diff --git a/composer.json b/composer.json
index db43f42..fb1ed19 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "php": "^7.4 || ^8.0",
         "ext-json": "*",
         "chesslablab/php-chess": "^1.3",
-        "monolog/monolog": "^2.8",
+        "monolog/monolog": "^3.5",
         "php-di/php-di": "^6.4",
         "slim/http": "^1.3",
         "slim/php-view": "^3.2",
diff --git a/composer.lock b/composer.lock
index 3da336c..1693baf 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "391968d9aa8b4248f0c8c8b9cfae350a",
+    "content-hash": "b3bf1a8177cf4f07c003b6fce0c2f6a1",
     "packages": [
         {
             "name": "amphp/amp",
@@ -804,42 +804,41 @@
         },
         {
             "name": "monolog/monolog",
-            "version": "2.9.2",
+            "version": "3.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "437cb3628f4cf6042cc10ae97fc2b8472e48ca1f"
+                "reference": "c915e2634718dbc8a4a15c61b0e62e7a44e14448"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/437cb3628f4cf6042cc10ae97fc2b8472e48ca1f",
-                "reference": "437cb3628f4cf6042cc10ae97fc2b8472e48ca1f",
+                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/c915e2634718dbc8a4a15c61b0e62e7a44e14448",
+                "reference": "c915e2634718dbc8a4a15c61b0e62e7a44e14448",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2",
-                "psr/log": "^1.0.1 || ^2.0 || ^3.0"
+                "php": ">=8.1",
+                "psr/log": "^2.0 || ^3.0"
             },
             "provide": {
-                "psr/log-implementation": "1.0.0 || 2.0.0 || 3.0.0"
+                "psr/log-implementation": "3.0.0"
             },
             "require-dev": {
-                "aws/aws-sdk-php": "^2.4.9 || ^3.0",
+                "aws/aws-sdk-php": "^3.0",
                 "doctrine/couchdb": "~1.0@dev",
                 "elasticsearch/elasticsearch": "^7 || ^8",
                 "ext-json": "*",
-                "graylog2/gelf-php": "^1.4.2 || ^2@dev",
-                "guzzlehttp/guzzle": "^7.4",
+                "graylog2/gelf-php": "^1.4.2 || ^2.0",
+                "guzzlehttp/guzzle": "^7.4.5",
                 "guzzlehttp/psr7": "^2.2",
                 "mongodb/mongodb": "^1.8",
                 "php-amqplib/php-amqplib": "~2.4 || ^3",
-                "phpspec/prophecy": "^1.15",
-                "phpstan/phpstan": "^0.12.91",
-                "phpunit/phpunit": "^8.5.14",
-                "predis/predis": "^1.1 || ^2.0",
-                "rollbar/rollbar": "^1.3 || ^2 || ^3",
+                "phpstan/phpstan": "^1.9",
+                "phpstan/phpstan-deprecation-rules": "^1.0",
+                "phpstan/phpstan-strict-rules": "^1.4",
+                "phpunit/phpunit": "^10.1",
+                "predis/predis": "^1.1 || ^2",
                 "ruflin/elastica": "^7",
-                "swiftmailer/swiftmailer": "^5.3|^6.0",
                 "symfony/mailer": "^5.4 || ^6",
                 "symfony/mime": "^5.4 || ^6"
             },
@@ -862,7 +861,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "2.x-dev"
+                    "dev-main": "3.x-dev"
                 }
             },
             "autoload": {
@@ -890,7 +889,7 @@
             ],
             "support": {
                 "issues": "https://github.com/Seldaek/monolog/issues",
-                "source": "https://github.com/Seldaek/monolog/tree/2.9.2"
+                "source": "https://github.com/Seldaek/monolog/tree/3.5.0"
             },
             "funding": [
                 {
@@ -902,7 +901,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-10-27T15:25:26+00:00"
+            "time": "2023-10-27T15:32:31+00:00"
         },
         {
             "name": "nikic/fast-route",