diff --git a/.gitignore b/.gitignore
index 7ae5b54..b236e19 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ tmtags
 ## PROJECT::GENERAL
 coverage
 rdoc
+Gemfile.lock
 pkg/*
 *.gem
 .bundle
diff --git a/Gemfile b/Gemfile
index 0a5465e..d1715ca 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,8 +2,3 @@ source 'http://rubygems.org/'
 
 # Specify your gem's dependencies in time_ext.gemspec
 gemspec
-
-group :development do
-  gem 'rspec', '>= 2.1.0'
-  gem 'yard', '>= 0.6.3'
-end
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index f6dec94..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,32 +0,0 @@
-PATH
-  remote: .
-  specs:
-    time_ext (0.2.7)
-      activesupport (>= 2.3.0)
-      i18n (>= 0.4.2)
-
-GEM
-  remote: http://rubygems.org/
-  specs:
-    activesupport (3.0.3)
-    diff-lcs (1.1.2)
-    i18n (0.4.2)
-    rspec (2.1.0)
-      rspec-core (~> 2.1.0)
-      rspec-expectations (~> 2.1.0)
-      rspec-mocks (~> 2.1.0)
-    rspec-core (2.1.0)
-    rspec-expectations (2.1.0)
-      diff-lcs (~> 1.1.2)
-    rspec-mocks (2.1.0)
-    yard (0.6.3)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activesupport (>= 2.3.0)
-  i18n (>= 0.4.2)
-  rspec (>= 2.1.0)
-  time_ext!
-  yard (>= 0.6.3)
diff --git a/README.md b/README.md
index b3a3228..0782324 100644
--- a/README.md
+++ b/README.md
@@ -99,5 +99,5 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
 [as]: http://as.rubyonrails.org/classes/ActiveSupport/CoreExtensions/Time/Calculations.html
-[docs]: http://rdoc.info/projects/jimeh/time_ext
+[docs]: http://rdoc.info/gems/time_ext/frames
 [rdoc.info]: http://rdoc.info/
\ No newline at end of file
diff --git a/lib/time_ext.rb b/lib/time_ext.rb
index 3544f1e..73b975e 100644
--- a/lib/time_ext.rb
+++ b/lib/time_ext.rb
@@ -1,8 +1,4 @@
 require 'rubygems'
-require 'active_support'
-
-# support both Active Support 2.x and 3.x
-require 'active_support/time' if !Time.respond_to?(:days_in_month)
 
 require 'time_ext/calculations'
 require 'time_ext/iterations'
diff --git a/lib/time_ext/core_ext/numeric.rb b/lib/time_ext/core_ext/numeric.rb
index e7c112c..5f31973 100644
--- a/lib/time_ext/core_ext/numeric.rb
+++ b/lib/time_ext/core_ext/numeric.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/numeric/time' unless Numeric.new.respond_to?(:seconds) # fixes rare loading issue
+
 class Numeric
   alias :sec :seconds
   alias :min :minutes
diff --git a/lib/time_ext/core_ext/time.rb b/lib/time_ext/core_ext/time.rb
index aa5c599..c3ca9ed 100644
--- a/lib/time_ext/core_ext/time.rb
+++ b/lib/time_ext/core_ext/time.rb
@@ -1,3 +1,7 @@
+require 'active_support'
+require 'active_support/time' unless Time.respond_to?(:days_in_month) # support both Active Support 2.x and 3.x
+require 'active_support/core_ext/time/calculations' unless Time.new.respond_to?(:ago) # fixes rare loading issue
+
 class Time
   include TimeExt::Support
   include TimeExt::Calculations
diff --git a/lib/time_ext/version.rb b/lib/time_ext/version.rb
index 4f22656..b9f91fd 100644
--- a/lib/time_ext/version.rb
+++ b/lib/time_ext/version.rb
@@ -1,3 +1,3 @@
 module TimeExt
-  VERSION = "0.2.8"
+  VERSION = "0.2.9"
 end
diff --git a/time_ext.gemspec b/time_ext.gemspec
index 8bf27f0..fc32bd8 100644
--- a/time_ext.gemspec
+++ b/time_ext.gemspec
@@ -19,6 +19,11 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
   
-  s.add_runtime_dependency 'activesupport', '>= 2.3.0'
+  s.add_runtime_dependency 'activesupport', '>= 2.3.2'
   s.add_runtime_dependency 'i18n', '>= 0.4.2'
+  
+  s.add_development_dependency 'rake', '>= 0.8.7'
+  s.add_development_dependency 'rspec', '>= 2.1.0'
+  s.add_development_dependency 'yard', '>= 0.6.3'
+  s.add_development_dependency 'ruby-debug'
 end