diff --git a/fluentd.gemspec b/fluentd.gemspec
index 83c5abc18d..0274f22136 100644
--- a/fluentd.gemspec
+++ b/fluentd.gemspec
@@ -52,6 +52,5 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency("test-unit", ["~> 3.3"])
   gem.add_development_dependency("test-unit-rr", ["~> 1.0"])
   gem.add_development_dependency("oj", [">= 2.14", "< 4"])
-  gem.add_development_dependency("async", "~> 1.23")
   gem.add_development_dependency("async-http", ">= 0.50.0")
 end
diff --git a/lib/fluent/plugin_helper/http_server/server.rb b/lib/fluent/plugin_helper/http_server/server.rb
index 4266bc639f..d1af7192c3 100644
--- a/lib/fluent/plugin_helper/http_server/server.rb
+++ b/lib/fluent/plugin_helper/http_server/server.rb
@@ -38,7 +38,8 @@ def initialize(addr:, port:, logger:, default_app: nil, tls_context: nil)
           scheme = tls_context ? 'https' : 'http'
           @uri = URI("#{scheme}://#{@addr}:#{@port}").to_s
           @router = Router.new(default_app)
-          @reactor = Async::Reactor.new(nil, logger: @logger)
+          @server_task = nil
+          Console.logger = @logger
 
           opts = if tls_context
                    { ssl_context: tls_context }
@@ -54,23 +55,24 @@ def initialize(addr:, port:, logger:, default_app: nil, tls_context: nil)
 
         def start(notify = nil)
           @logger.debug("Start async HTTP server listening #{@uri}")
-          task = @reactor.run do
-            @server.run
 
+          Async do |task|
+	    @server_task = task.async do
+	      @server.run
+	    end
             if notify
               notify.push(:ready)
             end
           end
 
-          task.stop
           @logger.debug('Finished HTTP server')
         end
 
         def stop
           @logger.debug('closing HTTP server')
 
-          if @reactor
-            @reactor.stop
+          if @server_task
+            @server_task.stop
           end
         end
 
diff --git a/test/plugin_helper/test_http_server_helper.rb b/test/plugin_helper/test_http_server_helper.rb
index 6691c9182d..27cc3d32d5 100644
--- a/test/plugin_helper/test_http_server_helper.rb
+++ b/test/plugin_helper/test_http_server_helper.rb
@@ -127,12 +127,12 @@ def start_https_request(addr, port, verify: true, cert_path: nil, selfsigned: tr
     end
 
     client = Async::HTTP::Client.new(Async::HTTP::Endpoint.parse("https://#{addr}:#{port}", ssl_context: context))
-    reactor = Async::Reactor.new(nil, logger: NULL_LOGGER)
+    Console.logger = NULL_LOGGER
 
     resp = nil
     error = nil
 
-    reactor.run do
+    Async do |task|
       begin
         response = yield(client)
       rescue => e               # Async::Reactor rescue all error. handle it by myself