diff --git a/README.org b/README.org
index 11e947e7..75450d33 100644
--- a/README.org
+++ b/README.org
@@ -3557,7 +3557,8 @@ I'd like to start learning and using rust if I can.
   ;; comment to disable rustfmt on save
   (setq rustic-format-on-save t
         rustic-lsp-client 'eglot
-        rustic-clippy-arguments "-- -W clippy::pedantic -W clippy::nursery -W clippy::unwrap_used")
+        rustic-clippy-arguments "-- -W clippy::pedantic -W clippy::nursery -W clippy::unwrap_used"
+        rustic-rustfmt-args '("--edition" "2021"))
   (advice-add 'eglot-completion-at-point :around #'cape-wrap-buster)
   (add-to-list 'compilation-error-regexp-alist rustic-compilation-error)
   (add-to-list 'compilation-error-regexp-alist rustic-compilation-warning)
diff --git a/init.el b/init.el
index e1e2918c..0d63f7a9 100644
--- a/init.el
+++ b/init.el
@@ -2599,7 +2599,8 @@ targets."
   ;; comment to disable rustfmt on save
   (setq rustic-format-on-save t
         rustic-lsp-client 'eglot
-        rustic-clippy-arguments "-- -W clippy::pedantic -W clippy::nursery -W clippy::unwrap_used")
+        rustic-clippy-arguments "-- -W clippy::pedantic -W clippy::nursery -W clippy::unwrap_used"
+        rustic-rustfmt-args '("--edition" "2021"))
   (advice-add 'eglot-completion-at-point :around #'cape-wrap-buster)
   (add-to-list 'compilation-error-regexp-alist rustic-compilation-error)
   (add-to-list 'compilation-error-regexp-alist rustic-compilation-warning)