diff --git a/Gemfile.lock b/Gemfile.lock
index 9c7c64bb..c7d27b43 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -152,7 +152,7 @@ GEM
     rake (13.0.6)
     rbs (2.0.0)
     rclconf (1.0.0)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     regexp_parser (2.9.0)
     reline (0.4.3)