diff --git a/Gemfile.lock b/Gemfile.lock
index 4598c88..e4d34bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -56,7 +56,7 @@ GEM
     racc (1.7.1)
     rainbow (3.1.1)
     rake (13.0.6)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     regexp_parser (2.8.1)
     reline (0.4.2)