diff --git a/.travis.yml b/.travis.yml
index 3ce22eaf7..fcef899fb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ rvm:
   - 2.4
   - 2.5
   - 2.6
+  - 2.7
   - jruby-head
 matrix:
   include:
diff --git a/solargraph.gemspec b/solargraph.gemspec
index a1a0d610e..6e2e5d2dd 100755
--- a/solargraph.gemspec
+++ b/solargraph.gemspec
@@ -30,6 +30,9 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'thor', '~> 1.0'
   s.add_runtime_dependency 'tilt', '~> 2.0'
   s.add_runtime_dependency 'yard', '~> 0.9'
+  s.add_runtime_dependency 'e2mmap'
+  s.add_runtime_dependency 'irb', '<= 1.1.0'
+  s.add_runtime_dependency 'benchmark'
 
   s.add_development_dependency 'pry', '~> 0.11.3'
   s.add_development_dependency 'rspec', '~> 3.5', '>= 3.5.0'