diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee29df7a..fc9b4801 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@ All notable changes to the Zowe Client Python SDK will be documented in this fil
 
 - Added checks and auto addition for license headers on workflow. [#293] (https://github.com/zowe/zowe-client-python-sdk/issues/293)
 
+- *Breaking*: Update custom class for REST API responses [#89] (https://github.com/zowe/zowe-client-python-sdk/issues/89)
+
 ### Bug Fixes
 
 ## `1.0.0-dev18`
diff --git a/src/zos_files/zowe/zos_files_for_zowe_sdk/response/datasets.py b/src/zos_files/zowe/zos_files_for_zowe_sdk/response/datasets.py
index 0c5f7ada..76fe92d3 100644
--- a/src/zos_files/zowe/zos_files_for_zowe_sdk/response/datasets.py
+++ b/src/zos_files/zowe/zos_files_for_zowe_sdk/response/datasets.py
@@ -9,13 +9,14 @@
 
 Copyright Contributors to the Zowe Project.
 """
+
 from dataclasses import dataclass
 from typing import Any, Dict, List, Optional
 
 
 @dataclass
 class DatasetListResponse:
-    items: Optional[list[dict]] = None
+    items: Optional[List[dict]] = None
     returnedRows: Optional[int] = None
     totalRows: Optional[int] = None
     JSONversion: Optional[int] = None
@@ -78,7 +79,7 @@ def __setitem__(self, key: str, value: Any) -> None:
 
 @dataclass
 class MemberListResponse:
-    items: Optional[list[dict]] = None
+    items: Optional[List[dict]] = None
     totalRows: Optional[int] = None
     JSONversion: Optional[int] = None
 
diff --git a/src/zos_files/zowe/zos_files_for_zowe_sdk/response/file_system.py b/src/zos_files/zowe/zos_files_for_zowe_sdk/response/file_system.py
index c48c6cde..30e41750 100644
--- a/src/zos_files/zowe/zos_files_for_zowe_sdk/response/file_system.py
+++ b/src/zos_files/zowe/zos_files_for_zowe_sdk/response/file_system.py
@@ -9,6 +9,7 @@
 
 Copyright Contributors to the Zowe Project.
 """
+
 from dataclasses import dataclass
 from typing import Any, Dict, List, Optional
 
@@ -40,7 +41,7 @@ def __setitem__(self, key: str, value: Any) -> None:
 
 @dataclass
 class FileSystemListResponse:
-    items: Optional[list[FileSystemResponse]] = None
+    items: Optional[List[FileSystemResponse]] = None
     returnedRows: Optional[int] = None
     totalRows: Optional[int] = None
     JSONversion: Optional[int] = None
diff --git a/src/zos_files/zowe/zos_files_for_zowe_sdk/response/uss.py b/src/zos_files/zowe/zos_files_for_zowe_sdk/response/uss.py
index d9414e7b..644abebe 100644
--- a/src/zos_files/zowe/zos_files_for_zowe_sdk/response/uss.py
+++ b/src/zos_files/zowe/zos_files_for_zowe_sdk/response/uss.py
@@ -9,6 +9,7 @@
 
 Copyright Contributors to the Zowe Project.
 """
+
 from dataclasses import dataclass
 from typing import Any, Optional
 
@@ -33,7 +34,7 @@ def __setitem__(self, key: str, value: Any) -> None:
 
 @dataclass
 class USSListResponse:
-    items: Optional[list[dict]] = None
+    items: Optional[List[dict]] = None
     returnedRows: Optional[int] = None
     totalRows: Optional[int] = None
     JSONversion: Optional[int] = None
diff --git a/src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py b/src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py
index ad1948f0..5de2d488 100644
--- a/src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py
+++ b/src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py
@@ -11,7 +11,7 @@
 """
 
 import os
-from typing import Optional
+from typing import List, Optional
 
 from zowe.core_for_zowe_sdk import SdkApi
 
@@ -265,7 +265,7 @@ def list_jobs(
         prefix: str = "*",
         max_jobs: int = 1000,
         user_correlator: Optional[str] = None,
-    ) -> list[JobResponse]:
+    ) -> List[JobResponse]:
         """
         Retrieve list of jobs on JES based on the provided arguments.
 
@@ -369,7 +369,7 @@ def submit_plaintext(self, jcl: str) -> JobResponse:
         response_json = self.request_handler.perform_request("PUT", custom_args, expected_code=[201])
         return JobResponse(response_json)
 
-    def get_spool_files(self, correlator: str) -> list[SpoolResponse]:
+    def get_spool_files(self, correlator: str) -> List[SpoolResponse]:
         """
         Retrieve the spool files for a job identified by the correlator.
 
diff --git a/src/zos_tso/zowe/zos_tso_for_zowe_sdk/response/tso.py b/src/zos_tso/zowe/zos_tso_for_zowe_sdk/response/tso.py
index 82a007fa..1e779700 100644
--- a/src/zos_tso/zowe/zos_tso_for_zowe_sdk/response/tso.py
+++ b/src/zos_tso/zowe/zos_tso_for_zowe_sdk/response/tso.py
@@ -9,6 +9,7 @@
 
 Copyright Contributors to the Zowe Project.
 """
+
 from dataclasses import dataclass
 from typing import Any, Dict, List, Optional
 
@@ -19,7 +20,7 @@ class StartResponse:
     queueID: Optional[str] = None
     sessionID: Optional[str] = None
     ver: Optional[str] = None
-    tsoData: Optional[list[dict]] = None
+    tsoData: Optional[List[dict]] = None
     reused: Optional[bool] = None
     timeout: Optional[bool] = None
 
@@ -37,7 +38,7 @@ class EndResponse:
     reused: Optional[bool] = None
     timeout: Optional[bool] = None
     msgData: Optional[str] = None
-    msgId: Optional[list] = None
+    msgId: Optional[List] = None
 
     def __getitem__(self, key: str) -> Any:
         return self.__dict__[key]
@@ -50,7 +51,7 @@ def __setitem__(self, key: str, value: Any) -> None:
 class SendResponse:
     servletKey: Optional[str] = None
     ver: Optional[str] = None
-    tsoData: Optional[list[dict]] = None
+    tsoData: Optional[List[dict]] = None
     reused: Optional[bool] = None
     timeout: Optional[bool] = None