diff --git a/facter.gemspec b/facter.gemspec
index b7d7abbc38..8ff4deb55d 100644
--- a/facter.gemspec
+++ b/facter.gemspec
@@ -42,7 +42,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-performance', '~> 1.5.2'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.10' # last version to support 2.5
   spec.add_development_dependency 'simplecov', '~> 0.17.1'
-  spec.add_development_dependency 'sys-filesystem', ['>= 1.4.0', '<= 1.5.0']
+  spec.add_development_dependency 'sys-filesystem', '~> 1.4'
   spec.add_development_dependency 'webmock', '~> 3.12'
   spec.add_development_dependency 'yard', '~> 0.9'