diff --git a/ember-cli-rails.gemspec b/ember-cli-rails.gemspec
index 92b6f18a..4f637db2 100644
--- a/ember-cli-rails.gemspec
+++ b/ember-cli-rails.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "terrapin", ">= 0.6.0", "< 2.0"
   spec.add_dependency "html_page", "~> 0.1.0"
 
-  spec.add_development_dependency "generator_spec", "~> 0.9.0"
+  spec.add_development_dependency "generator_spec", ">= 0.9.0", "< 1.0"
   spec.add_development_dependency "rspec-rails", ">= 3.6.0", "< 9.0"
 
   spec.add_development_dependency "capybara-selenium"