diff --git a/CHANGELOG.md b/CHANGELOG.md
index 074d29e..a5fd9b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+### v3.18.1 (2026-02-19)
+* * * 
+
+### Bug Fixes: 
+- corrected the response schema for [`add_item_entitlement`](https://apidocs.chargebee.com/docs/api/item_entitlements/upsert-or-remove-item-entitlements-for-a-feature).
+- corrected the response schema for [`upsert_or_remove_item_entitlements_for_item`](https://apidocs.chargebee.com/docs/api/item_entitlements/upsert-or-remove-item-entitlements-for-an-item).
+
 ### v3.18.1 (2026-02-16)
 * * * 
 
diff --git a/VERSION b/VERSION
index d21858b..9f6a62d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.18.1
+3.18.2
diff --git a/chargebee/models/item_entitlement/responses.py b/chargebee/models/item_entitlement/responses.py
index f3b52aa..d74e4db 100644
--- a/chargebee/models/item_entitlement/responses.py
+++ b/chargebee/models/item_entitlement/responses.py
@@ -38,13 +38,23 @@ class ItemEntitlementsForFeatureResponse(Response):
     next_offset: str = None
 
 
+@dataclass
+class AddItemEntitlementsItemEntitlementResponse:
+    item_entitlement: ItemEntitlementResponse
+
+
 @dataclass
 class AddItemEntitlementsResponse(Response):
     is_idempotency_replayed: bool
+    list: List[AddItemEntitlementsItemEntitlementResponse]
+
+
+@dataclass
+class UpsertOrRemoveItemEntitlementsForItemItemEntitlementResponse:
     item_entitlement: ItemEntitlementResponse
 
 
 @dataclass
 class UpsertOrRemoveItemEntitlementsForItemResponse(Response):
     is_idempotency_replayed: bool
-    item_entitlement: ItemEntitlementResponse
+    list: List[UpsertOrRemoveItemEntitlementsForItemItemEntitlementResponse]
diff --git a/chargebee/version.py b/chargebee/version.py
index f890bc7..836184b 100644
--- a/chargebee/version.py
+++ b/chargebee/version.py
@@ -1 +1 @@
-VERSION = "3.18.1"
+VERSION = "3.18.2"
diff --git a/tests/test_util.py b/tests/test_util.py
index 9b97781..b1d9aa3 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -46,6 +46,7 @@ def test_serialize(self):
 
     def test_convert_to_serializable_with_enum(self):
         """Test that enums are converted to their values"""
+
         class Status(Enum):
             ACTIVE = "active"
             INACTIVE = "inactive"
@@ -55,6 +56,7 @@ class Status(Enum):
 
     def test_convert_to_serializable_with_dict_containing_enum(self):
         """Test that enums in dicts are converted to their values"""
+
         class Status(Enum):
             ACTIVE = "active"
             INACTIVE = "inactive"
@@ -75,6 +77,7 @@ class Status(Enum):
 
     def test_convert_to_serializable_with_nested_dict(self):
         """Test that nested dicts with enums are handled correctly"""
+
         class Status(Enum):
             ACTIVE = "active"
 
@@ -109,6 +112,7 @@ class Type(Enum):
 
     def test_convert_to_serializable_with_list(self):
         """Test that lists with enums are converted correctly"""
+
         class Status(Enum):
             ACTIVE = "active"
             INACTIVE = "inactive"
@@ -120,6 +124,7 @@ class Status(Enum):
 
     def test_convert_to_serializable_with_tuple(self):
         """Test that tuples with enums are converted correctly and remain tuples"""
+
         class Status(Enum):
             ACTIVE = "active"
             INACTIVE = "inactive"
@@ -132,6 +137,7 @@ class Status(Enum):
 
     def test_convert_to_serializable_with_list_of_dicts(self):
         """Test that lists of dicts with enums are converted correctly"""
+
         class Status(Enum):
             ACTIVE = "active"
             INACTIVE = "inactive"
@@ -150,6 +156,7 @@ class Status(Enum):
 
     def test_convert_to_serializable_with_complex_nested_structure(self):
         """Test complex nested structure with enums at various levels"""
+
         class Status(Enum):
             ACTIVE = "active"
 
@@ -216,6 +223,7 @@ def test_convert_to_serializable_with_empty_structures(self):
 
     def test_convert_to_serializable_with_integer_enum(self):
         """Test that enums with integer values are converted correctly"""
+
         class Priority(Enum):
             LOW = 1
             MEDIUM = 2