diff --git a/Gemfile b/Gemfile
index 17f58c92..84bdadba 100644
--- a/Gemfile
+++ b/Gemfile
@@ -21,7 +21,7 @@ unless ENV['PUMA_NO_RUBOCOP'] || RUBY_PLATFORM.include?('mswin')
   gem 'rubocop-performance', require: false
 end
 
-if %w(2.2.7 2.2.8 2.2.9 2.2.10 2.3.4 2.4.1).include? RUBY_VERSION
+if RUBY_VERSION == '2.4.1'
   gem "stopgap_13632", "~> 1.0", :platforms => ["mri", "mingw", "x64_mingw"]
 end
 
diff --git a/ext/puma_http11/extconf.rb b/ext/puma_http11/extconf.rb
index bae4d696..031c33ed 100644
--- a/ext/puma_http11/extconf.rb
+++ b/ext/puma_http11/extconf.rb
@@ -2,7 +2,7 @@ require 'mkmf'
 
 dir_config("puma_http11")
 
-if $mingw && RUBY_VERSION >= '2.4'
+if $mingw
   append_cflags  '-fstack-protector-strong -D_FORTIFY_SOURCE=2'
   append_ldflags '-fstack-protector-strong -l:libssp.a'
   have_library 'ssp'
@@ -13,7 +13,7 @@ unless ENV["PUMA_DISABLE_SSL"]
   has_openssl_dir = dir_config('openssl').any?
   found_pkg_config = !has_openssl_dir && pkg_config('openssl')
 
-  found_ssl = if (!$mingw || RUBY_VERSION >= '2.4') && found_pkg_config
+  found_ssl = if !$mingw && found_pkg_config
     puts 'using OpenSSL pkgconfig (openssl.pc)'
     true
   elsif have_library('libcrypto', 'BIO_read') && have_library('libssl', 'SSL_CTX_new')
diff --git a/test/helper.rb b/test/helper.rb
index fc72da06..da5ba4cb 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -2,7 +2,7 @@
 # Copyright (c) 2011 Evan Phoenix
 # Copyright (c) 2005 Zed A. Shaw
 
-if %w(2.2.7 2.2.8 2.2.9 2.2.10 2.3.4 2.4.1).include? RUBY_VERSION
+if RUBY_VERSION == '2.4.1'
   begin
     require 'stopgap_13632'
   rescue LoadError
diff --git a/test/helpers/integration.rb b/test/helpers/integration.rb
index 159420af..c74f969d 100644
--- a/test/helpers/integration.rb
+++ b/test/helpers/integration.rb
@@ -277,7 +277,6 @@ class TestIntegration < Minitest::Test
  - file descriptors are not preserved on exec on JRuby; connection reset errors are expected during restarts
     MSG
     skip_if :truffleruby, suffix: ' - Undiagnosed failures on TruffleRuby'
-    skip "Undiagnosed failures on Ruby 2.2" if RUBY_VERSION < '2.3'
 
     args = "-w #{workers} -t 0:5 -q test/rackup/hello_with_delay.ru"
     if Puma.windows?
diff --git a/test/test_integration_cluster.rb b/test/test_integration_cluster.rb
index d9d369da..7a22aed1 100644
--- a/test/test_integration_cluster.rb
+++ b/test/test_integration_cluster.rb
@@ -88,7 +88,6 @@ class TestIntegrationCluster < TestIntegration
 
   def test_term_closes_listeners_tcp
     skip_unless_signal_exist? :TERM
-    skip "Intermittent failure on Ruby 2.2" if RUBY_VERSION < '2.3'
     term_closes_listeners unix: false
   end
 
@@ -132,8 +131,6 @@ class TestIntegrationCluster < TestIntegration
   end
 
   def test_term_worker_clean_exit
-    skip "Intermittent failure on Ruby 2.2" if RUBY_VERSION < '2.3'
-
     cli_server "-w #{workers} test/rackup/hello.ru"
 
     # Get the PIDs of the child workers.
diff --git a/test/test_puma_server_ssl.rb b/test/test_puma_server_ssl.rb
index ef36775d..47677fec 100644
--- a/test/test_puma_server_ssl.rb
+++ b/test/test_puma_server_ssl.rb
@@ -140,8 +140,7 @@ class TestPumaServerSSL < Minitest::Test
     skip("SSLv3 protocol is unavailable") if Puma::MiniSSL::OPENSSL_NO_SSL3
     start_server
     @http.ssl_version= :SSLv3
-    # Ruby 2.4.5 on Travis raises ArgumentError
-    assert_raises(OpenSSL::SSL::SSLError, ArgumentError) do
+    assert_raises(OpenSSL::SSL::SSLError) do
       @http.start do
         Net::HTTP::Get.new '/'
       end
@@ -161,8 +160,7 @@ class TestPumaServerSSL < Minitest::Test
     else
       @http.ssl_version = :TLSv1
     end
-    # Ruby 2.4.5 on Travis raises ArgumentError
-    assert_raises(OpenSSL::SSL::SSLError, ArgumentError) do
+    assert_raises(OpenSSL::SSL::SSLError) do
       @http.start do
         Net::HTTP::Get.new '/'
       end
@@ -181,8 +179,7 @@ class TestPumaServerSSL < Minitest::Test
     else
       @http.ssl_version = :TLSv1_1
     end
-    # Ruby 2.4.5 on Travis raises ArgumentError
-    assert_raises(OpenSSL::SSL::SSLError, ArgumentError) do
+    assert_raises(OpenSSL::SSL::SSLError) do
       @http.start do
         Net::HTTP::Get.new '/'
       end