diff --git a/Gemfile.lock b/Gemfile.lock
index 89f5b30..2fe3ffd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -77,7 +77,7 @@ GEM
       thor
       thread_safe
     rainbow (3.0.0)
-    rdoc (6.2.1)
+    rdoc (6.3.1)
     regexp_parser (1.7.1)
     rexml (3.2.4)
     rspec (3.9.0)