diff --git a/Gemfile.lock b/Gemfile.lock
index ed23bc5..ac0490f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,28 +6,28 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    bacon (1.1.0)
-    diff-lcs (1.1.3)
+    bacon (1.2.0)
+    diff-lcs (1.2.4)
     em-spec (0.2.6)
       bacon
       eventmachine
       rspec (> 2.6.0)
       test-unit
-    eventmachine (0.12.10)
-    rspec (2.9.0)
-      rspec-core (~> 2.9.0)
-      rspec-expectations (~> 2.9.0)
-      rspec-mocks (~> 2.9.0)
-    rspec-core (2.9.0)
-    rspec-expectations (2.9.1)
-      diff-lcs (~> 1.1.3)
-    rspec-mocks (2.9.0)
-    test-unit (2.4.4)
+    eventmachine (1.0.3)
+    rspec (2.13.0)
+      rspec-core (~> 2.13.0)
+      rspec-expectations (~> 2.13.0)
+      rspec-mocks (~> 2.13.0)
+    rspec-core (2.13.1)
+    rspec-expectations (2.13.0)
+      diff-lcs (>= 1.1.3, < 2.0)
+    rspec-mocks (2.13.1)
+    test-unit (2.5.4)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   em-spec
-  rspec (~> 2.9.0)
+  rspec
   signature!
diff --git a/signature.gemspec b/signature.gemspec
index 3217d5c..88e8fe4 100644
--- a/signature.gemspec
+++ b/signature.gemspec
@@ -18,6 +18,6 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_dependency "jruby-openssl" if defined?(JRUBY_VERSION)
-  s.add_development_dependency "rspec", "~> 2.9.0"
+  s.add_development_dependency "rspec"
   s.add_development_dependency "em-spec"
 end