diff --git a/outliner.gemspec b/outliner.gemspec
index 06d2ec0..58d8b9e 100644
--- a/outliner.gemspec
+++ b/outliner.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "httparty", "~> 0.17"
 
   spec.add_development_dependency "bundler", "~> 2.0"
-  spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "webmock", "~> 3.6.0"
-  spec.add_development_dependency "minitest", "~> 5.8.4"
+  spec.add_dependency "rake", ">= 12.3"
+  spec.add_development_dependency "webmock", "~> 3.6"
+  spec.add_development_dependency "minitest", "~> 5.8"
 end