diff --git a/Gemfile.lock b/Gemfile.lock
index 1db814c..04cae41 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,9 +1,9 @@
 PATH
   remote: .
   specs:
-    tzu_mock (1.2.0)
+    tzu_mock (1.3.0)
       binding_of_caller (>= 0.7)
-      hashie (= 3.4.0)
+      hashie (~> 3)
 
 GEM
   remote: http://rubygems.org/
@@ -13,7 +13,7 @@ GEM
     byebug (11.1.3)
     debug_inspector (1.1.0)
     diff-lcs (1.5.0)
-    hashie (3.4.0)
+    hashie (3.6.0)
     rake (13.0.6)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
diff --git a/tzu_mock.gemspec b/tzu_mock.gemspec
index 828db6c..a78dc00 100644
--- a/tzu_mock.gemspec
+++ b/tzu_mock.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
 
   s.add_runtime_dependency 'binding_of_caller', '>= 0.7'
-  s.add_runtime_dependency 'hashie', '3.4.0'
+  s.add_runtime_dependency 'hashie', '~> 3'
 
   s.add_development_dependency 'tzu'
   s.add_development_dependency 'rspec'