--- title: sqlite-utils 4.0rc1 adds migrations and nested transactions description: sqlite-utils 4.0rc1 is the first release candidate for the major version of Simon Willison's Python library and CLI tool for SQLite. Two significant new... canonical: https://daily.dev/posts/sqlite-utils-4-0rc1-adds-migrations-and-nested-transactions-vffby2kab twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: sqlite-utils 4.0rc1 adds migrations and nested transactions | daily.dev og:description: sqlite-utils 4.0rc1 is the first release candidate for the major version of Simon Willison's Python library and CLI tool for SQLite. Two significant new... og:url: https://daily.dev/posts/sqlite-utils-4-0rc1-adds-migrations-and-nested-transactions-vffby2kab og:image: https://api.daily.dev/og/posts/vfFby2kab.png og:image:alt: sqlite-utils 4.0rc1 adds migrations and nested transactions og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # sqlite-utils 4.0rc1 adds migrations and nested transactions **[Simon Willison](https://daily.dev/sources/simonwillison)** · 5 min read · 0 upvotes · 0 comments ## Summary sqlite-utils 4.0rc1 is the first release candidate for the major version of Simon Willison's Python library and CLI tool for SQLite. Two significant new features are introduced: database migrations (ported from the sqlite-migrate package, supporting forward-only migrations defined as decorated Python functions) and nested transactions via a new db.atomic() context manager inspired by Django and Peewee. The release also includes several backwards-incompatible changes from earlier alphas, including updated upsert syntax using INSERT ... ON CONFLICT SET, dropped Python 3.8 support, changed default float column type from FLOAT to REAL, double-quoted identifiers in schemas, and type detection now enabled by default for CSV/TSV imports. The RC can be installed via pip or tested with uvx. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [sqlite-utils 4.0, now with database schema migrations](https://daily.dev/posts/sqlite-utils-4-0-now-with-database-schema-migrations-cco2twstz) · Simon Willison · 0 upvotes · 0 comments - [sqlite-utils 4.0rc2, mostly written by Claude Fable](https://daily.dev/posts/sqlite-utils-4-0rc2-mostly-written-by-claude-fable-ez8975ilm) · Simon Willison · 0 upvotes · 0 comments - [sqlite-utils 4.0a1 has several \(minor\) backwards incompatible changes](https://daily.dev/posts/sqlite-utils-4-0a1-has-several-minor-backwards-incompatible-changes-itttfhqzt) · Simon Willison · 0 upvotes · 0 comments --- Tags: [#python](https://daily.dev/tags/python), [#database](https://daily.dev/tags/database), [#sqlite](https://daily.dev/tags/sqlite) [View this post on daily.dev](https://daily.dev/posts/sqlite-utils-4-0rc1-adds-migrations-and-nested-transactions-vffby2kab) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"sqlite-utils 4.0rc1 adds migrations and nested transactions","url":"https://daily.dev/posts/sqlite-utils-4-0rc1-adds-migrations-and-nested-transactions-vffby2kab","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/sqlite-utils-4-0rc1-adds-migrations-and-nested-transactions-vffby2kab"},"datePublished":"2026-06-21T23:38:55.811Z","dateModified":"2026-06-21T23:39:14.660Z","description":"sqlite-utils 4.0rc1 is the first release candidate for the major version of Simon Willison's Python library and CLI tool for SQLite. 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