diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b49e0ce..90a11b6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,6 +29,12 @@ jobs:
         symfony-require: ['']
         variant: [normal]
         include:
+          # Lowest versions allowed by composer.json, on the lowest supported PHP version
+          - php-version: '8.2'
+            dependencies: lowest
+            allowed-to-fail: false
+            symfony-require: ''
+            variant: normal
           - php-version: '8.2'
             dependencies: highest
             allowed-to-fail: false
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb71ade..ba4733e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@ Latest
 ------
 
 ### Changes
+* [#49](https://github.com/cleverage/flysystem-process-bundle/issues/49) CI: test the lowest versions allowed by `composer.json` (`--prefer-lowest`, PHP 8.2). Require `psr/log` `^2|^3`: `cleverage/process-bundle` 5.x uses the typed `LoggerInterface` signatures (fatal error with `psr/log` 1).
 * [#47](https://github.com/cleverage/flysystem-process-bundle/issues/47) Add a `.gitattributes`: the development files (`.docker/`, `.github/`, `tests/`, quality tools and PHPUnit configurations, `Makefile`) are no longer part of the archive installed by Composer (`dist`).
 * [#45](https://github.com/cleverage/flysystem-process-bundle/issues/45) Require `league/flysystem` and `psr/log`, used directly by the tasks but only installed through `league/flysystem-bundle` and `cleverage/process-bundle`; add `league/flysystem-local` (used by the tests) to the dev requirements.
 
diff --git a/composer.json b/composer.json
index 403a04f..e74bd9e 100644
--- a/composer.json
+++ b/composer.json
@@ -53,7 +53,7 @@
         "cleverage/process-bundle": "^5.0",
         "league/flysystem": "^3.0",
         "league/flysystem-bundle": "^3.0",
-        "psr/log": "^1|^2|^3",
+        "psr/log": "^2|^3",
         "symfony/config": "^6.4|^7.4|^8",
         "symfony/dependency-injection": "^6.4|^7.4|^8",
         "symfony/finder": "^6.4|^7.4|^8",