diff --git a/Gemfile b/Gemfile
index 72330acbf..e8639a5bd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -94,7 +94,7 @@ gem 'twitty', '~> 0.1.5'
 # facebook client
 gem 'koala'
 # slack client
-gem 'slack-ruby-client', '~> 2.2.0'
+gem 'slack-ruby-client', '~> 2.5.1'
 # for dialogflow integrations
 gem 'google-cloud-dialogflow-v2', '>= 0.24.0'
 gem 'grpc'
diff --git a/Gemfile.lock b/Gemfile.lock
index ff0197a90..080883b67 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -272,7 +272,8 @@ GEM
       googleauth (~> 1.0)
       grpc (~> 1.36)
     geocoder (1.8.1)
-    gli (2.21.1)
+    gli (2.22.2)
+      ostruct
     globalid (1.2.1)
       activesupport (>= 6.1)
     gmail_xoauth (0.4.3)
@@ -537,6 +538,7 @@ GEM
     openssl (3.2.0)
     orm_adapter (0.5.0)
     os (1.1.4)
+    ostruct (0.6.1)
     parallel (1.23.0)
     parser (3.2.2.1)
       ast (~> 2.4.1)
@@ -745,12 +747,13 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    slack-ruby-client (2.2.0)
+    slack-ruby-client (2.5.1)
       faraday (>= 2.0)
       faraday-mashify
       faraday-multipart
       gli
       hashie
+      logger
     snaky_hash (2.0.1)
       hashie
       version_gem (~> 1.1, >= 1.1.1)
@@ -951,7 +954,7 @@ DEPENDENCIES
   sidekiq (>= 7.3.1)
   sidekiq-cron (>= 1.12.0)
   simplecov (= 0.17.1)
-  slack-ruby-client (~> 2.2.0)
+  slack-ruby-client (~> 2.5.1)
   spring
   spring-watcher-listen
   squasher
diff --git a/lib/integrations/slack/send_on_slack_service.rb b/lib/integrations/slack/send_on_slack_service.rb
index 20a65905c..c1454b869 100644
--- a/lib/integrations/slack/send_on_slack_service.rb
+++ b/lib/integrations/slack/send_on_slack_service.rb
@@ -119,12 +119,14 @@ class Integrations::Slack::SendOnSlackService < Base::SendOnChannelService
   def upload_file
     return unless message.attachments.first.with_attached_file?
 
-    result = slack_client.files_upload({
-      channels: hook.reference_id,
+    result = slack_client.files_upload_v2(
+      filename: message.attachments.first.file.filename,
+      content: message.attachments.first.file.download,
       initial_comment: 'Attached File!',
-      thread_ts: conversation.identifier
-    }.merge(file_information))
-    Rails.logger.info(result)
+      thread_ts: conversation.identifier,
+      channel_id: hook.reference_id
+    )
+    Rails.logger.info "slack_upload_result: #{result}"
   end
 
   def file_type
diff --git a/spec/lib/integrations/slack/send_on_slack_service_spec.rb b/spec/lib/integrations/slack/send_on_slack_service_spec.rb
index 6524154b4..684f2bc54 100644
--- a/spec/lib/integrations/slack/send_on_slack_service_spec.rb
+++ b/spec/lib/integrations/slack/send_on_slack_service_spec.rb
@@ -162,15 +162,13 @@ describe Integrations::Slack::SendOnSlackService do
         attachment = message.attachments.new(account_id: message.account_id, file_type: :image)
         attachment.file.attach(io: Rails.root.join('spec/assets/avatar.png').open, filename: 'avatar.png', content_type: 'image/png')
 
-        expect(slack_client).to receive(:files_upload).with(hash_including(
-                                                              channels: hook.reference_id,
-                                                              thread_ts: conversation.identifier,
-                                                              initial_comment: 'Attached File!',
-                                                              filetype: 'png',
-                                                              content: anything,
-                                                              filename: attachment.file.filename,
-                                                              title: attachment.file.filename
-                                                            )).and_return(file_attachment)
+        expect(slack_client).to receive(:files_upload_v2).with(
+          filename: attachment.file.filename,
+          content: anything,
+          channel_id: hook.reference_id,
+          thread_ts: conversation.identifier,
+          initial_comment: 'Attached File!'
+        ).and_return(file_attachment)
 
         message.save!