diff --git a/R/00-update_refs.R b/R/00-update_refs.R
index 311bfc21b..ffdbcf912 100644
--- a/R/00-update_refs.R
+++ b/R/00-update_refs.R
@@ -102,7 +102,13 @@ check_year_valid <- function(
 #'
 #' @family initialisation
 get_dd_period <- function() {
-  "Jul16_Sep24"
+
+  first_part <- substr(previous_update(), 1, 3)
+  end_part <- substr(previous_update(), 7, 8)
+
+  dd_period <- as.character(stringr::str_glue('Jul16_{first_part}{end_part}'))
+
+  return(dd_period)
 }