diff --git a/Gemfile.lock b/Gemfile.lock
index a0a5fca..df0f453 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
     pry-theme (1.1.3)
       coderay (~> 1.1)
       json (~> 1.8)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-cors (0.2.9)