diff --git a/Gemfile.lock b/Gemfile.lock
index 2c3e517..6e1b5a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -109,7 +109,7 @@ GEM
     rake (13.1.0)
     rake-compiler (1.2.7)
       rake
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     regexp_parser (2.9.0)
     reline (0.4.3)