diff --git a/.travis.yml b/.travis.yml
index f9e8d547..06d92242 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,7 @@ gemfile:
   - Gemfile
   - gemfiles/Gemfile.rails-6.0-stable
   - gemfiles/Gemfile.rails-5.2-stable
+  - gemfiles/Gemfile.rails-5.1-stable
   - gemfiles/Gemfile.rails-5.0-stable
   - gemfiles/Gemfile.rails-4.2-stable
   - gemfiles/Gemfile.rails-4.1-stable
@@ -26,6 +27,8 @@ matrix:
       gemfile: gemfiles/Gemfile.rails-6.0-stable
     - rvm: 2.1.10
       gemfile: gemfiles/Gemfile.rails-5.2-stable
+    - rvm: 2.1.10
+      gemfile: gemfiles/Gemfile.rails-5.1-stable
     - rvm: 2.1.10
       gemfile: gemfiles/Gemfile.rails-5.0-stable
     - rvm: 2.2.10
@@ -54,6 +57,8 @@ matrix:
       gemfile: gemfiles/Gemfile.rails-4.2-stable
     - rvm: 2.7.1
       gemfile: gemfiles/Gemfile.rails-5.0-stable
+    - rvm: 2.7.1
+      gemfile: gemfiles/Gemfile.rails-5.1-stable
     - rvm: 2.7.1
       gemfile: gemfiles/Gemfile.rails-5.2-stable
     - rvm: ruby-head
@@ -64,6 +69,8 @@ matrix:
       gemfile: Gemfile
     - env: DEVISE_ORM=mongoid
       gemfile: gemfiles/Gemfile.rails-5.0-stable
+    - env: DEVISE_ORM=mongoid
+      gemfile: gemfiles/Gemfile.rails-5.1-stable
     - env: DEVISE_ORM=mongoid
       gemfile: gemfiles/Gemfile.rails-5.2-stable
     - env: DEVISE_ORM=mongoid
diff --git a/gemfiles/Gemfile.rails-5.1-stable b/gemfiles/Gemfile.rails-5.1-stable
new file mode 100644
index 00000000..70c21f0f
--- /dev/null
+++ b/gemfiles/Gemfile.rails-5.1-stable
@@ -0,0 +1,27 @@
+source "https://rubygems.org"
+
+gemspec path: ".."
+
+gem "rails", '~> 5.1.0'
+gem "omniauth"
+gem "omniauth-oauth2"
+gem "rdoc"
+
+gem "activemodel-serializers-xml", github: "rails/activemodel-serializers-xml"
+
+gem "rails-controller-testing"
+
+gem "responders", "~> 2.1"
+
+group :test do
+  gem "omniauth-facebook"
+  gem "omniauth-openid"
+  gem "timecop"
+  gem "webrat", "0.7.3", require: false
+  gem "mocha", "~> 1.1", require: false
+  gem 'test_after_commit', require: false
+end
+
+platforms :ruby do
+  gem "sqlite3", "~> 1.3.6"
+end
diff --git a/gemfiles/Gemfile.rails-5.1-stable.lock b/gemfiles/Gemfile.rails-5.1-stable.lock
new file mode 100644
index 00000000..a992f85d
--- /dev/null
+++ b/gemfiles/Gemfile.rails-5.1-stable.lock
@@ -0,0 +1,193 @@
+GIT
+  remote: https://github.com/rails/activemodel-serializers-xml.git
+  revision: 93689638c28525acc65afb638fce866826532641
+  specs:
+    activemodel-serializers-xml (1.0.2)
+      activemodel (>= 5.0.0.a)
+      activesupport (>= 5.0.0.a)
+      builder (~> 3.1)
+
+PATH
+  remote: ..
