diff --git a/Gemfile.lock b/Gemfile.lock
index 7e4eeb07c..1837ef28e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -470,7 +470,7 @@ GEM
       json (>= 1.8)
       nokogiri (~> 1.5)
       trollop (~> 2.1)
-    rdoc (6.0.3)
+    rdoc (6.3.1)
     ref (2.0.0)
     request_store (1.4.1)
       rack (>= 1.4)