diff --git a/test/stdlib/Net_HTTP_test.rb b/test/stdlib/Net_HTTP_test.rb
index ab386659a..e9e34d212 100644
--- a/test/stdlib/Net_HTTP_test.rb
+++ b/test/stdlib/Net_HTTP_test.rb
@@ -9,6 +9,9 @@ class NetSingletonTest < Test::Unit::TestCase
   testing "singleton(::Net::HTTP)"
 
   def test_get
+    omit if ci?
+
+    $stdout = StringIO.new
     assert_send_type "(URI::Generic) -> nil",
                      Net::HTTP, :get_print, URI("https://www.ruby-lang.org")
     assert_send_type "(String, String) -> nil",
@@ -27,9 +30,13 @@ def test_get
                      Net::HTTP, :get_response, 'www.ruby-lang.org', '/en'
     assert_send_type "(URI::Generic, Hash[String, String]) -> Net::HTTPResponse",
                      Net::HTTP, :get_response, URI("https://www.ruby-lang.org"), {"Accept" => "text/html"} if RUBY_VERSION >= '3.0'
+  ensure
+    $stdout = STDOUT
   end
 
   def test_post
+    omit if ci?
+
     assert_send_type "(URI, String, Hash[String, String]) -> Net::HTTPResponse",
                      Net::HTTP, :post, URI('http://www.example.com/api/search'), { "q" => "ruby", "max" => "50" }.to_json, "Content-Type" => "application/json"
     assert_send_type "(URI, Hash[String, Symbol]) -> Net::HTTPResponse",
@@ -37,6 +44,8 @@ def test_post
   end
 
   def test_new
+    omit if ci?
+
     assert_send_type "(String, Integer, nil, nil, nil, nil, nil) -> Net::HTTP",
                      Net::HTTP, :new, 'www.ruby-lang.org', 80, nil, nil, nil, nil, nil
   end
@@ -55,26 +64,32 @@ def self.new
   end
 
   def test_inspect
+    omit if ci?
+
     assert_send_type "() -> String",
                      TestNet.new, :inspect
   end
 
   def test_set_debug_output
+    omit if ci?
     assert_send_type "(IO) -> void",
                      TestNet.new, :set_debug_output, $stderr
   end
 
   def test_address
+    omit if ci?
     assert_send_type "() -> String",
                      TestNet.new, :address
   end
 
   def test_port
+    omit if ci?
     assert_send_type "() -> Integer",
                      TestNet.new, :port
   end
 
   def test_ipaddr
+    omit if ci?
     assert_send_type "() -> nil",
                      TestNet.new, :ipaddr
     assert_send_type "(String) -> void",
@@ -82,11 +97,13 @@ def test_ipaddr
   end
 
   def test_open_timeout
+    omit if ci?
     assert_send_type "() -> Integer",
                      TestNet.new, :open_timeout
   end
 
   def test_read_timeout
+    omit if ci?
     assert_send_type "() -> Integer",
                      TestNet.new, :read_timeout
     assert_send_type "(Integer) -> void",
@@ -94,6 +111,7 @@ def test_read_timeout
   end
 
   def test_write_timeout
+    omit if ci?
     assert_send_type "() -> Integer",
                      TestNet.new, :write_timeout
     assert_send_type "(Integer) -> void",
@@ -101,6 +119,7 @@ def test_write_timeout
   end
 
   def test_continue_timeout
+    omit if ci?
     assert_send_type "() -> nil",
                      TestNet.new, :continue_timeout
     assert_send_type "(Integer) -> void",
@@ -108,6 +127,8 @@ def test_continue_timeout
   end
 
   def test_max_retries
+    omit if ci?
+
     assert_send_type "() -> Integer",
                      TestNet.new, :max_retries
     assert_send_type "(Integer) -> void",
@@ -115,11 +136,15 @@ def test_max_retries
   end
 
   def test_keep_alive_timeout
+    omit if ci?
+
     assert_send_type "() -> Integer",
                      TestNet.new, :keep_alive_timeout
   end
 
   def test_started_?
+    omit if ci?
+
     assert_send_type "() -> bool",
                      TestNet.new, :started?
     assert_send_type "() -> bool",
@@ -127,6 +152,8 @@ def test_started_?
   end
 
