diff --git a/composer.json b/composer.json
index ec27d1f8..16125b08 100644
--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,6 @@
         "ext-gd": "*",
         "gregwar/captcha": "^1.1",
         "jsvrcek/ics": "^0.8",
-        "monolog/monolog": "^1",
         "google/apiclient": "^2.0"
     },
     "require-dev": {
diff --git a/composer.lock b/composer.lock
index bde48dd4..02b31504 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": "7672fd59904f8c3e22258d6cc11fb639",
+    "content-hash": "267c9af5abed01ea7960517fcef99183",
     "packages": [
         {
             "name": "firebase/php-jwt",
@@ -668,51 +668,64 @@
         },
         {
             "name": "monolog/monolog",
-            "version": "1.26.1",
+            "version": "2.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "c6b00f05152ae2c9b04a448f99c7590beb6042f5"
+                "reference": "fd4380d6fc37626e2f799f29d91195040137eba9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/c6b00f05152ae2c9b04a448f99c7590beb6042f5",
-                "reference": "c6b00f05152ae2c9b04a448f99c7590beb6042f5",
+                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/fd4380d6fc37626e2f799f29d91195040137eba9",
+                "reference": "fd4380d6fc37626e2f799f29d91195040137eba9",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0",
-                "psr/log": "~1.0"
+                "php": ">=7.2",
+                "psr/log": "^1.0.1 || ^2.0 || ^3.0"
             },
             "provide": {
-                "psr/log-implementation": "1.0.0"
+                "psr/log-implementation": "1.0.0 || 2.0.0 || 3.0.0"
             },
             "require-dev": {
                 "aws/aws-sdk-php": "^2.4.9 || ^3.0",
                 "doctrine/couchdb": "~1.0@dev",
-                "graylog2/gelf-php": "~1.0",
-                "php-amqplib/php-amqplib": "~2.4",
+                "elasticsearch/elasticsearch": "^7",
+                "graylog2/gelf-php": "^1.4.2",
+                "mongodb/mongodb": "^1.8",
+                "php-amqplib/php-amqplib": "~2.4 || ^3",
                 "php-console/php-console": "^3.1.3",
-                "phpstan/phpstan": "^0.12.59",
-                "phpunit/phpunit": "~4.5",
-                "ruflin/elastica": ">=0.90 <3.0",
-                "sentry/sentry": "^0.13",
+                "phpspec/prophecy": "^1.6.1",
+                "phpstan/phpstan": "^0.12.91",
+                "phpunit/phpunit": "^8.5",
+                "predis/predis": "^1.1",
+                "rollbar/rollbar": "^1.3",
+                "ruflin/elastica": ">=0.90@dev",
                 "swiftmailer/swiftmailer": "^5.3|^6.0"
             },
             "suggest": {
                 "aws/aws-sdk-php": "Allow sending log messages to AWS services like DynamoDB",
                 "doctrine/couchdb": "Allow sending log messages to a CouchDB server",
+                "elasticsearch/elasticsearch": "Allow sending log messages to an Elasticsearch server via official client",
                 "ext-amqp": "Allow sending log messages to an AMQP server (1.0+ required)",
-                "ext-mongo": "Allow sending log messages to a MongoDB server",
+                "ext-curl": "Required to send log messages using the IFTTTHandler, the LogglyHandler, the SendGridHandler, the SlackWebhookHandler or the TelegramBotHandler",
+                "ext-mbstring": "Allow to work properly with unicode symbols",
+                "ext-mongodb": "Allow sending log messages to a MongoDB server (via driver)",
+                "ext-openssl": "Required to send log messages using SSL",
+                "ext-sockets": "Allow sending log messages to a Syslog server (via UDP driver)",
                 "graylog2/gelf-php": "Allow sending log messages to a GrayLog2 server",
-                "mongodb/mongodb": "Allow sending log messages to a MongoDB server via PHP Driver",
+                "mongodb/mongodb": "Allow sending log messages to a MongoDB server (via library)",
                 "php-amqplib/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib",
                 "php-console/php-console": "Allow sending log messages to Google Chrome",
                 "rollbar/rollbar": "Allow sending log messages to Rollbar",
-                "ruflin/elastica": "Allow sending log messages to an Elastic Search server",
-                "sentry/sentry": "Allow sending log messages to a Sentry server"
+                "ruflin/elastica": "Allow sending log messages to an Elastic Search server"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "2.x-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "Monolog\\": "src/Monolog"
@@ -726,11 +739,11 @@
                 {
                     "name": "Jordi Boggiano",
                     "email": "j.boggiano@seld.be",
-                    "homepage": "http://seld.be"
+                    "homepage": "https://seld.be"
                 }
             ],
             "description": "Sends your logs to files, sockets, inboxes, databases and various web services",
-            "homepage": "http://github.com/Seldaek/monolog",
+            "homepage": "https://github.com/Seldaek/monolog",
             "keywords": [
                 "log",
                 "logging",
@@ -738,7 +751,7 @@
             ],
             "support": {
                 "issues": "https://github.com/Seldaek/monolog/issues",
-                "source": "https://github.com/Seldaek/monolog/tree/1.26.1"
+                "source": "https://github.com/Seldaek/monolog/tree/2.3.5"
             },
             "funding": [
                 {
@@ -750,7 +763,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-28T08:32:12+00:00"
+            "time": "2021-10-01T21:08:31+00:00"
         },
         {
             "name": "paragonie/constant_time_encoding",
@@ -4004,7 +4017,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.3",
+        "php": ">=7.4",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",