diff --git a/Gemfile.lock b/Gemfile.lock
index 20f6616..3e31da1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,19 +32,19 @@ GEM
       concurrent-ruby (~> 1.0)
     minitest (5.21.2)
     mutex_m (0.2.0)
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.1)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.4)
+    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-support (~> 3.13.0)
+    rspec-expectations (3.13.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.3)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.2)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.0)
     ruby2_keywords (0.0.5)
     simplecov (0.22.0)
       docile (~> 1.1)