diff --git a/Gemfile.lock b/Gemfile.lock
index d55bb44515..af12924e6f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,11 +10,13 @@ GEM
     ast (2.4.3)
     benchmark (0.5.0)
     benchmark-ips (2.14.0)
+    cgi (0.5.1)
     coderay (1.1.3)
     concurrent-ruby (1.3.6)
     date (3.5.1)
     docile (1.4.1)
-    erb (6.0.1)
+    erb (4.0.4)
+      cgi (>= 0.3.3)
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     io-console (0.8.2)
@@ -46,7 +48,7 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.3.1)
-    rdoc (7.0.3)
+    rdoc (7.1.0)
       erb
       psych (>= 4.0.0)
       tsort