diff --git a/db-migration/Gemfile.lock b/db-migration/Gemfile.lock
index 86257be..8345896 100644
--- a/db-migration/Gemfile.lock
+++ b/db-migration/Gemfile.lock
@@ -38,7 +38,7 @@ GEM
     nokogiri (1.8.0)
       mini_portile2 (~> 2.2.0)
     pg (0.21.0)
-    rack (1.6.8)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)