diff --git a/.travis.yml b/.travis.yml
index c53d44f..4632b02 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ language: ruby
 
 branches:
   only:
-    - master
+    - main
 
 rvm:
   # MRI
diff --git a/Gemfile b/Gemfile
index 9d71912..7eccca4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ require File.expand_path("on_what", File.dirname(__FILE__))
 source "https://rubygems.org"
 
 # Travis-only dependencies go here
-if on_travis? && !on_less_than_2_3? && !on_rubinius?
+if on_travis? && !on_less_than_2_3?
   group :test do
     gem "codecov", ">= 0.0.9", :require => false
   end
diff --git a/docile.gemspec b/docile.gemspec
index 965a9f8..b625f50 100644
--- a/docile.gemspec
+++ b/docile.gemspec
@@ -25,27 +25,16 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   # Specify oldest supported Ruby version
-  s.required_ruby_version = ">= 1.8.7"
+  s.required_ruby_version = ">= 1.9.3"
 
   # Run rspec tests from rake even on old Ruby versions
-  s.add_development_dependency "rake", "~> 10.5" if on_less_than_1_9_3? # Pin compatible rake on old rubies, see: https://github.com/travis-ci/travis.rb/issues/380
-  s.add_development_dependency "rake", "< 11.0"  unless on_less_than_1_9_3? # See http://stackoverflow.com/questions/35893584/nomethoderror-undefined-method-last-comment-after-upgrading-to-rake-11
+  s.add_development_dependency "rake", "< 11.0" # See http://stackoverflow.com/questions/35893584/nomethoderror-undefined-method-last-comment-after-upgrading-to-rake-11
   s.add_development_dependency "rspec", "~> 3.0"
   s.add_development_dependency "rspec-expectations", "!= 3.8.3" # Workaround for RSpec's issue, see: https://github.com/rspec/rspec-expectations/issues/1111
 
-  # Run code coverage where possible - not on Rubinius
-  unless on_rubinius?
-    # Pin versions for Travis builds on 1.9
-    s.add_development_dependency "json", "< 2.0" if on_less_than_2_0?
-
-    # Pin versions for Travis builds on 1.8
-    s.add_development_dependency "mime-types" , "~> 1.25.1" if on_1_8?
-    s.add_development_dependency "rest-client", "~> 1.6.8"  if on_1_8?
-  end
-
   # To limit needed compatibility with versions of dependencies, only configure
-  #   yard doc generation when *not* on Travis, JRuby, Rubinius, or < 2.0
-  if !on_travis? && !on_jruby? && !on_rubinius? && !on_less_than_2_0?
+  #   yard doc generation when *not* on Travis, JRuby, or < 2.3
+  if !on_travis? && !on_jruby? && !on_less_than_2_3?
     # Github flavored markdown in YARD documentation
     # http://blog.nikosd.com/2011/11/github-flavored-markdown-in-yard.html
     s.add_development_dependency "yard"
diff --git a/on_what.rb b/on_what.rb
index 60a1794..aa05269 100644
--- a/on_what.rb
+++ b/on_what.rb
@@ -9,18 +9,6 @@ def on_jruby?
   defined?(RUBY_ENGINE) && "jruby" == RUBY_ENGINE
 end
 
-def on_rubinius?
-  defined?(RUBY_ENGINE) && "rbx" == RUBY_ENGINE
-end
-
-def on_1_8?
-  RUBY_VERSION.start_with? "1.8"
-end
-
-def on_less_than_1_9_3?
-  RUBY_VERSION < "1.9.3"
-end
-
 def on_less_than_2_0?
   RUBY_VERSION < "2.0.0"
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index e6e68eb..027ab20 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,31 +1,29 @@
 require File.expand_path("on_what", File.dirname(File.dirname(__FILE__)))
 
-# Code coverage (via SimpleCov) on Ruby 1.9+
-unless on_1_8?
-  begin
-    require "simplecov"
-    SimpleCov.start do
-      add_filter "/spec/"      # exclude test code
-      add_filter "/vendor/"    # exclude gems which are vendored on Travis CI
-      add_filter "/on_what.rb" # exclude help used only in gemspec
-    end
-
-    # On CI we publish simplecov results to codecov.io
-    if on_travis?
-      require "codecov"
-      SimpleCov.formatter = SimpleCov::Formatter::Codecov
-    end
+# Code coverage (via SimpleCov)
+begin
+  require "simplecov"
+  SimpleCov.start do
+    add_filter "/spec/"      # exclude test code
+    add_filter "/vendor/"    # exclude gems which are vendored on Travis CI
+    add_filter "/on_what.rb" # exclude help used only in gemspec
+  end
 
-    # Due to circular dependency (simplecov depends on docile), remove docile and require again below
-    Object.send(:remove_const, :Docile)
-    $LOADED_FEATURES.reject! { |f| f =~ /\/docile\// }
-  rescue LoadError
-    warn "warning: simplecov or codecov gems not found; skipping coverage"
+  # On CI we publish simplecov results to codecov.io
+  if on_travis?
+    require "codecov"
+    SimpleCov.formatter = SimpleCov::Formatter::Codecov
   end
+
+  # Due to circular dependency (simplecov depends on docile), remove docile and require again below
+  Object.send(:remove_const, :Docile)
+  $LOADED_FEATURES.reject! { |f| f =~ /\/docile\// }
+rescue LoadError
+  warn "warning: simplecov or codecov gems not found; skipping coverage"
 end
 
 lib_dir = File.join(File.dirname(File.dirname(__FILE__)), "lib")
 $LOAD_PATH.unshift lib_dir unless $LOAD_PATH.include? lib_dir
 
-# Require Docile again, now with coverage enabled on 1.9+
+# Require Docile again, now with coverage enabled
 require "docile"