diff --git a/openapi.yaml b/openapi.yaml
index 89381843..51c72f05 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -8934,6 +8934,7 @@ components:
                         The number of dimensions the resulting output embeddings should have. Only supported in `text-embedding-3` and later models.
                     type: integer
                     minimum: 1
+                    nullable: true
                 user: *end_user_param_configuration
             required:
                 - model