admin can change protocol fee address

src/PartyPool.sol

@@ -67,8 +67,7 @@ contract PartyPool is PartyPoolBase, OwnableExternal, ERC20External, IPartyPool
     function protocolFeePpm() external view returns (uint256) { return PROTOCOL_FEE_PPM; }
 
     /// @notice Address to which collected protocol _tokens will be sent on collectProtocolFees()
-    address private immutable PROTOCOL_FEE_ADDRESS;
-    function protocolFeeAddress() external view returns (address) { return PROTOCOL_FEE_ADDRESS; }
+    address public protocolFeeAddress;
 
     // @inheritdoc IPartyPool
     function allProtocolFeesOwed() external view returns (uint256[] memory) { return _protocolFeesOwed; }
@@ -139,7 +138,7 @@ contract PartyPool is PartyPoolBase, OwnableExternal, ERC20External, IPartyPool
         // If the protocolFeePpm_ is set, then also require the fee address to be nonzero
         require(protocolFeePpm_ == 0 || protocolFeeAddress_ != address(0));
         PROTOCOL_FEE_PPM = protocolFeePpm_;
-        PROTOCOL_FEE_ADDRESS = protocolFeeAddress_;
+        protocolFeeAddress = protocolFeeAddress_;
         SWAP_IMPL = swapImpl_;
         MINT_IMPL = mintImpl_;
 
@@ -159,6 +158,14 @@ contract PartyPool is PartyPoolBase, OwnableExternal, ERC20External, IPartyPool
         _protocolFeesOwed = new uint256[](n);
     }
 
+    //
+    // Admin operations
+    //
+
+    function setProtocolFeeAddress( address feeAddress ) external onlyOwner {
+        protocolFeeAddress = feeAddress;
+    }
+
     /// @notice If a security problem is found, the vault owner may call this function to permanently disable swap and
     /// mint functionality, leaving only burns (withdrawals) working.
     function kill() external onlyOwner {
@@ -482,7 +489,7 @@ contract PartyPool is PartyPoolBase, OwnableExternal, ERC20External, IPartyPool
     function collectProtocolFees() external nonReentrant {
         bytes memory data = abi.encodeWithSelector(
             PartyPoolSwapImpl.collectProtocolFees.selector,
-            PROTOCOL_FEE_ADDRESS
+            protocolFeeAddress
         );
         Address.functionDelegateCall(address(MINT_IMPL), data);
     }