diff --git a/README.rdoc b/README.rdoc
index fbf1a52..76e0b98 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -11,7 +11,7 @@ handle spatial datatypes in the following databases:
 The following gems are required:
 
 - GeoRuby
-- ActiveRecord (version 2.2.2 and up)
+- ActiveRecord (version 3.2.0 and up)
 
 For PostgreSQL:
 
diff --git a/lib/spatial_adapter/mysql2.rb b/lib/spatial_adapter/mysql2.rb
index 0c0b8cc..b67d5c5 100644
--- a/lib/spatial_adapter/mysql2.rb
+++ b/lib/spatial_adapter/mysql2.rb
@@ -3,7 +3,7 @@
 require 'active_record/connection_adapters/mysql2_adapter'
 
 module ActiveRecord::ConnectionAdapters
-  class SpatialMysql2Column < Mysql2Column
+  class SpatialMysql2Column < Mysql2Adapter::Column
     include SpatialAdapter::SpatialColumn
     extend SpatialAdapter::Base::Mysql::SpatialColumn
   end
@@ -18,7 +18,7 @@ def columns(table_name, name = nil)#:nodoc:
           if field[1] =~ GEOMETRY_REGEXP
             ActiveRecord::ConnectionAdapters::SpatialMysql2Column
           else
-            ActiveRecord::ConnectionAdapters::Mysql2Column
+            ActiveRecord::ConnectionAdapters::Mysql2Adapter::Column
           end
         klass.new(field[0], field[4], field[1], field[2] == "YES")
       end
diff --git a/spatial_adapter.gemspec b/spatial_adapter.gemspec
index 07804c3..bf650f1 100644
--- a/spatial_adapter.gemspec
+++ b/spatial_adapter.gemspec
@@ -34,6 +34,6 @@ Gem::Specification.new do |s|
     s.add_development_dependency 'activerecord-jdbcmysql-adapter'
   end
 
-  s.add_dependency 'activerecord', '>= 2.2.2', '< 3.1.0'
+  s.add_dependency 'activerecord', '>= 3.2.0'
   s.add_dependency 'GeoRuby', '>= 1.3.0'
 end
diff --git a/spec/mysql2_spec.rb b/spec/mysql2_spec.rb
index bf0dbda..8e7b2a0 100644
--- a/spec/mysql2_spec.rb
+++ b/spec/mysql2_spec.rb
@@ -13,7 +13,7 @@
   it_should_behave_like 'a modified mysql adapter' do
     let(:establish){ mysql2_connection }
     let(:column) do
-      ActiveRecord::ConnectionAdapters::Mysql2Column
+      ActiveRecord::ConnectionAdapters::Mysql2Adapter::Column
     end
     let(:spatial_column) do
       ActiveRecord::ConnectionAdapters::SpatialMysql2Column