diff --git a/Gemfile.lock b/Gemfile.lock
index 351b5be277..b977435c96 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,7 +105,8 @@ GEM
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     io-console (0.6.0)
-    irb (1.7.4)
+    irb (1.8.0)
+      rdoc (~> 6.5)
       reline (>= 0.3.6)
     json (2.6.3)
     kramdown (2.4.0)
@@ -161,6 +162,8 @@ GEM
     pry-byebug (3.10.1)
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
+    psych (5.1.0)
+      stringio
     public_suffix (5.0.3)
     racc (1.7.1)
     rack (2.2.6.4)
@@ -169,8 +172,10 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rdoc (6.5.0)
+      psych (>= 4.0.0)
     regexp_parser (2.8.1)
-    reline (0.3.6)
+    reline (0.3.8)
       io-console (~> 0.5)
     rexml (3.2.6)
     rgl (0.5.10)
@@ -203,6 +208,7 @@ GEM
       faraday (>= 0.17.3, < 3)
     servolux (0.13.0)
     stream (0.5.5)
+    stringio (3.0.8)
     sysexits (1.2.0)
     temple (0.10.2)
     terser (1.1.13)