diff --git a/near-plugins/src/access_controllable.rs b/near-plugins/src/access_controllable.rs
index c1da319..99ff67c 100644
--- a/near-plugins/src/access_controllable.rs
+++ b/near-plugins/src/access_controllable.rs
@@ -35,8 +35,7 @@
 //! Inspired by OpenZeppelin's
 //! [AccessControl](https://docs.openzeppelin.com/contracts/3.x/api/access#AccessControl) module.
 
-use near_sdk::serde::{Deserialize, Serialize};
-use near_sdk::AccountId;
+use near_sdk::{near, AccountId};
 use std::collections::HashMap;
 
 /// # Representation of roles
@@ -399,7 +398,8 @@ pub trait AccessControllable {
 /// # Uniqueness and ordering
 ///
 /// Account ids returned in vectors are unique but not ordered.
-#[derive(Deserialize, Serialize, Debug)]
+#[near(serializers = [json])]
+#[derive(Debug)]
 pub struct PermissionedAccounts {
     /// The accounts that have super admin permissions.
     pub super_admins: Vec<AccountId>,
@@ -412,7 +412,8 @@ pub struct PermissionedAccounts {
 /// # Uniqueness and ordering
 ///
 /// Account ids returned in vectors are unique but not ordered.
-#[derive(Deserialize, Serialize, Debug)]
+#[near(serializers = [json])]
+#[derive(Debug)]
 pub struct PermissionedAccountsPerRole {
     /// The accounts that have admin permissions for the role.
     pub admins: Vec<AccountId>,
diff --git a/near-plugins/src/upgradable.rs b/near-plugins/src/upgradable.rs
index a32b020..b67fa5e 100644
--- a/near-plugins/src/upgradable.rs
+++ b/near-plugins/src/upgradable.rs
@@ -60,8 +60,7 @@
 //! [batch transaction]: https://docs.near.org/concepts/basics/transactions/overview
 //! [time between scheduling and execution]: https://docs.near.org/sdk/rust/promises/intro
 use crate::events::{AsEvent, EventMetadata};
-use near_sdk::serde::{Deserialize, Serialize};
-use near_sdk::{AccountId, CryptoHash, Gas, NearToken, Promise};
+use near_sdk::{near, serde::Serialize, AccountId, CryptoHash, Gas, NearToken, Promise};
 
 /// Trait describing the functionality of the _Upgradable_ plugin.
 pub trait Upgradable {
@@ -197,7 +196,7 @@ pub trait Upgradable {
     fn up_apply_update_staging_duration(&mut self);
 }
 
-#[derive(Deserialize, Serialize)]
+#[near(serializers = [json])]
 pub struct UpgradableDurationStatus {
     pub staging_duration: Option<near_sdk::Duration>,
     pub staging_timestamp: Option<near_sdk::Timestamp>,
@@ -207,7 +206,8 @@ pub struct UpgradableDurationStatus {
 
 /// Specifies a function call to be appended to the actions of a promise via
 /// [`near_sdk::Promise::function_call`]).
-#[derive(Deserialize, Serialize, Debug)]
+#[near(serializers = [json])]
+#[derive(Debug)]
 pub struct FunctionCallArgs {
     /// The name of the function to call.
     pub function_name: String,