diff --git a/service-api/app/composer.json b/service-api/app/composer.json
index 587b776df3..f3d2ac1223 100644
--- a/service-api/app/composer.json
+++ b/service-api/app/composer.json
@@ -44,7 +44,7 @@
         "ext-apcu": "*",
         "alphagov/notifications-php-client": "^4.1.0",
         "aws/aws-sdk-php": "^3.93",
-        "blazon/psr11-monolog": "^4.0",
+        "blazon/psr11-monolog": "^5.0",
         "elie29/zend-phpdi-config": "^8.0",
         "facile-it/php-openid-client": "^0.3.4",
         "guzzlehttp/guzzle": "^6.3",
diff --git a/service-front/app/composer.json b/service-front/app/composer.json
index 2a20d157f8..1638c1bce5 100644
--- a/service-front/app/composer.json
+++ b/service-front/app/composer.json
@@ -41,7 +41,7 @@
         "ext-json": "*",
         "ext-redis": "*",
         "aws/aws-sdk-php": "^3.208.9",
-        "blazon/psr11-monolog": "^4.0",
+        "blazon/psr11-monolog": "^5.0",
         "cooperaj/better-twig-i18n": "^3.0",
         "dflydev/fig-cookies": "^3.0",
         "elie29/zend-phpdi-config": "^8.0",