diff --git a/.last-synced-sha b/.last-synced-sha
index 68f49b1..1f80e86 100644
--- a/.last-synced-sha
+++ b/.last-synced-sha
@@ -1 +1 @@
-602d9f70df4f107aa8b4366ef3cf140bd81212c3
+47bcae12b5f6645e1a33184346e7e8d8df7b9ec8
diff --git a/spec/open-api-spec.yaml b/spec/open-api-spec.yaml
index 3c71b83..ad1b4cf 100644
--- a/spec/open-api-spec.yaml
+++ b/spec/open-api-spec.yaml
@@ -31132,6 +31132,14 @@ components:
             - authorization_code
             - urn:ietf:params:oauth:grant-type:token-exchange
           example: authorization_code
+        code_verifier:
+          type: string
+          description: >-
+            The PKCE code verifier matching the `code_challenge` sent with the
+            authorization request. Required when the authorization request
+            included a `code_challenge`. Must be sent in the request body.
+          example: code_verifier_value
+          format: password
         subject_token:
           type: string
           description: >-