diff --git a/Gemfile.lock b/Gemfile.lock
index a53bf4e..a71564d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,10 +8,11 @@ GEM
   remote: https://rubygems.org/
   specs:
     diff-lcs (1.3)
-    docile (1.3.2)
-    json (2.2.0)
-    rake (13.0.0)
-    rdoc (6.2.0)
+    docile (1.1.5)
+    json (2.3.0)
+    rake (13.0.1)
+    rdoc (6.2.1)
+    redcarpet (3.5.0)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -24,13 +25,14 @@ GEM
     rspec-mocks (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
-    rspec-support (3.9.0)
-    simplecov (0.17.1)
-      docile (~> 1.1)
+    rspec-support (3.9.2)
+    simplecov (0.15.0)
+      docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    yard (0.9.20)
+    syntax (1.2.2)
+    yard (0.9.24)
 
 PLATFORMS
   ruby