diff --git a/validates_timeliness.gemspec b/validates_timeliness.gemspec
index 127895a..2f0b31d 100644
--- a/validates_timeliness.gemspec
+++ b/validates_timeliness.gemspec
@@ -17,5 +17,5 @@ Gem::Specification.new do |s|
   s.test_files       = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.extra_rdoc_files = ["README.rdoc", "CHANGELOG.rdoc", "LICENSE"]
 
-  s.add_runtime_dependency(%q<timeliness>, ["~> 0.3.8"])
+  s.add_runtime_dependency(%q<timeliness>, ["~> 0.3.9"])
 end