diff --git a/Gemfile b/Gemfile
index eaaf55a..ea3a893 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,4 +3,4 @@ source :rubygems
 gem "sinatra"
 gem "haml"
 gem "httparty"
-gem "actionpack"
+gem "actionpack", ">= 5.2.7.1"