diff --git a/Gemfile.lock b/Gemfile.lock
index 0715a04d..b046e4af 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -360,7 +360,7 @@ GEM
     rainbow (3.1.1)
     rake (13.1.0)
     rbs (2.8.4)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     redcarpet (3.6.0)
     redis (4.8.1)