diff --git a/.gitignore b/.gitignore
index ef39f3e..5ba07db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,5 @@ activeresource-2.3.5.gem
 /activeresource-3.2.12.gem
 /activeresource-3.2.13-tests.tgz
 /activeresource-3.2.13.gem
+/activeresource-4.0.0-tests.tgz
+/activeresource-4.0.0.gem
diff --git a/MIT-LICENSE b/MIT-LICENSE
new file mode 100644
index 0000000..9a686a9
--- /dev/null
+++ b/MIT-LICENSE
@@ -0,0 +1,20 @@
+Copyright (c) 2006-2013 David Heinemeier Hansson
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/rubygem-activeresource.spec b/rubygem-activeresource.spec
index 6dd55ef..5e494d0 100644
--- a/rubygem-activeresource.spec
+++ b/rubygem-activeresource.spec
@@ -5,30 +5,36 @@
 Summary: Active Record for web resources
 Name: rubygem-%{gem_name}
 Epoch: 1
-Version: 3.2.13
-Release: 2%{?dist}
+Version: 4.0.0
+Release: 1%{?dist}
 Group: Development/Languages
 License: MIT
 URL: http://www.rubyonrails.org
-
 Source0: http://rubygems.org/downloads/activeresource-%{version}.gem
 
 # Also the activeresource gem doesn't ship with the test suite.
 # You may check it out like so
-# git clone http://github.com/rails/rails.git
-# cd rails/activeresource/
-# git checkout v3.2.13
-# tar czvf activeresource-3.2.13-tests.tgz test/
+# git clone https://github.com/rails/activeresource.git
+# cd activeresource/
+# git checkout v4.0.0
+# tar czvf activeresource-4.0.0-tests.tgz test/
 Source1: activeresource-%{version}-tests.tgz
 
+# License file from the git repo
+Source2: MIT-LICENSE
+
 # Let's keep Requires and BuildRequires sorted alphabeticaly
 Requires: ruby(release)
 Requires: ruby(rubygems)
 Requires: rubygem(activemodel) = %{version}
 Requires: rubygem(activesupport) = %{version}
+Requires: rubygem(rails-observers) >= 0.1.1
+Requires: rubygem(rails-observers) < 0.2.0
 BuildRequires: rubygems-devel
 BuildRequires: rubygem(activemodel) = %{version}
 BuildRequires: rubygem(activesupport) = %{version}
+BuildRequires: rubygem(rails-observers) >= 0.1.1
+BuildRequires: rubygem(rails-observers) < 0.2.0
 BuildRequires: rubygem(minitest)
 BuildRequires: rubygem(mocha)
 BuildArch: noarch
@@ -50,6 +56,9 @@ Documentation for %{name}
 %setup -q -c -T
 %gem_install -n %{SOURCE0}
 
+# Move license into place
+cp %{SOURCE2} .%{gem_instdir}/MIT-LICENSE
+
 %build
 
 %install
@@ -91,13 +100,11 @@ popd
 
 %files doc
 %doc %{gem_docdir}
-%doc %{gem_instdir}/CHANGELOG.md
-%doc %{gem_instdir}/examples
 %doc %{gem_instdir}/README.rdoc
 
 %changelog
-* Sun Aug 04 2013 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1:3.2.13-2
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_20_Mass_Rebuild
+* Tue Jul 30 2013 Josef Stribny <jstribny@redhat.com> - 1:4.0.0-1
+- Update to ActiveResource 4.0.0.
 
 * Tue Mar 19 2013 Vít Ondruch <vondruch@redhat.com> - 1:3.2.13-1
 - Update to ActiveResource 3.2.13.
diff --git a/sources b/sources
index 01b91d8..8c38500 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-65220fd0f78f394e6c80709085a743d2  activeresource-3.2.13-tests.tgz
-6c6375bee50bf4ebe94956fca8ff09b7  activeresource-3.2.13.gem
+f99d30eaa5dc9493f7b04e6d140ad4cb  activeresource-4.0.0-tests.tgz
+bade136345b4dec8ffd3589cfd5dbae8  activeresource-4.0.0.gem