diff --git a/Gemfile.lock b/Gemfile.lock
index 532a3ea..5a82f88 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -454,7 +454,7 @@ GEM
       ffi (>= 1.0.6)
       msgpack (>= 0.4.3)
       optimist (>= 3.0.0)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     redis (5.1.0)
       redis-client (>= 0.17.0)