+  specs:
+    devise (4.7.1)
+      bcrypt (~> 3.0)
+      orm_adapter (~> 0.1)
+      railties (>= 4.1.0)
+      responders
+      warden (~> 1.2.3)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (5.1.7)
+      actionpack (= 5.1.7)
+      nio4r (~> 2.0)
+      websocket-driver (~> 0.6.1)
+    actionmailer (5.1.7)
+      actionpack (= 5.1.7)
+      actionview (= 5.1.7)
+      activejob (= 5.1.7)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.1.7)
+      actionview (= 5.1.7)
+      activesupport (= 5.1.7)
+      rack (~> 2.0)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (5.1.7)
+      activesupport (= 5.1.7)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (5.1.7)
+      activesupport (= 5.1.7)
+      globalid (>= 0.3.6)
+    activemodel (5.1.7)
+      activesupport (= 5.1.7)
+    activerecord (5.1.7)
+      activemodel (= 5.1.7)
+      activesupport (= 5.1.7)
+      arel (~> 8.0)
+    activesupport (5.1.7)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    arel (8.0.0)
+    bcrypt (3.1.13)
+    builder (3.2.4)
+    concurrent-ruby (1.1.6)
+    crass (1.0.6)
+    erubi (1.9.0)
+    faraday (1.0.1)
+      multipart-post (>= 1.2, < 3)
+    globalid (0.4.2)
+      activesupport (>= 4.2.0)
+    hashie (4.1.0)
+    i18n (1.8.3)
+      concurrent-ruby (~> 1.0)
+    jwt (2.2.1)
+    loofah (2.5.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    method_source (1.0.0)
+    mini_mime (1.0.2)
+    mini_portile2 (2.4.0)
+    minitest (5.14.1)
+    mocha (1.11.2)
+    multi_json (1.14.1)
+    multi_xml (0.6.0)
+    multipart-post (2.1.1)
+    nio4r (2.5.2)
+    nokogiri (1.10.9)
+      mini_portile2 (~> 2.4.0)
+    oauth2 (1.4.4)
+      faraday (>= 0.8, < 2.0)
+      jwt (>= 1.0, < 3.0)
+      multi_json (~> 1.3)
+      multi_xml (~> 0.5)
+      rack (>= 1.2, < 3)
+    omniauth (1.9.1)
+      hashie (>= 3.4.6)
+      rack (>= 1.6.2, < 3)
+    omniauth-facebook (6.0.0)
+      omniauth-oauth2 (~> 1.2)
+    omniauth-oauth2 (1.6.0)
+      oauth2 (~> 1.1)
+      omniauth (~> 1.9)
+    omniauth-openid (1.0.1)
+      omniauth (~> 1.0)
+      rack-openid (~> 1.3.1)
+    orm_adapter (0.5.0)
+    rack (2.2.2)
+    rack-openid (1.3.1)
+      rack (>= 1.1.0)
+      ruby-openid (>= 2.1.8)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails (5.1.7)
+      actioncable (= 5.1.7)
+      actionmailer (= 5.1.7)
+      actionpack (= 5.1.7)
+      actionview (= 5.1.7)
+      activejob (= 5.1.7)
+      activemodel (= 5.1.7)
+      activerecord (= 5.1.7)
+      activesupport (= 5.1.7)
+      bundler (>= 1.3.0)
+      railties (= 5.1.7)
+      sprockets-rails (>= 2.0.0)
+    rails-controller-testing (1.0.4)
+      actionpack (>= 5.0.1.x)
+      actionview (>= 5.0.1.x)
+      activesupport (>= 5.0.1.x)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (5.1.7)
+      actionpack (= 5.1.7)
+      activesupport (= 5.1.7)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.18.1, < 2.0)
+    rake (13.0.1)
+    rdoc (6.2.1)
+    responders (2.4.1)
+      actionpack (>= 4.2.0, < 6.0)
+      railties (>= 4.2.0, < 6.0)
+    ruby-openid (2.9.2)
+    sprockets (4.0.1)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    sqlite3 (1.3.13)
+    test_after_commit (1.1.0)
+      activerecord (>= 3.2)
+    thor (1.0.1)
+    thread_safe (0.3.6)
+    timecop (0.9.1)
+    tzinfo (1.2.7)
+      thread_safe (~> 0.1)
+    warden (1.2.8)
+      rack (>= 2.0.6)
+    webrat (0.7.3)
+      nokogiri (>= 1.2.0)
+      rack (>= 1.0)
+      rack-test (>= 0.5.3)
+    websocket-driver (0.6.5)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activemodel-serializers-xml!
+  devise!
+  mocha (~> 1.1)
+  omniauth
+  omniauth-facebook
+  omniauth-oauth2
+  omniauth-openid
+  rails (~> 5.1.0)
+  rails-controller-testing
+  rdoc
+  responders (~> 2.1)
+  sqlite3 (~> 1.3.6)
+  test_after_commit
+  timecop
+  webrat (= 0.7.3)
+
+BUNDLED WITH
+   1.17.3