diff --git a/Gemfile.lock b/Gemfile.lock
index 24d6317..1ae36c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
       nio4r (~> 2.0)
     pygments.rb (1.2.1)
       multi_json (>= 1.0.0)
-    rack (2.2.2)
+    rack (2.2.3.1)
     rack-canonical-host (0.2.3)
       addressable (> 0, < 3)
       rack (>= 1.0.0, < 3)