diff --git a/Gemfile.lock b/Gemfile.lock
index b977435c96..a861fbc902 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,9 +105,9 @@ GEM
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     io-console (0.6.0)
-    irb (1.8.0)
-      rdoc (~> 6.5)
-      reline (>= 0.3.6)
+    irb (1.8.1)
+      rdoc
+      reline (>= 0.3.8)
     json (2.6.3)
     kramdown (2.4.0)
       rexml