diff --git a/guard-puppet.gemspec b/guard-puppet.gemspec
index 46373ff..f3c681d 100644
--- a/guard-puppet.gemspec
+++ b/guard-puppet.gemspec
@@ -16,6 +16,6 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
 
-  s.add_dependency 'guard'
-  s.add_dependency 'puppet'
+  s.add_dependency 'guard', '~> 2.12'
+  s.add_dependency 'puppet', '~> 4.1'
 end