diff --git a/lib/noosfero/core_ext/active_record.rb b/lib/noosfero/core_ext/active_record.rb
index 4935efa..d1a1637 100644
--- a/lib/noosfero/core_ext/active_record.rb
+++ b/lib/noosfero/core_ext/active_record.rb
@@ -1,3 +1,5 @@
+require 'active_record'
+
 class ActiveRecord::Base
 
   def self.postgresql?
diff --git a/lib/tasks/env.rake b/lib/tasks/env.rake
deleted file mode 100644
index 9ebdcb5..0000000
--- a/lib/tasks/env.rake
+++ /dev/null
@@ -1 +0,0 @@
-require File.join(File.dirname(__FILE__), '../../config/environment.rb')
diff --git a/lib/tasks/gettext.rake b/lib/tasks/gettext.rake
index bf5fddd..0eff471 100644
--- a/lib/tasks/gettext.rake
+++ b/lib/tasks/gettext.rake
@@ -2,8 +2,6 @@
 # Added for Ruby-GetText-Package
 #
 
-require 'noosfero'
-
 makemo_stamp = 'tmp/makemo.stamp'
 desc "Create mo-files for L10n"
 task :makemo => makemo_stamp
@@ -40,6 +38,8 @@ end
 desc "Update pot/po files to match new version."
 task :updatepo do
   require 'gettext_rails/tools'
+  require 'noosfero'
+
   GetText::RubyParser::ID << '__'
   GetText::RubyParser::PLURAL_ID << 'n__'
   GetText::ActiveRecordParser.init(:use_classname => false)
diff --git a/lib/tasks/package.rake b/lib/tasks/package.rake
index 08c2c52..35dadd9 100644
--- a/lib/tasks/package.rake
+++ b/lib/tasks/package.rake
@@ -1,7 +1,7 @@
-require 'noosfero'
 
 desc "Generate source tarball"
 task :package => 'package:clobber' do
+  require 'noosfero'
   begin
     sh 'test -d .git'
   rescue
diff --git a/lib/tasks/release.rake b/lib/tasks/release.rake
index 23f1b77..39b5e41 100644
--- a/lib/tasks/release.rake
+++ b/lib/tasks/release.rake
@@ -9,7 +9,11 @@ namespace :noosfero do
     end
   end
 
-  version = Noosfero::VERSION
+  def version
+    require 'noosfero'
+    Noosfero::VERSION
+  end
+
   desc 'checks if there is already a tag for the current version'
   task :check_tag do
     sh "git tag | grep '^#{version}$' >/dev/null" do |ok, res|
@@ -23,9 +27,9 @@ namespace :noosfero do
   desc 'checks the version of the Debian package'
   task :check_debian_package do
     debian_version = `dpkg-parsechangelog | grep Version: | cut -d ' ' -f 2`.strip
-    unless debian_version =~ /^#{Noosfero::VERSION}/
-      puts "Version mismatch: Debian version = #{debian_version}, Noosfero upstream version = #{Noosfero::VERSION}"
-      puts "Run `dch -v #{Noosfero::VERSION}` to add a new changelog entry that upgrades the Debian version"
+    unless debian_version =~ /^#{version}/
+      puts "Version mismatch: Debian version = #{debian_version}, Noosfero upstream version = #{version}"
+      puts "Run `dch -v #{version}` to add a new changelog entry that upgrades the Debian version"
       raise "Version mismatch between noosfero version and debian package version"
     end
   end
diff --git a/lib/tasks/version.rake b/lib/tasks/version.rake
index 50339b1..43cbaeb 100644
--- a/lib/tasks/version.rake
+++ b/lib/tasks/version.rake
@@ -1,5 +1,5 @@
-require 'noosfero'
 desc "shows noosfero version"
 task :version do
+  require 'noosfero'
   puts "noosfero, version #{Noosfero::VERSION}"
 end
--
libgit2 0.21.2