diff --git a/Gemfile b/Gemfile
index 05ec3ad..2a8eeb4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rack', '~> 1.6.11'
+gem 'rack', '~> 1.6.12'
 gem 'rack-cors'
 gem 'grape', '~> 1.1.0'
 gem 'grape-entity', '~> 0.5.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index cd7e6e5..08a4fdb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -58,7 +58,7 @@ GEM
     otr-activerecord (1.2.1)
       activerecord (>= 4.0, < 5.1)
       hashie-forbidden_attributes (~> 0.1)
-    rack (1.6.11)
+    rack (1.6.12)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-cors (1.0.5)
@@ -95,7 +95,7 @@ DEPENDENCIES
   grape-entity (~> 0.5.1)
   mysql2
   otr-activerecord (~> 1.2.1)
-  rack (~> 1.6.11)
+  rack (~> 1.6.12)
   rack-cors
   rack-test
   rake