diff --git a/README.md b/README.md
index 11a2e088..b52f0185 100644
--- a/README.md
+++ b/README.md
@@ -1,22 +1,23 @@
+![](https://github.com/dl-solarity/solidity-lib/assets/47551140/f5c3929c-657e-4a27-84a2-e5f1bf14e4e9)
+
 [![npm](https://img.shields.io/npm/v/@solarity/solidity-lib.svg)](https://www.npmjs.com/package/@solarity/solidity-lib)
 [![Coverage Status](https://codecov.io/gh/dl-solarity/solidity-lib/graph/badge.svg)](https://codecov.io/gh/dl-solarity/solidity-lib)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![GitPOAP Badge](https://public-api.gitpoap.io/v1/repo/dl-solarity/solidity-lib/badge)](https://www.gitpoap.io/gh/dl-solarity/solidity-lib)
 
-# Solidity Library by Distributed Lab
-
-**Solidity Library for savvies by DL**
+# Solidity Library for savvies by Distributed Lab
 
-The library consists of modules and utilities that are built with a help of [Openzeppelin Contracts](https://github.com/OpenZeppelin/openzeppelin-contracts) (4.9.2) and go far beyond mediocre solidity.
+The library consists of modules and utilities that are built with a help of [Openzeppelin Contracts](https://github.com/OpenZeppelin/openzeppelin-contracts) (4.9.2) and **go far beyond mediocre solidity**.
 
 - Implementation of [**Contracts Registry**](https://eips.ethereum.org/EIPS/eip-6224) pattern
-- Versatile **RBAC** smart contract
+- Versatile **RBAC** and **MultiOwnable** smart contracts
 - Enhanced and simplified [**Diamond**](https://eips.ethereum.org/EIPS/eip-2535) pattern
 - Heap based priority queue library
 - Memory data structures (Vector)
 - Optimized [**Incremental Merkle Tree**](https://github.com/runtimeverification/deposit-contract-verification/blob/master/deposit-contract-verification.pdf) data structure
 - Novel **ReturnDataProxy** contract
-- Utilities to ease work with ERC20 decimals, arrays, and sets
+- Lightweight **SBT** implementation
+- Utilities to ease work with ERC20 decimals, arrays, sets and ZK proofs
 
 ## Overview
 
diff --git a/contracts/access-control/MultiOwnable.sol b/contracts/access-control/MultiOwnable.sol
index a7fdbe61..a2edc49a 100644
--- a/contracts/access-control/MultiOwnable.sol
+++ b/contracts/access-control/MultiOwnable.sol
@@ -39,23 +39,23 @@ abstract contract MultiOwnable is IMultiOwnable, Initializable {
         _addOwners(msg.sender.asSingletonArray());
     }
 
-    function addOwners(address[] memory newOwners_) public virtual override onlyOwner {
+    function addOwners(address[] memory newOwners_) public override onlyOwner {
         _addOwners(newOwners_);
     }
 
-    function removeOwners(address[] memory oldOwners_) public virtual override onlyOwner {
+    function removeOwners(address[] memory oldOwners_) public override onlyOwner {
         _removeOwners(oldOwners_);
     }
 
-    function renounceOwnership() public virtual override onlyOwner {
+    function renounceOwnership() public override onlyOwner {
         _removeOwners(msg.sender.asSingletonArray());
     }
 
-    function getOwners() public view virtual override returns (address[] memory) {
+    function getOwners() public view override returns (address[] memory) {
         return _owners.values();
     }
 
-    function isOwner(address address_) public view virtual override returns (bool) {
+    function isOwner(address address_) public view override returns (bool) {
         return _owners.contains(address_);
     }
 
