponent) - id: abc123</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> [OK] Chat Output (ChatOutput) - id: def456</span></div></div><br></code></div></div>
<table><thead><tr><th>CLI output</th><th>What it means</th><th>Example</th></tr></thead><tbody><tr><td><code>[OK]</code></td><td>Component matches the current registry.</td><td>No action needed.</td></tr><tr><td><code>[SAFE]</code></td><td>Component code changed, but ports and fields your flow uses still line up. <code>lfx upgrade --write</code> can apply this update automatically.</td><td>An output that previously emitted only <code>Message</code> now also supports <code>Data</code>.</td></tr><tr><td><code>[BREAKING]</code></td><td>A port or field your flow relies on was removed.</td><td>An input that accepted <code>Message</code> and <code>Data</code> now accepts only <code>Message</code> and your flow uses a <code>Data</code> component.</td></tr><tr><td><code>[BLOCKED]</code></td><td>The component type no longer exists in this LFX build.</td><td>A bundle-only component is not installed in your environment.</td></tr></tbody></table>
<p>To apply fixes or enforce stricter checks, run:</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span># Apply all safe upgrades and overwrite the file</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx upgrade my-flow.json --write</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span># Fail if any safe upgrades are still pending (use after a dry run before running `--write`)</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx upgrade my-flow.json --strict</span></div></div><br></code></div></div>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="inline-compatibility-checking-with---upgrade-flow">Inline compatibility checking with <code>--upgrade-flow</code><a href="#inline-compatibility-checking-with---upgrade-flow" class="hash-link" aria-label="Direct link to inline-compatibility-checking-with---upgrade-flow" title="Direct link to inline-compatibility-checking-with---upgrade-flow" translate="no">​</a></h2>
<p>Both <code>lfx run</code> and <code>lfx serve</code> accept an <code>--upgrade-flow</code> option so you can apply compatibility checks at execution without a separate <code>lfx upgrade</code> step.</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span># Check only — fail if any component is blocked</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx run my-flow.json --upgrade-flow=check &quot;Hello world&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span># Apply safe upgrades in memory, then run</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx run my-flow.json --upgrade-flow=safe &quot;Hello world&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span># Same options for serve</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx serve my-flow.json --upgrade-flow=safe</span></div></div><br></code></div></div>
<table><thead><tr><th>Mode</th><th>Behavior</th></tr></thead><tbody><tr><td><code>check</code></td><td>Reports compatibility issues and exits non-zero if any component is blocked. No changes are written to disk.</td></tr><tr><td><code>safe</code></td><td>Applies all safe upgrades in memory, then runs or serves the flow. Blocked components still cause a non-zero exit.</td></tr></tbody></table>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="pin-versions">Pin versions<a href="#pin-versions" class="hash-link" aria-label="Direct link to Pin versions" title="Direct link to Pin versions" translate="no">​</a></h2>
<p>Pin <code>lfx~=1.10.0</code> in <code>requirements.txt</code> to track all patch releases for a given Langflow minor without crossing into the next minor automatically.</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span># requirements.txt — allows 1.10.1, 1.10.2, … but not 1.11.0</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx~=1.10.0</span></div></div><br></code></div></div>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="migrating-from-lfx-05x-to-1100">Migrating from LFX 0.5.x to 1.10.0<a href="#migrating-from-lfx-05x-to-1100" class="hash-link" aria-label="Direct link to Migrating from LFX 0.5.x to 1.10.0" title="Direct link to Migrating from LFX 0.5.x to 1.10.0" translate="no">​</a></h2>
<p>LFX was realigned from its standalone <code>0.5.x</code> line onto Langflow&#x27;s <code>major.minor</code> line, so the version number jumps from <code>0.5.0</code> to <code>1.10.0</code> in one release. This is a version-numbering change, not 95 minor releases of new features.</p>
<p>This jump can affect existing dependency pins in unexpected ways:</p>
<table><thead><tr><th>Pin style</th><th>Effect</th></tr></thead><tbody><tr><td><code>lfx==0.5.x</code> or <code>lfx&lt;1.0</code></td><td>Does not upgrade. The deployment stays on 0.5.x.</td></tr><tr><td><code>lfx&gt;=0.5,&lt;1</code></td><td>Does not upgrade. The upper bound excludes 1.10.0.</td></tr><tr><td><code>lfx&gt;=0.5</code> (no upper bound)</td><td>Upgrades automatically to 1.10.0 on the next install.</td></tr></tbody></table>
<p>Going forward, pin with <code>lfx~=1.10.0</code> so you receive compatible patches without silently crossing minor lines.</p></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/deployment-multi-worker"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Deploy Langflow with multiple workers</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/deployment-block-custom-components"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Block custom components</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="#compatibility-contract" class="table-of-contents__link toc-highlight">Compatibility contract</a></li><li><a href="#compatibility-matrix" class="table-of-contents__link toc-highlight">Compatibility matrix</a></li><li><a href="#check-and-upgrade-flows-with-lfx-upgrade" class="table-of-contents__link toc-highlight">Check and upgrade flows with <code>lfx upgrade</code></a></li><li><a href="#inline-compatibility-checking-with---upgrade-flow" class="table-of-contents__link toc-highlight">Inline compatibility checking with <code>--upgrade-flow</code></a></li><li><a href="#pin-versions" class="table-of-contents__link toc-highlight">Pin versions</a></li><li><a href="#migrating-from-lfx-05x-to-1100" class="table-of-contents__link toc-highlight">Migrating from LFX 0.5.x to 1.10.0</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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