diff --git a/composer.json b/composer.json
index 9d39f51a..ce000c08 100644
--- a/composer.json
+++ b/composer.json
@@ -53,7 +53,7 @@
     "require-dev": {
         "doctrine/annotations": "^1.13",
         "doctrine/orm": "^2.5",
-        "monolog/monolog": "^1.26.1",
+        "monolog/monolog": "^2.9.1",
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "^0.12.58",
         "phpstan/phpstan-phpunit": "^0.12.11",