diff --git a/package.json b/package.json
index 27de0d75..9fc113db 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "simple-icons",
-  "version": "13.8.0",
+  "version": "13.9.0",
   "description": "SVG icons for popular brands https://simpleicons.org",
   "homepage": "https://simpleicons.org",
   "keywords": [
diff --git a/slugs.md b/slugs.md
index 038ca573..bb4b6655 100644
--- a/slugs.md
+++ b/slugs.md
@@ -439,6 +439,7 @@ update the script at 'scripts/release/update-slugs-table.js'.
 | `Bugsnag` | `bugsnag` |
 | `Buhl` | `buhl` |
 | `Buildkite` | `buildkite` |
+| `BuiltByBit` | `builtbybit` |
 | `Bukalapak` | `bukalapak` |
 | `Bulma` | `bulma` |
 | `Bun` | `bun` |
@@ -1641,6 +1642,7 @@ update the script at 'scripts/release/update-slugs-table.js'.
 | `Mahindra` | `mahindra` |
 | `mail.com` | `maildotcom` |
 | `Mail.Ru` | `maildotru` |
+| `mailbox.org` | `mailboxdotorg` |
 | `MailChimp` | `mailchimp` |
 | `Mailgun` | `mailgun` |
 | `Mailtrap` | `mailtrap` |