diff --git a/Gemfile.lock b/Gemfile.lock
index 63ce74d..0cfb00d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -187,19 +187,19 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    regexp_parser (1.7.1)
+    regexp_parser (1.8.0)
     rexml (3.2.4)
     rouge (3.23.0)
-    rubocop (0.90.0)
+    rubocop (0.91.0)
       parallel (~> 1.10)
       parser (>= 2.7.1.1)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.7)
       rexml
-      rubocop-ast (>= 0.3.0, < 1.0)
+      rubocop-ast (>= 0.4.0, < 1.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (0.3.0)
+    rubocop-ast (0.4.2)
       parser (>= 2.7.1.4)
     ruby-enum (0.8.0)
       i18n