diff --git a/.travis.yml b/.travis.yml
index 573413e..6978cc5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,3 +5,6 @@ rvm:
 env:
   - CI=true
 before_install: gem install bundler -v 1.15.2
+gemfile:
+  - graphql-1.7.gemfile
+  - graphql-1.8.gemfile
diff --git a/Gemfile b/Gemfile
index 3d9907a..eb8abb3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,9 +1,6 @@
 source "https://rubygems.org"
 
-git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
-
 gem "pry"
-gem 'coveralls', require: false
 
 # Specify your gem's dependencies in graphql-guard.gemspec
 gemspec
diff --git a/graphql-1.7.gemfile b/graphql-1.7.gemfile
new file mode 100644
index 0000000..e24d295
--- /dev/null
+++ b/graphql-1.7.gemfile
@@ -0,0 +1,8 @@
+source "https://rubygems.org"
+
+gem "pry"
+gem 'coveralls'
+
+gem "graphql", "~> 1.7.14"
+
+gemspec
diff --git a/graphql-1.8.gemfile b/graphql-1.8.gemfile
new file mode 100644
index 0000000..b258127
--- /dev/null
+++ b/graphql-1.8.gemfile
@@ -0,0 +1,8 @@
+source "https://rubygems.org"
+
+gem "pry"
+gem 'coveralls'
+
+gem "graphql", "~> 1.8.4"
+
+gemspec