diff --git a/client_side_validations-simple_form.gemspec b/client_side_validations-simple_form.gemspec
index 59c1111..e59ab5c 100644
--- a/client_side_validations-simple_form.gemspec
+++ b/client_side_validations-simple_form.gemspec
@@ -22,18 +22,18 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'client_side_validations', '~> 9.0'
   spec.add_dependency 'simple_form', '~> 3.4'
 
-  spec.add_development_dependency 'appraisal', '~> 2.1'
+  spec.add_development_dependency 'appraisal', '~> 2.2'
   spec.add_development_dependency 'byebug', '~> 9.0'
-  spec.add_development_dependency 'coveralls', '~> 0.8.19'
+  spec.add_development_dependency 'coveralls', '~> 0.8.20'
   spec.add_development_dependency 'm', '~> 1.5'
   spec.add_development_dependency 'minitest', '~> 5.10'
   spec.add_development_dependency 'mocha', '~> 1.2'
   spec.add_development_dependency 'rake', '~> 12.0'
-  spec.add_development_dependency 'rubocop', '~> 0.47.1'
-  spec.add_development_dependency 'simplecov', '~> 0.12.0'
+  spec.add_development_dependency 'rubocop', '~> 0.48.1'
+  spec.add_development_dependency 'simplecov', '~> 0.14.1'
 
   # For QUnit testing
-  spec.add_development_dependency 'sinatra', '~> 2.0.0.rc1'
+  spec.add_development_dependency 'sinatra', '~> 2.0.0.rc2'
   spec.add_development_dependency 'shotgun', '~> 0.9.2'
   spec.add_development_dependency 'thin', '~> 1.7'
   spec.add_development_dependency 'coffee-script', '~> 2.4'