diff --git a/Gemfile.lock b/Gemfile.lock
index 60c423f..94919e2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -132,6 +132,7 @@ GEM
       thor (>= 0.19, < 2)
     diff-lcs (1.6.1)
     drb (2.2.1)
+    erb (5.0.1)
     erubi (1.13.1)
     et-orbi (1.2.11)
       tzinfo
@@ -295,7 +296,8 @@ GEM
     rainbow (3.1.1)
     rake (13.2.1)
     rdiscount (2.2.7.3)
-    rdoc (6.13.1)
+    rdoc (6.14.0)
+      erb
       psych (>= 4.0.0)
     redcarpet (3.6.1)
     regexp_parser (2.10.0)