diff --git a/Gemfile.lock b/Gemfile.lock
index 68c032f..0789ccb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -59,7 +59,8 @@ GEM
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     io-console (0.8.0)
-    irb (1.14.3)
+    irb (1.15.1)
+      pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     json (2.9.1)
@@ -106,7 +107,10 @@ GEM
     parser (3.3.7.0)
       ast (~> 2.4.1)
       racc
-    psych (5.2.2)
+    pp (0.6.2)
+      prettyprint
+    prettyprint (0.2.0)
+    psych (5.2.3)
       date
       stringio
     public_suffix (6.0.1)
@@ -124,7 +128,7 @@ GEM
       rack (>= 1.3)
     rainbow (3.1.1)
     rake (13.2.1)
-    rdoc (6.10.0)
+    rdoc (6.11.0)
       psych (>= 4.0.0)
     regexp_parser (2.10.0)
     reline (0.6.0)