diff --git a/Gemfile.lock b/Gemfile.lock
index d925687..851f075 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,7 +70,7 @@ GEM
       thor (~> 1.0)
     concurrent-ruby (1.1.9)
     crass (1.0.6)
-    debug (1.2.1)
+    debug (1.2.4)
       irb (>= 1.3.6)
       reline (>= 0.2.7)
     diff-lcs (1.4.4)