diff --git a/Gemfile.lock b/Gemfile.lock
index 97075b6d3..520065ade 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -556,7 +556,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rb-readline (0.5.5)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     redis (5.0.8)
       redis-client (>= 0.17.0)