diff --git a/Gemfile b/Gemfile
index 706beac..a9c80b8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'http://rubygems.org'
 
 ruby '2.2.0'
 
-gem 'slack-ruby-bot', '~> 0.3.0'
+gem 'slack-ruby-bot'
 gem 'puma'
 gem 'sinatra'
 gem 'dentaku'
diff --git a/Gemfile.lock b/Gemfile.lock
index 725d866..dd3c8d8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,8 +9,8 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.3.8)
     ast (2.0.0)
-    astrolabe (1.3.0)
-      parser (>= 2.2.0.pre.3, < 3.0)
+    astrolabe (1.3.1)
+      parser (~> 2.2)
     crack (0.4.2)
       safe_yaml (~> 1.0.0)
     dentaku (1.2.6)
@@ -24,7 +24,7 @@ GEM
       faraday (~> 0.9.0)
       faraday_middleware (~> 0.9.1)
       oj (~> 2.0)
-    faye-websocket (0.9.2)
+    faye-websocket (0.10.0)
       eventmachine (>= 0.12.0)
       websocket-driver (>= 0.5.1)
     foreman (0.78.0)
@@ -40,14 +40,12 @@ GEM
     launchy (2.4.3)
       addressable (~> 2.3)
     minitest (5.7.0)
-    multi_json (1.11.2)
     multipart-post (2.0.0)
     oj (2.12.10)
-    parser (2.3.0.pre.2)
+    parser (2.2.2.6)
       ast (>= 1.1, < 3.0)
     powerpack (0.1.1)
-    puma (2.11.3)
-      rack (>= 1.1, < 2.0)
+    puma (2.12.2)
     rack (1.6.4)
     rack-protection (1.5.3)
       rack
@@ -59,12 +57,12 @@ GEM
       rspec-core (~> 3.3.0)
       rspec-expectations (~> 3.3.0)
       rspec-mocks (~> 3.3.0)
-    rspec-core (3.3.1)
+    rspec-core (3.3.2)
       rspec-support (~> 3.3.0)
-    rspec-expectations (3.3.0)
+    rspec-expectations (3.3.1)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.3.0)
-    rspec-mocks (3.3.1)
+    rspec-mocks (3.3.2)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.3.0)
     rspec-support (3.3.0)
@@ -80,17 +78,17 @@ GEM
       rack (~> 1.4)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    slack-api (1.1.6)
-      faraday (>= 0.7, < 0.10)
-      faraday_middleware (~> 0.8)
-      faye-websocket (~> 0.9.2)
-      multi_json (~> 1.0, >= 1.0.3)
-    slack-ruby-bot (0.3.0)
+    slack-ruby-bot (0.4.0)
       activesupport
       giphy (~> 2.0.2)
       hashie
-      slack-api (~> 1.1.6)
+      slack-ruby-client
       websocket-driver (~> 0.5.4)
+    slack-ruby-client (0.1.0)
+      eventmachine
+      faraday
+      faraday_middleware
+      faye-websocket
     thor (0.19.1)
     thread_safe (0.3.5)
     tilt (2.0.1)
@@ -116,6 +114,6 @@ DEPENDENCIES
   rspec
   rubocop (= 0.31.0)
   sinatra
-  slack-ruby-bot (~> 0.3.0)
+  slack-ruby-bot
   vcr
   webmock
diff --git a/slack-mathbot/commands/about.rb b/slack-mathbot/commands/about.rb
index 7aaed2d..e4f0620 100644
--- a/slack-mathbot/commands/about.rb
+++ b/slack-mathbot/commands/about.rb
@@ -3,8 +3,8 @@ module SlackMathbot
     class Default < SlackRubyBot::Commands::Base
       match(/^(?<bot>\w*)$/)
 
-      def self.call(data, _match)
-        send_message_with_gif data.channel, SlackMathbot::ABOUT, 'math'
+      def self.call(client, data, _match)
+        send_message_with_gif client, data.channel, SlackMathbot::ABOUT, 'math'
       end
     end
   end
diff --git a/slack-mathbot/commands/calculate.rb b/slack-mathbot/commands/calculate.rb
index 15c7bbc..8df6976 100644
--- a/slack-mathbot/commands/calculate.rb
+++ b/slack-mathbot/commands/calculate.rb
@@ -4,16 +4,16 @@ module SlackMathbot
       operator '='
       command 'calculate'
 
-      def self.call(data, match)
+      def self.call(client, data, match)
         result = Dentaku::Calculator.new.evaluate(match[:expression]) if match.names.include?('expression')
         result = result.to_s if result
         if result && result.length > 0
-          send_message data.channel, result
+          send_message client, data.channel, result
         else
-          send_message_with_gif data.channel, 'Got nothing.', 'nothing'
+          send_message_with_gif client, data.channel, 'Got nothing.', 'nothing'
         end
       rescue StandardError => e
-        send_message_with_gif data.channel, "Sorry, #{e.message}.", 'idiot'
+        send_message_with_gif client, data.channel, "Sorry, #{e.message}.", 'idiot'
       end
     end
   end
diff --git a/slack-mathbot/commands/help.rb b/slack-mathbot/commands/help.rb
index 26c47d1..752566d 100644
--- a/slack-mathbot/commands/help.rb
+++ b/slack-mathbot/commands/help.rb
@@ -1,8 +1,8 @@
 module SlackMathbot
   module Commands
     class Help < SlackRubyBot::Commands::Base
-      def self.call(data, _match)
-        send_message_with_gif data.channel, 'See https://github.com/dblock/slack-mathbot, please.', 'help'
+      def self.call(client, data, _match)
+        send_message_with_gif client, data.channel, 'See https://github.com/dblock/slack-mathbot, please.', 'help'
       end
     end
   end
diff --git a/spec/slack-mathbot/commands/unknown_spec.rb b/spec/slack-mathbot/commands/unknown_spec.rb
index 2bde2af..56e1d52 100644
--- a/spec/slack-mathbot/commands/unknown_spec.rb
+++ b/spec/slack-mathbot/commands/unknown_spec.rb
@@ -4,11 +4,12 @@ describe SlackRubyBot::Commands::Unknown do
   def app
     SlackMathbot::App.new
   end
+  let(:client) { app.send(:client) }
   it 'invalid command' do
     expect(message: 'mathbot foobar').to respond_with_slack_message("Sorry <@user>, I don't understand that command!")
   end
   it 'does not respond to sad face' do
     expect(SlackRubyBot::Commands::Base).to_not receive(:send_message)
-    SlackMathbot::App.new.send(:message, text: ':((')
+    SlackMathbot::App.new.send(:message, client, text: ':((')
   end
 end