diff --git a/new-version.rb b/new-version.rb
index 325d179..77bdaa3 100644
--- a/new-version.rb
+++ b/new-version.rb
@@ -1,6 +1,6 @@
-engine, version = ARGV.fetch(0).split('-', 2)
+engine_input, version = ARGV.fetch(0).split('-', 2)
 
-MATCH = case engine
+MATCH = case engine_input
 when 'ruby', 'jruby'
   /^\d+\.\d+\./
 when 'truffleruby'
@@ -9,41 +9,49 @@ end
 
 raise unless version[MATCH]
 
-# Update ruby-builder-versions.json
-file = "#{__dir__}/ruby-builder-versions.json"
-lines = File.readlines(file, chomp: true)
+engines = [engine_input]
+engines << 'truffleruby+graalvm' if engine_input == 'truffleruby'
 
-from = lines.index { |line| line =~ /"#{engine}": \[/ }
-to = from
-to += 1 until lines[to].include?(']')
+engines.each do |engine|
+  puts engine
 
-from += 1 # [
-to -= 2 # head, ]
+  # Update ruby-builder-versions.json
+  file = "#{__dir__}/ruby-builder-versions.json"
+  lines = File.readlines(file, chomp: true)
 
-puts lines[from..to]
+  from = lines.index { |line| line.include?(%{"#{engine}": [}) }
+  raise "Could not find start of #{engine}" unless from
+  to = from
+  to += 1 until lines[to].include?(']')
 
-release_line = lines[from..to].find { |line|
-  v = line[/"([^"]+)"/, 1] and v[MATCH] == version[MATCH]
-}
+  from += 1 # [
+  to -= 2 # head, ]
 
-if release_line
-  append = " #{version.inspect},"
-  release_line << append unless release_line.end_with?(append)
-else
-  lines.insert to+1, "    #{version.inspect},"
-end
+  puts lines[from..to]
 
-File.write(file, lines.join("\n") + "\n")
+  release_line = lines[from..to].find { |line|
+    v = line[/"([^"]+)"/, 1] and v[MATCH] == version[MATCH]
+  }
 
-# Update README.md
-file = "#{__dir__}/README.md"
-lines = File.readlines(file)
-engine_line = lines.find { |line| line.start_with?("| `#{engine}`") }
-engine_line.sub!(/(.+ (?:-|until)) (\d+(?:\.\d+)+)/) do
-  if Gem::Version.new(version) > Gem::Version.new($2)
-    "#{$1} #{version}"
+  if release_line
+    append = " #{version.inspect},"
+    release_line << append unless release_line.end_with?(append)
   else
-    $&
+    lines.insert to+1, "    #{version.inspect},"
   end
+
+  File.write(file, lines.join("\n") + "\n")
+
+  # Update README.md
+  file = "#{__dir__}/README.md"
+  lines = File.readlines(file)
+  engine_line = lines.find { |line| line.start_with?("| `#{engine}`") }
+  engine_line.sub!(/(.+ (?:-|until)) (\d+(?:\.\d+)+)/) do
+    if Gem::Version.new(version) > Gem::Version.new($2)
+      "#{$1} #{version}"
+    else
+      $&
+    end
+  end
+  File.write(file, lines.join)
 end
-File.write(file, lines.join)