diff --git a/Gemfile b/Gemfile
index fa63659a8d..f2ea1ec0dd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -36,5 +36,5 @@ end
 # `bundle config set --local without rdoc`
 # Then re-run `bundle install`.
 group :rdoc do
-  gem "rdoc", "6.7.0"
+  gem "rdoc", "6.8.1"
 end