diff --git a/dfb/Gemfile.lock b/dfb/Gemfile.lock
index 2fc3079..926f277 100644
--- a/dfb/Gemfile.lock
+++ b/dfb/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
     multi_json (1.14.1)
     multi_test (0.1.2)
     rake (13.0.1)
-    rdoc (6.2.0)
+    rdoc (6.3.2)
     rspec-expectations (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)