diff --git a/.gitignore b/.gitignore
index 404abb2..1abe828 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,7 @@
+bin/
+!bin/git-generate-changelog
+!bin/github_changelog_generator
+pkg/
 coverage/
+.bundle
+spec/*.lock
diff --git a/.travis.yml b/.travis.yml
index c17e5d4..b171cfb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,11 @@
-sudo: false
+cache:
+  - bundler
 language: ruby
 before_install:
   - gem update --system
   - gem install bundler
 rvm:
-  - 2.1.0
+  - 2.1
 script: bundle exec rake checks
 matrix:
   include:
@@ -13,6 +14,10 @@ matrix:
       script:
         - gem build github_changelog_generator
         - gem install *.gem
+    - install: true
+      script:
+        - gem build github_changelog_generator
+        - bundle install --gemfile spec/install-gem-in-bundler.gemfile
 notifications:
   email:
     recipients:
diff --git a/Gemfile.lock b/Gemfile.lock
index 1f3be29..8bfbb1c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,10 +17,10 @@ GEM
     ast (2.2.0)
     childprocess (0.5.9)
       ffi (~> 1.0, >= 1.0.11)
-    codeclimate-test-reporter (0.4.8)
+    codeclimate-test-reporter (0.5.0)
       simplecov (>= 0.7.1, < 1.0.0)
     colorize (0.7.7)
-    coveralls (0.8.11)
+    coveralls (0.8.13)
       json (~> 1.8)
       simplecov (~> 0.11.0)
       term-ansicolor (~> 1.3)
@@ -61,12 +61,12 @@ GEM
     powerpack (0.1.1)
     rack (1.6.4)
     rainbow (2.1.0)
-    rake (10.5.0)
+    rake (11.0.1)
     rspec (3.4.0)
       rspec-core (~> 3.4.0)
       rspec-expectations (~> 3.4.0)
       rspec-mocks (~> 3.4.0)
-    rspec-core (3.4.3)
+    rspec-core (3.4.4)
       rspec-support (~> 3.4.0)
     rspec-expectations (3.4.0)
       diff-lcs (>= 1.2.0, < 2.0)
@@ -75,12 +75,12 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.4.0)
     rspec-support (3.4.1)
-    rubocop (0.37.2)
-      parser (>= 2.3.0.4, < 3.0)
+    rubocop (0.38.0)
+      parser (>= 2.3.0.6, < 3.0)
       powerpack (~> 0.1)
       rainbow (>= 1.99.1, < 3.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 0.3)
+      unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.7.5)
     simplecov (0.11.2)
       docile (~> 1.1.0)
@@ -92,7 +92,7 @@ GEM
     thor (0.19.1)
     thread_safe (0.3.5)
     tins (1.6.0)
-    unicode-display_width (0.3.1)
+    unicode-display_width (1.0.1)
 
 PLATFORMS
   ruby
diff --git a/spec/install-gem-in-bundler.gemfile b/spec/install-gem-in-bundler.gemfile
new file mode 100644
index 0000000..85493a9
--- /dev/null
+++ b/spec/install-gem-in-bundler.gemfile
@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem "github_changelog_generator", path: Dir.glob("../pkg/github_changelog_generator-*.gem")[0]