diff --git a/Gemfile.lock b/Gemfile.lock
index 231ae78..b1175a8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,23 +10,23 @@ GEM
     diff-lcs (1.3)
     docile (1.3.2)
     json (2.2.0)
-    rake (12.3.2)
-    rdoc (6.1.1)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.2)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.4)
+    rake (13.0.0)
+    rdoc (6.2.0)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.0)
+      rspec-support (~> 3.9.0)
+    rspec-expectations (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.1)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.2)
-    simplecov (0.15.0)
-      docile (~> 1.1.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.0)
+    simplecov (0.17.1)
+      docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)