diff --git a/Gemfile.lock b/Gemfile.lock
index 9f5fedc59..0e0a0bd42 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -82,7 +82,7 @@ GEM
       concurrent-ruby (~> 1.0)
     io-console (0.5.11)
     io-like (0.3.1)
-    irb (1.4.3)
+    irb (1.5.1)
       reline (>= 0.3.0)
     json (2.6.2)
     matrix (0.4.2)