diff --git a/Gemfile.lock b/Gemfile.lock
index 358a526..e27dafb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,36 +2,38 @@ GEM
   remote: https://rubygems.org/
   specs:
     base64 (0.2.0)
-    diff-lcs (1.5.1)
+    date (3.4.1)
+    diff-lcs (1.6.0)
     docile (1.1.5)
-    json (2.7.1)
-    psych (5.1.2)
+    json (2.10.2)
+    psych (5.2.3)
+      date
       stringio
-    rake (13.1.0)
-    rdoc (6.6.3.1)
+    rake (13.2.1)
+    rdoc (6.13.0)
       psych (>= 4.0.0)
-    redcarpet (3.6.0)
+    redcarpet (3.6.1)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
       rspec-mocks (~> 3.13.0)
-    rspec-core (3.13.0)
+    rspec-core (3.13.3)
       rspec-support (~> 3.13.0)
-    rspec-expectations (3.13.0)
+    rspec-expectations (3.13.3)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.0)
+    rspec-mocks (3.13.2)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-support (3.13.1)
+    rspec-support (3.13.2)
     simplecov (0.15.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    stringio (3.1.0)
+    stringio (3.1.5)
     syntax (1.2.2)
-    yard (0.9.36)
+    yard (0.9.37)
 
 PLATFORMS
   ruby