diff --git a/Gemfile.lock b/Gemfile.lock
index 602fb4b..a032ccb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,7 +89,7 @@ GEM
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     parallel (1.20.1)
-    parser (3.0.0.0)
+    parser (3.0.2.0)
       ast (~> 2.4.1)
     pry (0.14.0)
       coderay (~> 1.1)
@@ -112,8 +112,8 @@ GEM
       thor (~> 1.0)
     rainbow (3.0.0)
     rake (13.0.3)
-    regexp_parser (2.0.3)
-    rexml (3.2.4)
+    regexp_parser (2.1.1)
+    rexml (3.2.5)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -127,17 +127,17 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.10.0)
     rspec-support (3.10.0)
-    rubocop (1.9.1)
+    rubocop (1.18.4)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.2.0, < 2.0)
+      rubocop-ast (>= 1.8.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.4.1)
-      parser (>= 2.7.1.5)
+    rubocop-ast (1.8.0)
+      parser (>= 3.0.1.1)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.4)
     simplecov (0.21.2)