diff --git a/Gemfile.lock b/Gemfile.lock
index 9902ba8..47e0ec4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
     rake (13.0.1)
-    rdoc (6.1.1)
+    rdoc (6.3.2)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)