diff --git a/contracts/compound-rate-keeper/AbstractCompoundRateKeeper.sol b/contracts/compound-rate-keeper/AbstractCompoundRateKeeper.sol
index 1fd06144..16332624 100644
--- a/contracts/compound-rate-keeper/AbstractCompoundRateKeeper.sol
+++ b/contracts/compound-rate-keeper/AbstractCompoundRateKeeper.sol
@@ -157,7 +157,7 @@ abstract contract AbstractCompoundRateKeeper is ICompoundRateKeeper, Initializab
      * @notice The internal function to set the capitalization rate
      * @param capitalizationRate_ new capitalization rate
      */
-    function _setCapitalizationRate(uint256 capitalizationRate_) internal {
+    function _setCapitalizationRate(uint256 capitalizationRate_) internal virtual {
         _update();
         _changeCapitalizationRate(capitalizationRate_);
     }
@@ -166,7 +166,7 @@ abstract contract AbstractCompoundRateKeeper is ICompoundRateKeeper, Initializab
      * @notice The internal function to set the capitalization period
      * @param capitalizationPeriod_ new capitalization period
      */
-    function _setCapitalizationPeriod(uint64 capitalizationPeriod_) internal {
+    function _setCapitalizationPeriod(uint64 capitalizationPeriod_) internal virtual {
         _update();
         _changeCapitalizationPeriod(capitalizationPeriod_);
     }
diff --git a/contracts/contracts-registry/AbstractContractsRegistry.sol b/contracts/contracts-registry/AbstractContractsRegistry.sol
index dd874e78..e9addb9d 100644
--- a/contracts/contracts-registry/AbstractContractsRegistry.sol
+++ b/contracts/contracts-registry/AbstractContractsRegistry.sol
@@ -101,7 +101,7 @@ abstract contract AbstractContractsRegistry is Initializable {
      * @notice The function that injects the dependencies into the given contract
      * @param name_ the name of the contract
      */
-    function _injectDependencies(string memory name_) internal {
+    function _injectDependencies(string memory name_) internal virtual {
         _injectDependenciesWithData(name_, bytes(""));
     }
 
@@ -110,7 +110,10 @@ abstract contract AbstractContractsRegistry is Initializable {
      * @param name_ the name of the contract
      * @param data_ the extra context data
      */
-    function _injectDependenciesWithData(string memory name_, bytes memory data_) internal {
+    function _injectDependenciesWithData(
+        string memory name_,
+        bytes memory data_
+    ) internal virtual {
         address contractAddress_ = _contracts[name_];
 
         require(contractAddress_ != address(0), "ContractsRegistry: this mapping doesn't exist");
@@ -126,7 +129,7 @@ abstract contract AbstractContractsRegistry is Initializable {
      *
      * It is the Owner's responsibility to ensure the compatibility between implementations
      */
-    function _upgradeContract(string memory name_, address newImplementation_) internal {
+    function _upgradeContract(string memory name_, address newImplementation_) internal virtual {
         _upgradeContractAndCall(name_, newImplementation_, bytes(""));
     }
 
@@ -142,7 +145,7 @@ abstract contract AbstractContractsRegistry is Initializable {
         string memory name_,
         address newImplementation_,
         bytes memory data_
-    ) internal {
+    ) internal virtual {
         address contractToUpgrade_ = _contracts[name_];
 
         require(contractToUpgrade_ != address(0), "ContractsRegistry: this mapping doesn't exist");
@@ -159,7 +162,7 @@ abstract contract AbstractContractsRegistry is Initializable {
      * @param name_ the name to associate the contract with
      * @param contractAddress_ the address of the contract
      */
-    function _addContract(string memory name_, address contractAddress_) internal {
+    function _addContract(string memory name_, address contractAddress_) internal virtual {
         require(contractAddress_ != address(0), "ContractsRegistry: zero address is forbidden");
 
         _contracts[name_] = contractAddress_;
@@ -173,7 +176,7 @@ abstract contract AbstractContractsRegistry is Initializable {
      * @param name_ the name to associate the contract with
      * @param contractAddress_ the address of the implementation
      */
-    function _addProxyContract(string memory name_, address contractAddress_) internal {
+    function _addProxyContract(string memory name_, address contractAddress_) internal virtual {
         _addProxyContractAndCall(name_, contractAddress_, bytes(""));
     }
 
@@ -188,7 +191,7 @@ abstract contract AbstractContractsRegistry is Initializable {
         string memory name_,
         address contractAddress_,
         bytes memory data_
-    ) internal {
+    ) internal virtual {
         require(contractAddress_ != address(0), "ContractsRegistry: zero address is forbidden");
 
         address proxyAddr_ = address(
@@ -208,7 +211,10 @@ abstract contract AbstractContractsRegistry is Initializable {
      * @param name_ the name to associate the contract with
      * @param contractAddress_ the address of the proxy
      */
-    function _justAddProxyContract(string memory name_, address contractAddress_) internal {
+    function _justAddProxyContract(
+        string memory name_,
+        address contractAddress_
+    ) internal virtual {
         require(contractAddress_ != address(0), "ContractsRegistry: zero address is forbidden");
 
