diff --git a/app/models/user.rb b/app/models/user.rb
index 52b9e103d..b32ab2b27 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,5 +1,5 @@
 class User < ApplicationRecord
   include GDS::SSO::User
 
-  serialize :permissions, coder: JSON, type: Array
+  serialize :permissions, coder: YAML, type: Array
 end