diff --git a/.codegen.json b/.codegen.json
index 20a478fc..09da4c40 100644
--- a/.codegen.json
+++ b/.codegen.json
@@ -1 +1 @@
-{ "engineHash": "0072e8b", "specHash": "88cd5aa", "version": "10.15.0" }
+{ "engineHash": "daeb1ea", "specHash": "88cd5aa", "version": "10.15.0" }
diff --git a/box_sdk_gen/networking/box_network_client.py b/box_sdk_gen/networking/box_network_client.py
index 5bd7d595..ee97c9b4 100644
--- a/box_sdk_gen/networking/box_network_client.py
+++ b/box_sdk_gen/networking/box_network_client.py
@@ -8,6 +8,7 @@
 
 import requests
 from requests import RequestException, Session, Response
+from requests.structures import CaseInsensitiveDict
 from requests_toolbelt import MultipartEncoder
 
 from ..internal.logging import DataSanitizer
@@ -92,12 +93,13 @@ def fetch(self, options: 'FetchOptions') -> FetchResponse:
             if response.network_response is not None:
                 attempt_for_retry = attempt_nr
                 network_response = response.network_response
+                response_headers = CaseInsensitiveDict(network_response.headers)
 
                 if options.response_format == 'binary':
                     fetch_response = FetchResponse(
                         url=network_response.url,
                         status=network_response.status_code,
-                        headers=dict(response.network_response.headers),
+                        headers=response_headers,
                         content=ResponseByteStream(
                             response.network_response.iter_content(chunk_size=1024)
                         ),
@@ -106,7 +108,7 @@ def fetch(self, options: 'FetchOptions') -> FetchResponse:
                     fetch_response = FetchResponse(
                         url=network_response.url,
                         status=network_response.status_code,
-                        headers=dict(response.network_response.headers),
+                        headers=response_headers,
                         data=(self._read_json_body(network_response.text)),
                         content=io.BytesIO(network_response.content),
                     )
diff --git a/test/box_network_client.py b/test/box_network_client.py
index 5b295566..f6bc2828 100644
--- a/test/box_network_client.py
+++ b/test/box_network_client.py
@@ -30,6 +30,13 @@
 )
 from box_sdk_gen.networking.proxy_config import ProxyConfig
 
+RETRY_AFTER_HEADER_CASES = [
+    "retry-after",
+    "Retry-After",
+    "rEtRy-AfTeR",
+    "RETRY-AFTER",
+]
+
 
 @pytest.fixture
 def mock_requests_session():
@@ -609,13 +616,16 @@ def test_status_code_202_with_no_retry_after_header(
     assert fetch_response.data == {}
 
 
-def test_retryable_status_code_202(
+@pytest.mark.parametrize("retry_after_header", RETRY_AFTER_HEADER_CASES)
+def test_retryable_status_code_202_with_case_insensitive_retry_after_header(
     network_client,
     mock_requests_session,
     network_session_mock,
     response_202_with_retry_after,
     response_200,
+    retry_after_header,
 ):
+    response_202_with_retry_after.headers = {retry_after_header: "0"}
     response_200.text = '{"id": "123456"}'
     response_200.headers = {"Retry-After": "0"}
     mock_requests_session.request.side_effect = [
@@ -847,14 +857,16 @@ def test_get_retry_after_time_use_exponential_backoff(network_session_mock):
         assert sleep_time > 0
 
 
-def test_pass_retry_after_header_to_get_retry_after_time_method(
+@pytest.mark.parametrize("retry_after_header", RETRY_AFTER_HEADER_CASES)
+def test_pass_case_insensitive_retry_after_header_to_get_retry_after_time_method(
     network_client,
     mock_requests_session,
     network_session_mock,
     response_429,
     response_200,
+    retry_after_header,
 ):
-    response_429.headers = {"Retry-After": "123"}
+    response_429.headers = {retry_after_header: "123"}
     mock_requests_session.request.side_effect = [response_429, response_200]
 
     with patch("time.sleep") as sleep_mock: