diff --git a/CHANGELOG.md b/CHANGELOG.md
index a38649c5a..3b8d74ccc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# v10.0.1
+**Bug Fix:**
+- Fix content type regression in custom object patch API [kubernetes-client/python#866](https://github.com/kubernetes-client/python/issues/866)
+
 # v10.0.0
 **Bug Fix:**
 - Fix base64 padding for kube config [kubernetes-client/python-base#79](https://github.com/kubernetes-client/python-base/pull/79)
diff --git a/kubernetes/client/apis/custom_objects_api.py b/kubernetes/client/apis/custom_objects_api.py
index 90236a362..12848a915 100644
--- a/kubernetes/client/apis/custom_objects_api.py
+++ b/kubernetes/client/apis/custom_objects_api.py
@@ -1657,7 +1657,7 @@ class CustomObjectsApi(object):
 
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.\
-            select_header_content_type(['application/json-patch+json', 'application/merge-patch+json'])
+            select_header_content_type(['application/merge-patch+json', 'application/json-patch+json'])
 
         # Authentication setting
         auth_settings = ['BearerToken']
@@ -1781,7 +1781,7 @@ class CustomObjectsApi(object):
 
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.\
-            select_header_content_type(['application/json-patch+json', 'application/merge-patch+json'])
+            select_header_content_type(['application/merge-patch+json', 'application/json-patch+json'])
 
         # Authentication setting
         auth_settings = ['BearerToken']
@@ -1905,7 +1905,7 @@ class CustomObjectsApi(object):
 
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.\
-            select_header_content_type(['application/json-patch+json', 'application/merge-patch+json'])
+            select_header_content_type(['application/merge-patch+json', 'application/json-patch+json'])
 
         # Authentication setting
         auth_settings = ['BearerToken']
@@ -2036,7 +2036,7 @@ class CustomObjectsApi(object):
 
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.\
-            select_header_content_type(['application/json-patch+json', 'application/merge-patch+json'])
+            select_header_content_type(['application/merge-patch+json', 'application/json-patch+json'])
 
         # Authentication setting
         auth_settings = ['BearerToken']
@@ -2167,7 +2167,7 @@ class CustomObjectsApi(object):
 
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.\
-            select_header_content_type(['application/json-patch+json', 'application/merge-patch+json'])
+            select_header_content_type(['application/merge-patch+json', 'application/json-patch+json'])
 
         # Authentication setting
         auth_settings = ['BearerToken']
@@ -2298,7 +2298,7 @@ class CustomObjectsApi(object):
 
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.\
-            select_header_content_type(['application/json-patch+json', 'application/merge-patch+json'])
+            select_header_content_type(['application/merge-patch+json', 'application/json-patch+json'])
 
         # Authentication setting
         auth_settings = ['BearerToken']