diff --git a/Gemfile.lock b/Gemfile.lock
index 5492aa4..a92a166 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rabbit_carrots (1.0.3)
+    rabbit_carrots (1.0.4)
       bunny (>= 2.22)
       connection_pool (~> 2.4)
 
diff --git a/lib/puma/plugin/rabbit_carrots.rb b/lib/puma/plugin/rabbit_carrots.rb
index e4301ea..3344c16 100644
--- a/lib/puma/plugin/rabbit_carrots.rb
+++ b/lib/puma/plugin/rabbit_carrots.rb
@@ -1,5 +1,4 @@
 # rabbit_carrots.rb
-
 require 'puma/plugin'
 require 'rabbit_carrots'
 
@@ -8,7 +7,7 @@ Puma::Plugin.create do
 
   def start(launcher)
     @log_writer = launcher.log_writer
-    @puma_pid = $PROCESS_ID
+    @puma_pid = $$
 
     @core_service = RabbitCarrots::Core.new(logger: log_writer)
 
@@ -58,7 +57,7 @@ Puma::Plugin.create do
     loop do
       if send(process_dead)
         log message
-        Process.kill('TERM', $PROCESS_ID)
+        Process.kill('TERM', $$)
         break
       end
       sleep 2
diff --git a/lib/rabbit_carrots/core.rb b/lib/rabbit_carrots/core.rb
index 4297092..c77f286 100644
--- a/lib/rabbit_carrots/core.rb
+++ b/lib/rabbit_carrots/core.rb
@@ -125,12 +125,15 @@ module RabbitCarrots
       def adapter.info(msg)
         @logger.write("[INFO] #{msg}\n")
       end
+
       def adapter.error(msg)
         @logger.write("[ERROR] #{msg}\n")
       end
+
       def adapter.warn(msg)
         @logger.write("[WARN] #{msg}\n")
       end
+
       adapter.instance_variable_set(:@logger, logger)
       adapter
     end
diff --git a/lib/rabbit_carrots/version.rb b/lib/rabbit_carrots/version.rb
index 55c2024..a05e114 100644
--- a/lib/rabbit_carrots/version.rb
+++ b/lib/rabbit_carrots/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module RabbitCarrots
-  VERSION = '1.0.3'
+  VERSION = '1.0.4'
 end