diff --git a/.travis.yml b/.travis.yml
index 21ab797..a196efa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,4 +12,7 @@ rvm:
 - 2.1.10
 - 2.2.5
 - 2.3.1
+- 2.4.6
+- 2.5.5
+- 2.6.2
 script: rake travis
diff --git a/test/test_net_http_persistent.rb b/test/test_net_http_persistent.rb
index fa64570..f80d3c8 100644
--- a/test/test_net_http_persistent.rb
+++ b/test/test_net_http_persistent.rb
@@ -120,7 +120,7 @@ def proxy_port
   def basic_connection
     raise "#{@uri} is not HTTP" unless @uri.scheme.downcase == 'http'
 
-    net_http_args = [@uri.host, @uri.port]
+    net_http_args = [@uri.hostname, @uri.port]
 
     connection = Net::HTTP::Persistent::Connection.allocate
     connection.ssl_generation = @http.ssl_generation
@@ -152,7 +152,7 @@ def r.read_body() :read_body end
   def ssl_connection
     raise "#{@uri} is not HTTPS" unless @uri.scheme.downcase == 'https'
 
-    net_http_args = [@uri.host, @uri.port]
+    net_http_args = [@uri.hostname, @uri.port]
 
     connection = Net::HTTP::Persistent::Connection.allocate
     connection.ssl_generation = @http.ssl_generation
@@ -751,7 +751,7 @@ def test_pipeline
     skip 'net-http-pipeline not installed' unless defined?(Net::HTTP::Pipeline)
 
     cached = basic_connection
-    cached.start
+    cached.http.start
 
     requests = [
       Net::HTTP::Get.new((@uri + '1').request_uri),