diff --git a/contracts/instance/IInstanceService.sol b/contracts/instance/IInstanceService.sol
index be038cfc5..2717d7d91 100644
--- a/contracts/instance/IInstanceService.sol
+++ b/contracts/instance/IInstanceService.sol
@@ -56,6 +56,8 @@ interface IInstanceService is IService {
     
     event LogInstanceServiceInstanceLocked(NftId instanceNftId, bool locked);
     event LogInstanceServiceInstanceCreated(NftId instanceNftId, address instance);
+    event LogInstanceServiceMasterInstanceReaderUpgraded(NftId instanceNfId, address newInstanceReader);
+    event LogInstanceServiceInstanceReaderUpgraded(NftId instanceNfId, address newInstanceReader);
 
     /// @dev Creates a new custom role for the calling instance.
     function createRole(string memory roleName, RoleId adminRoleId, uint32 maxMemberCount) external returns (RoleId roleId);
diff --git a/contracts/instance/InstanceService.sol b/contracts/instance/InstanceService.sol
index 5e74b9150..9f2f1f987 100644
--- a/contracts/instance/InstanceService.sol
+++ b/contracts/instance/InstanceService.sol
@@ -303,6 +303,10 @@ contract InstanceService is
 
         upgradedInstanceReaderClone.initializeWithInstance(instanceAddress);
         instance.setInstanceReader(upgradedInstanceReaderClone);
+
+        emit LogInstanceServiceInstanceReaderUpgraded(
+            getRegistry().getNftIdForAddress(instanceAddress),
+            address(upgradedInstanceReaderClone));
     }
 
 
@@ -373,6 +377,10 @@ contract InstanceService is
         if(instanceReader.getInstance() != IInstance(_masterInstance)) { revert ErrorInstanceServiceInstanceReaderInstanceMismatch(); }
 
         _masterInstanceReader = instanceReaderAddress;
+
+        emit LogInstanceServiceMasterInstanceReaderUpgraded(
+            getRegistry().getNftIdForAddress(_masterInstance),
+            instanceReaderAddress);
     }
 
     function getMasterInstanceReader() external virtual view returns (address) {
diff --git a/test/instance/InstanceReader.t.sol b/test/instance/InstanceReader.t.sol
index 91658007e..a51519cb8 100644
--- a/test/instance/InstanceReader.t.sol
+++ b/test/instance/InstanceReader.t.sol
@@ -22,7 +22,11 @@ contract InstanceReaderTest is GifTest {
         // GIVEN
         vm.startPrank(registryOwner);
         InstanceReader newMasterInstanceReader = _createNewMasterInstanceReader();
+        // address newMasterInstanceReaderAddress = address(newMasterInstanceReader);
         
+        vm.expectEmit();
+        emit IInstanceService.LogInstanceServiceMasterInstanceReaderUpgraded(masterInstanceNftId, address(newMasterInstanceReader));
+
         // WHEN
         instanceService.upgradeMasterInstanceReader(address(newMasterInstanceReader));
 
@@ -72,6 +76,10 @@ contract InstanceReaderTest is GifTest {
 
         // WHEN
         vm.startPrank(instanceOwner);
+
+        vm.expectEmit(true, false, false, false);
+        emit IInstanceService.LogInstanceServiceInstanceReaderUpgraded(instanceNftId, address(newMasterInstanceReader));
+
         instance.upgradeInstanceReader();
         vm.stopPrank();