diff --git a/Gemfile.lock b/Gemfile.lock
index 6318914..db049fd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
     public_suffix (6.0.2)
     racc (1.8.1)
     rainbow (3.1.1)
-    rdoc (7.0.3)
+    rdoc (7.1.0)
       erb
       psych (>= 4.0.0)
       tsort