diff --git a/src/ERC173/ERC173.sol b/src/ERC173/ERC173.sol
index 7a998401..b0d67d85 100644
--- a/src/ERC173/ERC173.sol
+++ b/src/ERC173/ERC173.sol
@@ -43,4 +43,17 @@ contract ERC173Facet {
 
         emit OwnershipTransferred(previousOwner, _newOwner);
     }
+
+    /// @notice Renounce ownership of the contract
+    /// @dev Sets the owner to address(0), disabling all functions restricted to the owner.
+    function renounceOwnership() external {
+        ERC173Storage storage s = getStorage();
+        if (msg.sender != s.owner) revert OwnableUnauthorizedAccount();
+
+        address previousOwner = s.owner;
+        s.owner = address(0);
+
+        emit OwnershipTransferred(previousOwner, address(0));
+    }
+
 }
diff --git a/src/ERC173/libraries/LibERC173.sol b/src/ERC173/libraries/LibERC173.sol
index 1587a51b..714cb712 100644
--- a/src/ERC173/libraries/LibERC173.sol
+++ b/src/ERC173/libraries/LibERC173.sol
@@ -43,4 +43,16 @@ library LibERC173 {
 
         emit OwnershipTransferred(previousOwner, _newOwner);
     }
+
+    /// @notice Renounce ownership of the contract
+    /// @dev Sets the owner to address(0), disabling all functions restricted to the owner
+    function renounceOwnership() internal {
+        ERC173Storage storage s = getStorage();
+        if (s.owner == address(0)) revert OwnableAlreadyRenounced();
+
+        address previousOwner = s.owner;
+        s.owner = address(0);
+
+        emit OwnershipTransferred(previousOwner, address(0));
+    }
 }
diff --git a/src/ERC721/ERC721/ERC721Facet.sol b/src/ERC721/ERC721/ERC721Facet.sol
index 8ae9f1d5..55f2049e 100644
--- a/src/ERC721/ERC721/ERC721Facet.sol
+++ b/src/ERC721/ERC721/ERC721Facet.sol
@@ -261,7 +261,7 @@ contract ERC721Facet {
     /// From openzeppelin/contracts/utils/Strings.sol
     /// @dev Converts a `uint256` to its ASCII `string` decimal representation.
     function toString(uint256 value) internal pure returns (string memory) {
-        bytes16 _SYMBOLS = "0123456789abcdef";
+        bytes16 _SYMBOLS = "0123456789";
         unchecked {
             uint256 length = log10(value) + 1;
             string memory buffer = new string(length);