diff --git a/Gemfile.lock b/Gemfile.lock
index 7dd9186..60f32d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -178,7 +178,7 @@ GEM
       method_source (~> 0.9.0)
     puma (4.0.1)
       nio4r (~> 2.0)
-    rack (1.6.11)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.11.1)