diff --git a/Gemfile.lock b/Gemfile.lock
index 05c14d1..4e65251 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -210,7 +210,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     redis (5.0.8)
       redis-client (>= 0.17.0)