diff --git a/Gemfile.lock b/Gemfile.lock
index 134f19a..7eff721 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -177,7 +177,7 @@ GEM
       nio4r (~> 2.0)
     rabl (0.14.2)
       activesupport (>= 2.3.14)
-    rack (2.2.2)
+    rack (2.2.3.1)
     rack-pjax (1.1.0)
       nokogiri (~> 1.5)
       rack (>= 1.1)