diff --git a/Gemfile b/Gemfile
index 9f336726..62481428 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,5 +8,5 @@ group :ldap do
 end
 
 group :active_resource do
-  gem "activeresource", ">= 2.3.12", "< 4.0"
+  gem "activeresource", "~> 5.1"
 end