diff --git a/CHANGELOG b/CHANGELOG
index 0918bc1..c7b93fb 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -3,6 +3,10 @@ SlackBundle unplanned
 - Feature: Commands compatible to Symfony 3.4 (by @alister)
 - (NOT BC) Feature: Remove old command prefixes (see v1.3) (by @alister)
 - Patch: removed different typos (by @alister)
+SlackBundle v2.4.0
+==================
+- Feature: Support for more fields in attachments and additional client options for Messaging::message() (by @pmishev=
+- Support for Symfony 4.0
 
 SlackBundle v2.3.0
 ==================
diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index dd4f1d8..f447b15 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -2,24 +2,30 @@ services:
 
     dz.slack.identity_bag:
         class: DZunke\SlackBundle\Slack\Messaging\IdentityBag
+        public: true
 
     dz.slack.connection:
         class: DZunke\SlackBundle\Slack\Client\Connection
+        public: true
 
     dz.slack.client:
         class: DZunke\SlackBundle\Slack\Client
+        public: true
         arguments: ["@dz.slack.connection"]
 
     dz.slack.messaging:
         class: DZunke\SlackBundle\Slack\Messaging
+        public: true
         arguments: ["@dz.slack.client", "@dz.slack.identity_bag"]
 
     dz.slack.channels:
         class: DZunke\SlackBundle\Slack\Channels
+        public: true
         arguments: ["@dz.slack.client"]
 
     dz.slack.users:
         class: DZunke\SlackBundle\Slack\Users
+        public: true
         arguments: ["@dz.slack.client"]
 
     DZunke\SlackBundle\Command\BotMessagingCommand:
diff --git a/composer.json b/composer.json
index bb58bc5..ebd4818 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     },
     "require": {
         "php": ">=5.6",
-        "symfony/symfony": "~2.8|~3.0",
+        "symfony/symfony": "~2.8|~3.0|~4.0",
         "guzzlehttp/guzzle": "^6.2.1"
     },
     "autoload": {