diff --git a/Gemfile.lock b/Gemfile.lock
index 33d5098..75a6f3f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,12 +9,13 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.3)
-    date (3.4.1)
+    date (3.5.1)
     diff-lcs (1.6.2)
-    erb (5.0.1)
-    io-console (0.8.0)
-    irb (1.15.2)
+    erb (5.1.3)
+    io-console (0.8.2)
+    irb (1.18.0)
       pp (>= 0.6.0)
+      prism (>= 1.3.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     json (2.13.2)
@@ -25,21 +26,22 @@ GEM
     parser (3.3.9.0)
       ast (~> 2.4.1)
       racc
-    pp (0.6.2)
+    pp (0.6.3)
       prettyprint
     prettyprint (0.2.0)
     prism (1.5.1)
-    psych (5.2.6)
+    psych (5.3.1)
       date
       stringio
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.3.0)
-    rdoc (6.14.0)
+    rdoc (6.17.0)
       erb
       psych (>= 4.0.0)
+      tsort
     regexp_parser (2.11.2)
-    reline (0.6.1)
+    reline (0.6.3)
       io-console (~> 0.5)
     rspec (3.13.1)
       rspec-core (~> 3.13.0)
@@ -85,9 +87,10 @@ GEM
     standard-performance (1.8.0)
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.25.0)
-    stringio (3.1.7)
+    stringio (3.2.0)
     test-prof (1.4.4)
     thor (1.3.2)
+    tsort (0.2.0)
     unicode-display_width (3.2.0)
       unicode-emoji (~> 4.1)
     unicode-emoji (4.1.0)