diff --git a/.gitignore b/.gitignore
index b0739d3..dfb77a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,6 @@
 .config
 .yardoc
 bin/
-Gemfile.lock
 InstalledFiles
 _yardoc
 coverage
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..3d06a40
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,85 @@
+PATH
+  remote: .
+  specs:
+    yam (2.5.0)
+      addressable (~> 2.4)
+      multi_json (~> 1.8)
+      oauth2-client (~> 2.0)
+      oj (~> 2.14)
+      rest-client
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    bcrypt (3.1.16)
+    bcrypt-ruby (3.1.5)
+      bcrypt (>= 3.1.3)
+    coveralls (0.7.2)
+      multi_json (~> 1.3)
+      rest-client (= 1.6.7)
+      simplecov (>= 0.7)
+      term-ansicolor (= 1.2.2)
+      thor (= 0.18.1)
+    crack (0.4.5)
+      rexml
+    diff-lcs (1.4.4)
+    docile (1.4.0)
+    hashdiff (1.0.1)
+    mime-types (3.3.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2021.0225)
+    multi_json (1.15.0)
+    oauth2-client (2.0.0)
+      addressable (~> 2.3)
+      bcrypt-ruby (~> 3.0)
+    oj (2.18.5)
+    public_suffix (4.0.6)
+    rake (13.0.3)
+    rest-client (1.6.7)
+      mime-types (>= 1.16)
+    rexml (3.2.5)
+    rspec (3.10.0)
+      rspec-core (~> 3.10.0)
+      rspec-expectations (~> 3.10.0)
+      rspec-mocks (~> 3.10.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-support (3.10.2)
+    simplecov (0.21.2)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.3)
+    term-ansicolor (1.2.2)
+      tins (~> 0.8)
+    thor (0.18.1)
+    tins (0.13.2)
+    webmock (3.13.0)
+      addressable (>= 2.3.6)
+      crack (>= 0.3.2)
+      hashdiff (>= 0.4.0, < 2.0.0)
+    yard (0.9.26)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  coveralls
+  rake (~> 13)
+  rspec (>= 2.11)
+  simplecov
+  webmock (>= 1.22.0)
+  yam!
+  yard (~> 0.8, >= 0.8.7)
+
+BUNDLED WITH
+   2.1.4
diff --git a/yam.gemspec b/yam.gemspec
index f9d0bb7..7dbaca9 100644
--- a/yam.gemspec
+++ b/yam.gemspec
@@ -45,15 +45,13 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'oj', '~> 2.14'
   s.add_dependency 'multi_json', '~> 1.8'
-  s.add_dependency 'rest-client', '~> 1.8'
+  s.add_dependency 'rest-client'
   s.add_dependency 'addressable', '~> 2.4'
   s.add_dependency 'oauth2-client', '~> 2.0'
 
-  s.add_development_dependency 'rake', '~> 0'
+  s.add_development_dependency 'rake', '~> 13'
   s.add_development_dependency 'rspec', '~> 0'
   s.add_development_dependency 'simplecov', '~> 0.11.1'
   s.add_development_dependency 'webmock', '~> 1.17', '>= 1.17.0'
   s.add_development_dependency 'yard', '~> 0.8', '>= 0.8.7'
-
-  s.post_install_message = %q{ Thanks for installing! For API help go to http://developer.yammer.com }
 end