diff --git a/Gemfile.lock b/Gemfile.lock
index 033fbf4..5c5d91f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,7 +71,7 @@ GEM
       rack (~> 1.2)
     puma (1.6.3-java)
       rack (~> 1.2)
-    rack (1.4.4)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)