diff --git a/app/models/saml_app_config.rb b/app/models/saml_app_config.rb
index 1fa8c35c..9365d844 100644
--- a/app/models/saml_app_config.rb
+++ b/app/models/saml_app_config.rb
@@ -2,6 +2,8 @@ class SamlAppConfig < ApplicationRecord
   belongs_to :group
   belongs_to :organisation
 
+  serialize :config, JSON
+
   def self.get_config(app_name, org_id)
     SamlAppConfig.find_or_initialize_by(
       app_name: app_name, organisation_id: org_id
diff --git a/db/schema.rb b/db/schema.rb
index 754f724a..bf7e20a2 100755
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -124,11 +124,11 @@
   create_table "saml_app_configs", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
     t.integer  "group_id"
     t.string   "sso_url"
-    t.json     "config"
+    t.text     "config",          limit: 4294967295,              collation: "utf8mb4_bin"
     t.integer  "organisation_id"
     t.string   "app_name"
-    t.datetime "created_at",      null: false
-    t.datetime "updated_at",      null: false
+    t.datetime "created_at",                         null: false
+    t.datetime "updated_at",                         null: false
     t.index ["group_id"], name: "index_saml_app_configs_on_group_id", using: :btree
     t.index ["organisation_id"], name: "index_saml_app_configs_on_organisation_id", using: :btree
   end