Symfony Releases

Symfony releases land on a predictable schedule, but the signal-to-noise ratio in release notes is low. This series distills each version to what actually changed the way you write Symfony applications.

Symfony 8.0: PHP 8.4 minimum, native lazy objects, and FormFlow

Symfony 8.0 shipped November 27, 2025, same day as 7.4. It requires PHP 8.4 and drops everything that was deprecated in 7.4. The two most interesting changes are what it stops doing and what it starts doing with PHP 8.4. Native lazy objects Symfony’s proxy system, used for lazy service initialization and Doctrine’s entity proxies, has historically relied on code generation. The proxy classes were generated at cache warmup, stored as files, and loaded when needed. It worked, but it added real complexity: generated files to manage, cache to invalidate, code that looked nothing like the class it proxied. ...

Symfony 7.4 LTS: message signing, PHP config arrays, and the last 7.x

Symfony 7.4 landed November 2025, alongside 8.0. It’s the last LTS of the 7.x line: PHP 8.2 minimum, three years of bug fixes, four of security. For teams that can’t or won’t follow 8.0’s PHP 8.4 requirement, 7.4 is where you land. Message signing in Messenger Transport security in Messenger has always been the application’s problem to solve. 7.4 adds message signing: a stamp-based mechanism that signs dispatched messages and validates signatures on reception. ...

Symfony 7.0: PHP 8.2 minimum and annotations finally gone

Symfony 7.0 landed November 29, 2023, same day as 6.4. The pattern holds: the X.0 release cuts deprecated code and raises the PHP floor. 7.0 requires PHP 8.2 and removes everything that 6.4 flagged as deprecated. The most visible removal: Doctrine annotations. @Route, @ORM\Column, @Assert - gone. Native PHP attributes have been the recommended approach since Symfony 5.2. 7.0 just makes it official. Attributes everywhere The migration from annotations to attributes is mostly mechanical: syntax changes from @ to #[], and the class references move from Doctrine annotation classes to PHP attribute classes: ...

Symfony 6.4 LTS: AssetMapper, Scheduler, Webhook, and the long-term release

Symfony 6.4 landed November 29, 2023. It’s an LTS with a story: four components that shipped as experimental in earlier releases are now stable. The biggest deal is AssetMapper. AssetMapper Modern frontend tooling in Symfony meant Webpack Encore. Encore works: it handles transpilation, bundling, versioning, hot reload. It also requires Node.js, a separate build step, and a non-trivial amount of configuration for what is often a pretty modest frontend. AssetMapper takes a different position. Modern browsers support ES modules natively. Instead of bundling, ship the files as-is, let the browser resolve imports through an importmap, and manage vendor dependencies through downloaded files rather than npm packages. ...

Symfony 6.0: PHP 8.1 only, and the security system rebuilt

Symfony 6.0 released November 29, 2021. The defining characteristic: PHP 8.1 is the minimum. Not supported, required. The releases team waited for PHP 8.1 to ship, then cut Symfony 6.0 the next day. This isn’t just a version bump. It’s a commitment to build against the current language instead of the historical floor. The security system, finally rebuilt The Symfony security component has two systems. The old one (AnonymousToken, GuardAuthenticatorInterface, a tangle of interfaces that made you implement methods you didn’t need) had been deprecated. 6.0 removes it entirely. ...

Symfony 5.4 LTS: enum support, route aliases, and the PHP 8.1 bridge

Symfony 5.4 landed November 29, 2021, same day as Symfony 6.0 and one day after PHP 8.1 was released. Not a coincidence. 5.4 is the LTS, and its job is to carry as much of 6.0’s feature set as possible while keeping 5.x compatibility intact. It’s also the first Symfony release that actually understands PHP 8.1 features. Enum support PHP 8.1 introduced native enums. Symfony 5.4 embraces them immediately: enum Status: string { case Active = 'active'; case Inactive = 'inactive'; } The EnumType form type renders enums as select fields, no custom transformers needed. The validator understands backed enums. The serializer maps enum values to their backing type and back. Three components updated in one shot, which meant migrating codebases from pseudo-enum constants to real PHP 8.1 enums was actually pretty smooth. ...

Symfony 5.0: String, Notifier, and the secrets vault

Symfony 5.0 released November 21, 2019, same day as 4.4. Where 4.4 is about stability and a long support window, 5.0 is the next chapter: no deprecated code, PHP 7.2.5 minimum, and a handful of new components that finally address gaps that had piled up for years. The String component PHP’s string handling is famously scattered: prefix-style functions here (str_), suffix-style there (strpos), inconsistent encoding support, and nothing object-oriented in sight. The String component wraps all of this into a fluent, unicode-aware object API: ...

Symfony 4.4 LTS: HttpClient, Mailer, Messenger, and the features that stayed

Symfony 4.4 and 5.0 both landed November 21, 2019. 4.4 is the LTS: same feature set as 5.0, deprecation layer baked in, and a long support window for teams that can’t follow every release. The feature worth singling out arrived in 4.2 and matured through 4.3 and 4.4: HttpClient. HttpClient PHP’s built-in HTTP options (file_get_contents with stream contexts, cURL, Guzzle) each have their own model, their own quirks, and their own abstraction cost. Symfony 4.2 introduced HttpClient, a first-party HTTP client with one API over multiple transports. ...

Symfony 4.0: Flex and the end of the Standard Edition

Symfony 4.0 released November 30, 2017, same day as 3.4. The shared release date is pretty much the only thing they have in common. 4.0 is a different philosophy. The Symfony Standard Edition, the monolithic starting point that bundled everything and left you to remove what you didn’t need, is gone. In its place: a microframework that grows. Flex Symfony Flex is a Composer plugin that changes how you install Symfony packages. Before Flex, adding a bundle meant: install via Composer, register in AppKernel.php, add config to config/, update routing if needed. Four steps, all manual. ...

Symfony 3.4 LTS: the bridge you actually want to cross

Symfony 3.4 and 4.0 were released the same day: November 30, 2017. That’s not a coincidence, it’s the strategy. 3.4 is not a feature release. It ships with exactly the same features as 3.3, plus every deprecation warning that 4.0 will enforce. Its whole purpose is to be the migration tool: upgrade from 3.3 to 3.4, fix what’s in your logs, then step to 4.0 cleanly. Why LTS releases matter in Symfony’s model Symfony releases a new minor version every six months. That pace would be brutal for production apps to follow, so the project designates every fourth minor as an LTS: three years of bug fixes, four of security fixes. Which means teams can target 3.4 and mostly stop thinking about upgrades for a while. ...