   def test_use_ssl
+    omit if ci?
+
     assert_send_type "() -> bool",
                      TestNet.new, :use_ssl?
     assert_send_type "(bool) -> void",
@@ -134,6 +161,8 @@ def test_use_ssl
   end
 
   def test_start
+    omit if ci?
+
     assert_send_type "() { (Net::HTTP) -> untyped } -> untyped",
                      TestNet.new, :start do |net_http| net_http.class end
     assert_send_type "() -> Net::HTTP",
@@ -141,6 +170,8 @@ def test_start
   end
 
   def test_proxy
+    omit if ci?
+
     assert_send_type "() -> bool",
                      TestNet.new, :proxy?
     assert_send_type "() -> bool",
@@ -162,6 +193,8 @@ def test_proxy
   end
 
   def test_http_verbs
+    omit if ci?
+
     assert_send_type "(String) -> Net::HTTPResponse",
                      Net::HTTP.start('www.ruby-lang.org', 443, use_ssl: true), :get, '/en'
     assert_send_type "(String, Hash[String, String]) -> Net::HTTPResponse",
@@ -293,6 +326,8 @@ def test_http_verbs
   end
 
   def test_request
+    omit if ci?
+
     assert_send_type "(String, String) -> Net::HTTPResponse",
                      Net::HTTP.start('reqres.in', 443, use_ssl: true), :send_request, 'GET', 'api/users'
     assert_send_type "(String, String, String, Hash[String, String]) -> Net::HTTPResponse",
@@ -311,11 +346,15 @@ class TestHTTPRequest < Test::Unit::TestCase
   testing "::Net::HTTPRequest"
 
   def test_inspect
+    omit if ci?
+
     assert_send_type "() -> String",
                      Net::HTTP::Get.new(URI('https://www.ruby-lang.org')), :inspect
   end
 
   def test_attr_readers
+    omit if ci?
+
     assert_send_type "() -> String",
                      Net::HTTP::Get.new(URI('https://www.ruby-lang.org')), :method
     assert_send_type "() -> String",
@@ -327,6 +366,8 @@ def test_attr_readers
   end
 
   def test_body
+    omit if ci?
+
     assert_send_type "() -> bool",
                      Net::HTTP::Get.new(URI('https://www.ruby-lang.org')), :request_body_permitted?
     assert_send_type "() -> bool",
@@ -344,6 +385,8 @@ def test_body
   end
 
   def test_manipulation_of_headers
+    omit if ci?
+
     assert_send_type "(String) -> nil",
                      Net::HTTP::Get.new(URI('https://www.ruby-lang.org')), :[], "Content-Type"
     assert_send_type "(String, untyped) -> void",
@@ -417,6 +460,8 @@ def test_manipulation_of_headers
   end
 
   def test_iteration_on_headers
+    omit if ci?
+
     assert_send_type "() { (String, String) -> untyped } -> Hash[String, Array[String]]",
                      Net::HTTP::Get.new(URI('https://www.ruby-lang.org')), :each_header do |str, array| "#{str} #{array}" end
     assert_send_type "() -> Enumerator[[String, String], Hash[String, Array[String]]]",
@@ -475,6 +520,8 @@ def self.success
   end
 
   def test_attr_readers
+    omit if ci?
+
     assert_send_type "() -> String",
                      Foo.success, :http_version
     assert_send_type "() -> String",
@@ -490,6 +537,8 @@ def test_attr_readers
   end
 
   def test_manipulation_function
+    omit if ci?
+
     assert_send_type "() -> String",
                      Foo.success, :inspect
     assert_send_type "() -> untyped",
@@ -509,4 +558,4 @@ def test_manipulation_function
     assert_send_type "() -> String",
                      Foo.success, :entity
   end
-end
\ No newline at end of file
+end
diff --git a/test/stdlib/test_helper.rb b/test/stdlib/test_helper.rb
index 4240554a3..4ff6fc4fd 100644
--- a/test/stdlib/test_helper.rb
+++ b/test/stdlib/test_helper.rb
@@ -338,6 +338,10 @@ def method_types(method)
     end
   end
 
+  def ci?
+    ENV["CI"] == "true"
+  end
+
   def allows_error(*errors)
     yield
   rescue *errors => exn