diff --git a/Gemfile.lock b/Gemfile.lock
index aa8828f..43139d0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,7 +96,7 @@ GEM
     public_suffix (6.0.2)
     racc (1.8.1)
     rainbow (3.1.1)
-    rdoc (7.1.0)
+    rdoc (7.2.0)
       erb
       psych (>= 4.0.0)
       tsort