         _contracts[name_] = contractAddress_;
@@ -225,7 +231,7 @@ abstract contract AbstractContractsRegistry is Initializable {
      * @notice The function to remove the contract from the ContractsRegistry
      * @param name_ the associated name with the contract
      */
-    function _removeContract(string memory name_) internal {
+    function _removeContract(string memory name_) internal virtual {
         address contractAddress_ = _contracts[name_];
 
         require(contractAddress_ != address(0), "ContractsRegistry: this mapping doesn't exist");
diff --git a/contracts/contracts-registry/pools/AbstractPoolContractsRegistry.sol b/contracts/contracts-registry/pools/AbstractPoolContractsRegistry.sol
index d6e18dd2..85e71bf0 100644
--- a/contracts/contracts-registry/pools/AbstractPoolContractsRegistry.sol
+++ b/contracts/contracts-registry/pools/AbstractPoolContractsRegistry.sol
@@ -121,7 +121,7 @@ abstract contract AbstractPoolContractsRegistry is Initializable, AbstractDepend
     function _setNewImplementations(
         string[] memory names_,
         address[] memory newImplementations_
-    ) internal {
+    ) internal virtual {
         for (uint256 i = 0; i < names_.length; i++) {
             if (address(_beacons[names_[i]]) == address(0)) {
                 _beacons[names_[i]] = new ProxyBeacon();
@@ -143,7 +143,7 @@ abstract contract AbstractPoolContractsRegistry is Initializable, AbstractDepend
         string memory name_,
         uint256 offset_,
         uint256 limit_
-    ) internal {
+    ) internal virtual {
         _injectDependenciesToExistingPoolsWithData(name_, bytes(""), offset_, limit_);
     }
 
@@ -159,7 +159,7 @@ abstract contract AbstractPoolContractsRegistry is Initializable, AbstractDepend
         bytes memory data_,
         uint256 offset_,
         uint256 limit_
-    ) internal {
+    ) internal virtual {
         EnumerableSet.AddressSet storage _namedPools = _pools[name_];
 
         uint256 to_ = (offset_ + limit_).min(_namedPools.length()).max(offset_);
@@ -178,7 +178,7 @@ abstract contract AbstractPoolContractsRegistry is Initializable, AbstractDepend
      * @param name_ the pool's associated name
      * @param poolAddress_ the proxy address of the pool
      */
-    function _addProxyPool(string memory name_, address poolAddress_) internal {
+    function _addProxyPool(string memory name_, address poolAddress_) internal virtual {
         _pools[name_].add(poolAddress_);
     }
 }
diff --git a/contracts/contracts-registry/pools/pool-factory/AbstractPoolFactory.sol b/contracts/contracts-registry/pools/pool-factory/AbstractPoolFactory.sol
index 8b2eb300..70e123f0 100644
--- a/contracts/contracts-registry/pools/pool-factory/AbstractPoolFactory.sol
+++ b/contracts/contracts-registry/pools/pool-factory/AbstractPoolFactory.sol
@@ -73,7 +73,7 @@ abstract contract AbstractPoolFactory is AbstractDependant {
         address poolRegistry_,
         string memory poolType_,
         address poolProxy_
-    ) internal {
+    ) internal virtual {
         (bool success, ) = poolRegistry_.call(
             abi.encodeWithSignature("addProxyPool(string,address)", poolType_, poolProxy_)
         );
diff --git a/contracts/package.json b/contracts/package.json
index 61c3771d..ca499951 100644
--- a/contracts/package.json
+++ b/contracts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@solarity/solidity-lib",
-  "version": "2.5.8",
+  "version": "2.5.9",
   "license": "MIT",
   "author": "Distributed Lab",
   "readme": "README.md",
diff --git a/package.json b/package.json
index 6f8126a3..24a26f89 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@solarity/solidity-lib",
-  "version": "2.5.8",
+  "version": "2.5.9",
   "license": "MIT",
   "author": "Distributed Lab",
   "description": "Solidity Library by Distributed Lab",