diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9d2067da..cf252eb9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -182,6 +182,8 @@ jobs:
       matrix:
         php-version: ['8.0', '8.1']
     continue-on-error: ${{ matrix.php-version == '8.1' }}
+    env:
+      LC_ALL: C
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c56b8837..2002a898 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com), and this
 
 ### Changed
 * [#1218](https://github.com/shlinkio/shlink/issues/1218) Updated to symfony/mercure 0.6.
+* [#1223](https://github.com/shlinkio/shlink/issues/1223) Updated to phpstan 1.0.
 
 ### Deprecated
 * *Nothing*
diff --git a/composer.json b/composer.json
index d520f6fb..1d1eaa07 100644
--- a/composer.json
+++ b/composer.json
@@ -67,9 +67,9 @@
         "eaglewu/swoole-ide-helper": "dev-master",
         "infection/infection": "^0.25.0",
         "phpspec/prophecy-phpunit": "^2.0",
-        "phpstan/phpstan": "^0.12.94",
-        "phpstan/phpstan-doctrine": "^0.12.42",
-        "phpstan/phpstan-symfony": "^0.12.41",
+        "phpstan/phpstan": "^1.0",
+        "phpstan/phpstan-doctrine": "^1.0",
+        "phpstan/phpstan-symfony": "^1.0",
         "phpunit/php-code-coverage": "^9.2",
         "phpunit/phpunit": "^9.5",
         "roave/security-advisories": "dev-master",