diff --git a/README.md b/README.md
index 883be5a..44f0d9d 100644
--- a/README.md
+++ b/README.md
@@ -57,9 +57,9 @@ Class | Method | Description
 **AccountsApi** | [**create_account**](docs/AccountsApi.md#create_account) | Create an account
   | [**get_account_by_id**](docs/AccountsApi.md#get_account_by_id) | Get an account
   | [**get_accounts**](docs/AccountsApi.md#get_accounts) | Get all accounts
-**BudgetsApi** | [**get_plan_by_id**](docs/BudgetsApi.md#get_plan_by_id) | Get a plan
-  | [**get_plan_settings_by_id**](docs/BudgetsApi.md#get_plan_settings_by_id) | Get plan settings
-  | [**get_plans**](docs/BudgetsApi.md#get_plans) | Get all plans
+**PlansApi** | [**get_plan_by_id**](docs/PlansApi.md#get_plan_by_id) | Get a plan
+  | [**get_plan_settings_by_id**](docs/PlansApi.md#get_plan_settings_by_id) | Get plan settings
+  | [**get_plans**](docs/PlansApi.md#get_plans) | Get all plans
 **CategoriesApi** | [**create_category**](docs/CategoriesApi.md#create_category) | Create a category
   | [**create_category_group**](docs/CategoriesApi.md#create_category_group) | Create a category group
   | [**get_categories**](docs/CategoriesApi.md#get_categories) | Get all categories
diff --git a/ynab/api_client.py b/ynab/api_client.py
index 41c0045..1a3b75a 100644
--- a/ynab/api_client.py
+++ b/ynab/api_client.py
@@ -311,7 +311,7 @@ def response_deserialize(
                 return_data = self.__deserialize_file(response_data)
             elif response_type is not None:
                 match = None
-                content_type = response_data.headers.get('content-type')
+                content_type = response_data.getheader('content-type')
                 if content_type is not None:
                     match = re.search(r"charset=([a-zA-Z\-\d]+)[\s;]?", content_type)
                 encoding = match.group(1) if match else "utf-8"
@@ -328,7 +328,7 @@ def response_deserialize(
         return ApiResponse(
             status_code = response_data.status,
             data = return_data,
-            headers = response_data.headers,
+            headers = response_data.getheaders(),
             raw_data = response_data.data
         )