diff --git a/Gemfile.lock b/Gemfile.lock
index e257b5dd..be10064d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,31 +1,56 @@
 PATH
   remote: .
   specs:
-    paper_trail (1.6.5)
-      actionpack (~> 2.3)
-      activerecord (~> 2.3)
+    paper_trail (2.0.0)
+      actionpack (~> 3)
+      activerecord (~> 3)
 
 GEM
   remote: http://rubygems.org/
   specs:
-    actionpack (2.3.10)
-      activesupport (= 2.3.10)
-      rack (~> 1.1.0)
-    activerecord (2.3.10)
-      activesupport (= 2.3.10)
-    activesupport (2.3.10)
-    rack (1.1.0)
+    abstract (1.0.0)
+    actionpack (3.0.3)
+      activemodel (= 3.0.3)
+      activesupport (= 3.0.3)
+      builder (~> 2.1.2)
+      erubis (~> 2.6.6)
+      i18n (~> 0.4)
+      rack (~> 1.2.1)
+      rack-mount (~> 0.6.13)
+      rack-test (~> 0.5.6)
+      tzinfo (~> 0.3.23)
+    activemodel (3.0.3)
+      activesupport (= 3.0.3)
+      builder (~> 2.1.2)
+      i18n (~> 0.4)
+    activerecord (3.0.3)
+      activemodel (= 3.0.3)
+      activesupport (= 3.0.3)
+      arel (~> 2.0.2)
+      tzinfo (~> 0.3.23)
+    activesupport (3.0.3)
+    arel (2.0.7)
+    builder (2.1.2)
+    erubis (2.6.6)
+      abstract (>= 1.0.0)
+    i18n (0.5.0)
+    rack (1.2.1)
+    rack-mount (0.6.13)
+      rack (>= 1.0.0)
+    rack-test (0.5.7)
+      rack (>= 1.0)
     rake (0.8.7)
     shoulda (2.10.3)
     sqlite3-ruby (1.3.1)
+    tzinfo (0.3.24)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  actionpack (~> 2.3)
-  activerecord (~> 2.3)
-  activesupport (~> 2.3)
+  actionpack (~> 3)
+  activerecord (~> 3)
+  activesupport (~> 3)
   bundler (~> 1.0)
   paper_trail!
   rake (= 0.8.7)
diff --git a/paper_trail.gemspec b/paper_trail.gemspec
index 9480a103..315ceea8 100644
--- a/paper_trail.gemspec
+++ b/paper_trail.gemspec
@@ -19,12 +19,12 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'bundler',       '~> 1.0'
   s.add_development_dependency 'rake',          '0.8.7'  # TODO: why do we need to list rake?
   s.add_development_dependency 'shoulda',       '2.10.3'
-  s.add_development_dependency 'activesupport', '~> 2.3'
+  s.add_development_dependency 'activesupport', '~> 3'
   s.add_development_dependency 'sqlite3-ruby',  '~> 1.2'
   # Repeated here to make bundler happy
-  s.add_development_dependency 'activerecord',  '~> 2.3'
-  s.add_development_dependency 'actionpack',    '~> 2.3'
+  s.add_development_dependency 'activerecord',  '~> 3'
+  s.add_development_dependency 'actionpack',    '~> 3'
 
-  s.add_dependency 'activerecord',  '~> 2.3'
-  s.add_dependency 'actionpack',    '~> 2.3'
+  s.add_dependency 'activerecord',  '~> 3'
+  s.add_dependency 'actionpack',    '~> 3'
 end