diff --git a/Gemfile.lock b/Gemfile.lock
index a529c6e..e2ed968 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -195,7 +195,7 @@ GEM
     rainbow (3.1.1)
     rake (13.1.0)
     rb_sys (0.9.87)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     regexp_parser (2.9.0)
     reline (0.4.3)