diff --git a/group_vars/matrix_servers b/group_vars/matrix_servers
index 2bdc0b409..44345eb7e 100755
--- a/group_vars/matrix_servers
+++ b/group_vars/matrix_servers
@@ -218,9 +218,6 @@ matrix_addons_homeserver_container_network: "{{ matrix_playbook_reverse_proxy_co
 matrix_addons_homeserver_client_api_url: "{{ ('http://' + matrix_playbook_reverse_proxy_hostname + ':' + matrix_playbook_internal_matrix_client_api_traefik_entrypoint_port | string) if matrix_playbook_internal_matrix_client_api_traefik_entrypoint_enabled else matrix_homeserver_container_url }}"
 matrix_addons_homeserver_systemd_services_list: "{{ ([traefik_identifier + '.service'] if matrix_playbook_reverse_proxy_type == 'playbook-managed-traefik' else []) if matrix_playbook_internal_matrix_client_api_traefik_entrypoint_enabled else matrix_homeserver_systemd_services_list }}"
 
-# Starting from version `0.6.0` Conduit natively supports some sync v3 (sliding-sync) features.
-matrix_homeserver_sliding_sync_url: "{{ matrix_sliding_sync_base_url if matrix_sliding_sync_enabled else (matrix_homeserver_url if matrix_homeserver_implementation in ['conduit', 'conduwuit', 'continuwuity'] else '') }}"
-
 ########################################################################
 #                                                                      #
 # /base                                                                #
@@ -5711,8 +5708,6 @@ matrix_static_files_container_labels_base_domain_root_path_redirection_url: "{{
 
 matrix_static_files_file_matrix_client_property_io_element_jitsi_preferred_domain: "{{ matrix_server_fqn_jitsi if jitsi_enabled else '' }}"
 
-matrix_static_files_file_matrix_client_property_org_matrix_msc3575_proxy_url: "{{ matrix_homeserver_sliding_sync_url }}"
-
 matrix_static_files_file_matrix_client_property_org_matrix_msc2965_authentication_enabled: "{{ matrix_authentication_service_enabled }}"
 matrix_static_files_file_matrix_client_property_org_matrix_msc2965_authentication_issuer: "{{ matrix_authentication_service_config_http_issuer if matrix_authentication_service_enabled else '' }}"
 matrix_static_files_file_matrix_client_property_org_matrix_msc2965_authentication_account: "{{ matrix_authentication_service_account_management_url if matrix_authentication_service_enabled else '' }}"
diff --git a/roles/custom/matrix-base/defaults/main.yml b/roles/custom/matrix-base/defaults/main.yml
index 0fefb7300..8b4eba5a7 100644
--- a/roles/custom/matrix-base/defaults/main.yml
+++ b/roles/custom/matrix-base/defaults/main.yml
@@ -234,12 +234,6 @@ matrix_homeserver_container_federation_url: "http://{{ matrix_homeserver_contain
 # This likely gets overridden elsewhere.
 matrix_homeserver_container_federation_api_endpoint: ""
 
-# Specifies the public url of the Sync v3 (sliding-sync) API.
-# This will be used to set the `org.matrix.msc3575.proxy` property in `/.well-known/matrix/client`.
-# Once the API is stabilized, this will no longer be required.
-# See MSC3575: https://github.com/matrix-org/matrix-spec-proposals/blob/kegan/sync-v3/proposals/3575-sync.md
-matrix_homeserver_sliding_sync_url: ""
-
 matrix_identity_server_url: ~
 
 matrix_integration_manager_rest_url: ~