diff --git a/puppet-editor-services.gemspec b/puppet-editor-services.gemspec
index 6332be62..f736b1b4 100644
--- a/puppet-editor-services.gemspec
+++ b/puppet-editor-services.gemspec
@@ -20,10 +20,10 @@ Gem::Specification.new do |s|
                               'bin/*',
                               '[A-Z]*'].to_a
   s.license        = 'Apache-2.0'
-  s.add_runtime_dependency 'puppet-lint'
-  s.add_runtime_dependency 'hiera-eyaml'
-  s.add_runtime_dependency 'puppetfile-resolver'
-  s.add_runtime_dependency 'molinillo'
-  s.add_runtime_dependency 'puppet-strings'
-  s.add_runtime_dependency 'yard'
+  s.add_runtime_dependency 'puppet-lint', '~> 4.0'
+  s.add_runtime_dependency 'hiera-eyaml', '~> 2.1'
+  s.add_runtime_dependency 'puppetfile-resolver', '~> 0.6'
+  s.add_runtime_dependency 'molinillo', '~> 0.6'
+  s.add_runtime_dependency 'puppet-strings', '~> 4.0'
+  s.add_runtime_dependency 'yard', '~> 0.9'
 end