diff --git a/google-apis-generator/google-apis-generator.gemspec b/google-apis-generator/google-apis-generator.gemspec
index fd6e311ee..e1621702e 100644
--- a/google-apis-generator/google-apis-generator.gemspec
+++ b/google-apis-generator/google-apis-generator.gemspec
@@ -22,5 +22,5 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = ">= 2.0"
   gem.add_runtime_dependency "activesupport", ">= 4.1.16"
   gem.add_runtime_dependency "google-apis-core", "~> 0.1"
-  gem.add_runtime_dependency "thor", ">= 0.20", "< 2.a"
+  gem.add_runtime_dependency "thor", "~> 1.1.0"
 end