diff --git a/README.md b/README.md
index 0878ad3..77a405a 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ print(decrypted_token.uid2)
 
    >IMPORTANT: Be sure to call this function only when you have obtained legal basis to convert the user’s [directly identifying information (DII)](https://unifiedid.com/docs/ref-info/glossary-uid#gl-dii) to UID2 tokens for targeted advertising.
    
-   >`do_not_generate_tokens_for_opted_out()` applies `policy=1` in the [/token/generate](https://unifiedid.com/docs/endpoints/post-token-generate#token-generation-policy) call. Without this, `policy` is omitted to maintain backwards compatibility.
+   >`do_not_generate_tokens_for_opted_out()` applies `optout_check=1` in the [/token/generate](https://unifiedid.com/docs/endpoints/post-token-generate) call. Without this, `optout_check` is omitted to maintain backwards compatibility.
 
 ### Standard Integration
 
@@ -175,3 +175,6 @@ make example_auto_refresh BASE_URL=https://prod.uidapi.com AUTH_KEY=my-auth-key
 ### 2.2.0 (07/26/2023)
  * Added support for /token/generate
  * Added support for /token/refresh
+
+### 2.3.0 (10/11/2023)
+ * Update from deprecated "policy" parameter to "optout_check" parameter
diff --git a/tests/test_publisher_client.py b/tests/test_publisher_client.py
index d312a6a..b117802 100644
--- a/tests/test_publisher_client.py
+++ b/tests/test_publisher_client.py
@@ -1,3 +1,4 @@
+import json
 import os
 import unittest
 
@@ -56,6 +57,7 @@ def test_integration_optout_generate_token(self):
         publisher_client = Uid2PublisherClient(self.EUID_BASE_URL, self.EUID_API_KEY, self.EUID_SECRET_KEY)
         tc_string = "CPhJRpMPhJRpMABAMBFRACBoALAAAEJAAIYgAKwAQAKgArABAAqAAA"
         input = TokenGenerateInput.from_email("optout@example.com").do_not_generate_tokens_for_opted_out().with_transparency_and_consent_string(tc_string)
+        self.assertEqual(1, json.loads(input.get_as_json_string())['optout_check'])
         token_generate_response = publisher_client.generate_token(input)
         self.assertTrue(token_generate_response.is_optout())
         self.assertFalse(token_generate_response.is_success())
diff --git a/uid2_client/token_generate_input.py b/uid2_client/token_generate_input.py
index 8b71edf..06cf366 100644
--- a/uid2_client/token_generate_input.py
+++ b/uid2_client/token_generate_input.py
@@ -62,7 +62,7 @@ def _create_json_request_for_generate_token(property, value, tc_string, generate
         if tc_string is not None:
             json_object["tcf_consent_string"] = tc_string
         if not generate_for_opted_out:
-            json_object["policy"] = 1
+            json_object["optout_check"] = 1
         return json.dumps(json_object)
 
     def create_hashed_json_request_for_generate_token(self):