diff --git a/Gemfile.lock b/Gemfile.lock
index 163587d..dd95d6a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
       concurrent-ruby (~> 1.0)
     minitest (5.11.1)
     rake (13.0.1)
-    rdoc (6.0.1)
+    rdoc (6.3.2)
     shoulda (3.5.0)
       shoulda-context (~> 1.0, >= 1.0.1)
       shoulda-matchers (>= 1.4.1, < 3.0)