diff --git a/packages/contracts-ethers/package.json b/packages/contracts-ethers/package.json
index a62f68fda..d6e5dcdf4 100644
--- a/packages/contracts-ethers/package.json
+++ b/packages/contracts-ethers/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@aragon/osx-ethers",
-  "version": "1.3.0-rc0.2",
+  "version": "1.3.1-rc0",
   "description": "The Aragon OSx contract definitions for ethers.js",
   "main": "dist/bundle-cjs.js",
   "module": "dist/bundle-esm.js",
diff --git a/packages/contracts/CHANGELOG.md b/packages/contracts/CHANGELOG.md
index dc6685d33..dcbf0d0b9 100644
--- a/packages/contracts/CHANGELOG.md
+++ b/packages/contracts/CHANGELOG.md
@@ -5,6 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v1.3.1-rc0
+
+### Added
+
+### Changed
+
+- Added missing `virtual` keyword to `PermissionCondition` and `PermissionConditionUpgradeable`.
+
+### Removed
+
 ## v1.3.0-rc0
 
 ### Added
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index 8c3497b97..8608f9e27 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@aragon/osx-artifacts",
-  "version": "1.3.0-rc0.2",
+  "version": "1.3.1-rc0",
   "description": "The Aragon OSx Solidity contracts",
   "main": "dist/bundle-cjs.js",
   "module": "dist/bundle-esm.js",
diff --git a/packages/contracts/src/core/permission/IPermissionCondition.sol b/packages/contracts/src/core/permission/IPermissionCondition.sol
index 4193f8e60..d0f67910b 100644
--- a/packages/contracts/src/core/permission/IPermissionCondition.sol
+++ b/packages/contracts/src/core/permission/IPermissionCondition.sol
@@ -4,18 +4,19 @@ pragma solidity ^0.8.8;
 
 /// @title IPermissionCondition
 /// @author Aragon Association - 2021-2023
-/// @notice This interface can be implemented to support more customary permissions depending on on- or off-chain state, e.g., by querying token ownershop or a secondary condition, respectively.
+/// @notice An interface to be implemented to support custom permission logic.
+/// @dev To attach a condition to a permission, the `grantWithCondition` function must be used and refer to the implementing contract's address with the `condition` argument.
 interface IPermissionCondition {
-    /// @notice This method is used to check if a call is permitted.
+    /// @notice Checks if a call is permitted.
     /// @param _where The address of the target contract.
     /// @param _who The address (EOA or contract) for which the permissions are checked.
     /// @param _permissionId The permission identifier.
     /// @param _data Optional data passed to the `PermissionCondition` implementation.
-    /// @return allowed Returns true if the call is permitted.
+    /// @return isPermitted Returns true if the call is permitted.
     function isGranted(
         address _where,
         address _who,
         bytes32 _permissionId,
         bytes calldata _data
-    ) external view returns (bool allowed);
+    ) external view returns (bool isPermitted);
 }
diff --git a/packages/contracts/src/core/permission/PermissionCondition.sol b/packages/contracts/src/core/permission/PermissionCondition.sol
index 10ea7e35c..fd9daa463 100644
--- a/packages/contracts/src/core/permission/PermissionCondition.sol
+++ b/packages/contracts/src/core/permission/PermissionCondition.sol
@@ -13,7 +13,7 @@ abstract contract PermissionCondition is ERC165, IPermissionCondition {
     /// @notice Checks if an interface is supported by this or its parent contract.
     /// @param _interfaceId The ID of the interface.
     /// @return Returns `true` if the interface is supported.
-    function supportsInterface(bytes4 _interfaceId) public view override returns (bool) {
+    function supportsInterface(bytes4 _interfaceId) public view virtual override returns (bool) {
         return
             _interfaceId == type(IPermissionCondition).interfaceId ||
             super.supportsInterface(_interfaceId);
diff --git a/packages/contracts/src/core/permission/PermissionConditionUpgdaeable.sol b/packages/contracts/src/core/permission/PermissionConditionUpgradeable.sol
similarity index 96%
rename from packages/contracts/src/core/permission/PermissionConditionUpgdaeable.sol
rename to packages/contracts/src/core/permission/PermissionConditionUpgradeable.sol
index 293beebb2..d9b4142e8 100644
--- a/packages/contracts/src/core/permission/PermissionConditionUpgdaeable.sol
+++ b/packages/contracts/src/core/permission/PermissionConditionUpgradeable.sol
@@ -13,7 +13,7 @@ abstract contract PermissionConditionUpgradeable is ERC165Upgradeable, IPermissi
     /// @notice Checks if an interface is supported by this or its parent contract.
     /// @param _interfaceId The ID of the interface.
     /// @return Returns `true` if the interface is supported.
-    function supportsInterface(bytes4 _interfaceId) public view override returns (bool) {
+    function supportsInterface(bytes4 _interfaceId) public view virtual override returns (bool) {
         return
             _interfaceId == type(IPermissionCondition).interfaceId ||
             super.supportsInterface(_interfaceId);
diff --git a/packages/contracts/src/package.json b/packages/contracts/src/package.json
index 6d8a807af..1093bcce6 100644
--- a/packages/contracts/src/package.json
+++ b/packages/contracts/src/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@aragon/osx",
-  "version": "1.3.0-rc0.2",
+  "version": "1.3.1-rc0",
   "description": "The Aragon OSx Solidity contracts",
   "publishConfig": {
     "access": "public"