diff --git a/CHANGELOG.md b/CHANGELOG.md
index e79994251..0cfed7906 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Main (unreleased)
 
+- Fix BUILDPACK_VENDOR_URL support (https://github.com/heroku/heroku-buildpack-ruby/pull/1406)
+
 ## v262 (2023/11/08)
 
 - Warn when relying on default Node.js or Yarn versions (https://github.com/heroku/heroku-buildpack-ruby/pull/1401)
diff --git a/bin/support/download_ruby b/bin/support/download_ruby
index 37737ba8d..d3087b175 100755
--- a/bin/support/download_ruby
+++ b/bin/support/download_ruby
@@ -26,7 +26,7 @@ curl_retry_on_18() {
 regex=".*ruby_version = [\'\"]([0-9]+\.[0-9]+\.[0-9]+)[\'\"].*"
 if [[ $(cat "$BIN_DIR/../buildpack.toml") =~ $regex ]]
   then
-    heroku_buildpack_ruby_url="https://heroku-buildpack-ruby.s3.us-east-1.amazonaws.com/$STACK/ruby-${BASH_REMATCH[1]}.tgz"
+    heroku_buildpack_ruby_url="${BUILDPACK_VENDOR_URL:-https://heroku-buildpack-ruby.s3.us-east-1.amazonaws.com}/$STACK/ruby-${BASH_REMATCH[1]}.tgz"
   else
     echo "Could not detect ruby version to bootstrap"
     exit 1