diff --git a/winrm-elevated.gemspec b/winrm-elevated.gemspec
index a7eed8f..9b2152f 100644
--- a/winrm-elevated.gemspec
+++ b/winrm-elevated.gemspec
@@ -25,8 +25,8 @@ Gem::Specification.new do |s|
   s.extra_rdoc_files = %w(README.md LICENSE)
 
   s.required_ruby_version = '>= 1.9.0'
-  s.add_runtime_dependency 'winrm', '~> 1.3'
-  s.add_runtime_dependency 'winrm-fs', '~> 0.2.2'
+  s.add_runtime_dependency 'winrm', '>= 1.5'
+  s.add_runtime_dependency 'winrm-fs', '>= 0.2.0'
   s.add_development_dependency 'rspec', '~> 3.2'
   s.add_development_dependency 'rake', '~> 10.3'
   s.add_development_dependency 'rubocop', '~> 0.28'