diff --git a/actionmailer/lib/action_mailer.rb b/actionmailer/lib/action_mailer.rb
index 5cf9f4d9a33406f4c97cbefa57096cc47a280103..2825d747075830ac6cecbc211afe6e9b488b7432 100755
--- a/actionmailer/lib/action_mailer.rb
+++ b/actionmailer/lib/action_mailer.rb
@@ -27,7 +27,7 @@
     require 'action_controller'
   rescue LoadError
     require 'rubygems'
-    require_gem 'actionpack', '>= 1.12.5'
+    gem 'actionpack', '>= 1.12.5'
   end
 end
 
diff --git a/actionpack/lib/action_controller.rb b/actionpack/lib/action_controller.rb
index 90c23604dbf12385a6615bcfa8ef08142c1a8c0a..4fb8542382f03cfc4ec482f2b19d75e699c4ebd9 100755
--- a/actionpack/lib/action_controller.rb
+++ b/actionpack/lib/action_controller.rb
@@ -30,7 +30,7 @@
     require 'active_support'
   rescue LoadError
     require 'rubygems'
-    require_gem 'activesupport'
+    gem 'activesupport'
   end
 end
 
diff --git a/actionpack/test/controller/assert_select_test.rb b/actionpack/test/controller/assert_select_test.rb
index 7056bfa08bdf51a2b89e728c368b96ee39b1cda7..f3b525ab92bf124caec7014654346f1fe22244e4 100644
--- a/actionpack/test/controller/assert_select_test.rb
+++ b/actionpack/test/controller/assert_select_test.rb
@@ -13,7 +13,7 @@
     require 'action_mailer'
   rescue LoadError
     require 'rubygems'
-    require_gem 'actionmailer'
+    gem 'actionmailer'
   end
 end
 
diff --git a/actionwebservice/lib/action_web_service.rb b/actionwebservice/lib/action_web_service.rb
index 874518e0b184f652b18ec11c40d914f440e5f0ae..0632dd1ec063b897f9122ea8eb20f0024776f13b 100644
--- a/actionwebservice/lib/action_web_service.rb
+++ b/actionwebservice/lib/action_web_service.rb
@@ -27,9 +27,9 @@
   require 'active_record'
 rescue LoadError
   require 'rubygems'
-  require_gem 'activesupport', '>= 1.0.2'
-  require_gem 'actionpack', '>= 1.6.0'
-  require_gem 'activerecord', '>= 1.9.0'
+  gem 'activesupport', '>= 1.0.2'
+  gem 'actionpack', '>= 1.6.0'
+  gem 'activerecord', '>= 1.9.0'
 end
 
 $:.unshift(File.dirname(__FILE__) + "/action_web_service/vendor/")
diff --git a/activerecord/benchmarks/benchmark.rb b/activerecord/benchmarks/benchmark.rb
index 241d91520876c41b9fa4e52d313627eff35ed3b0..de390c11b2a36b7d3cd8d862c31445cd0351805a 100644
--- a/activerecord/benchmarks/benchmark.rb
+++ b/activerecord/benchmarks/benchmark.rb
@@ -1,7 +1,7 @@
 $:.unshift(File.dirname(__FILE__) + '/../lib')
 if ARGV[2]
   require 'rubygems'
-  require_gem 'activerecord', ARGV[2]
+  gem 'activerecord', ARGV[2]
 else
   require 'active_record'
 end
diff --git a/activerecord/lib/active_record.rb b/activerecord/lib/active_record.rb
index 4bd5b6a1afbf876b2ab11be4d1049e590ee58873..c4a228053bfb28ab5fb48850eacb0297e2f67902 100755
--- a/activerecord/lib/active_record.rb
+++ b/activerecord/lib/active_record.rb
@@ -30,7 +30,7 @@
     require 'active_support'  
   rescue LoadError
     require 'rubygems'
-    require_gem 'activesupport'
+    gem 'activesupport'
   end
 end
 
diff --git a/activeresource/lib/active_resource.rb b/activeresource/lib/active_resource.rb
index 89fd6f7722ed42ece5e98acb4680e243cf244589..a1af676086ba0f27df033c76390496989a6e58cf 100644
--- a/activeresource/lib/active_resource.rb
+++ b/activeresource/lib/active_resource.rb
@@ -30,7 +30,7 @@
     require 'active_support'  
   rescue LoadError
     require 'rubygems'
-    require_gem 'activesupport'
+    gem 'activesupport'
   end
 end
 
diff --git a/railties/CHANGELOG b/railties/CHANGELOG
index f3f78d06066a364bd8fcefee2cd2ff0ccffe127a..2b7ef8f8dd326c9cfb7c3efa7e9c2efba6187566 100644
--- a/railties/CHANGELOG
+++ b/railties/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Fix gem deprecation warnings, which also means depending on RubyGems 0.9.0+ [Chad Fowler]
+
 * Plugins may be symlinked in vendor/plugins.  #4245 [brandon, progrium@gmail.com]
 
 * Resource generator depends on the model generator rather than duplicating it.  #7269 [bscofield]
diff --git a/railties/environments/boot.rb b/railties/environments/boot.rb
index 128fe764598479578e361f6d709a344d276e2d3d..1e2a641823aa2d37b8461f2136acf45402068a75 100644
--- a/railties/environments/boot.rb
+++ b/railties/environments/boot.rb
@@ -26,7 +26,7 @@
       rails_gem = Gem.cache.search('rails', "~>#{version}.0").sort_by { |g| g.version.version }.last
 
       if rails_gem
-        require_gem "rails", "=#{rails_gem.version.version}"
+        gem "rails", "=#{rails_gem.version.version}"
         require rails_gem.full_gem_path + '/lib/initializer'
       else
         STDERR.puts %(Cannot find gem for Rails ~>#{version}.0:
@@ -36,7 +36,7 @@
         exit 1
       end
     else
-      require_gem "rails"
+      gem "rails"
       require 'initializer'
     end
   end
diff --git a/railties/lib/rails_generator.rb b/railties/lib/rails_generator.rb
index 9c587c9552eb1f3818ac5b3f6f6dff0795407539..9f0ffc1562ccc4018c606b68007f3a0a428d02f4 100644
--- a/railties/lib/rails_generator.rb
+++ b/railties/lib/rails_generator.rb
@@ -28,7 +28,7 @@
   require 'active_support'  
 rescue LoadError
   require 'rubygems'
-  require_gem 'activesupport'
+  gem 'activesupport'
 end
 
 require 'rails_generator/base'