diff --git a/bin/release b/bin/release
new file mode 100755
index 0000000000000000000000000000000000000000..f92ab006d59e4e2984af263a81ca95708d208ccb
--- /dev/null
+++ b/bin/release
@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+
+var fs = require("fs"), child = require("child_process");
+
+var number, bumpOnly;
+
+for (var i = 2; i < process.argv.length; i++) {
+  if (process.argv[i] == "-bump") bumpOnly = true;
+  else if (/^\d+\.\d+\.\d+$/.test(process.argv[i])) number = process.argv[i];
+  else { console.log("Bogus command line arg: " + process.argv[i]); process.exit(1); }
+}
+
+if (!number) { console.log("Must give a version"); process.exit(1); }
+
+function rewrite(file, f) {
+  fs.writeFileSync(file, f(fs.readFileSync(file, "utf8")), "utf8");
+}
+
+rewrite("lib/codemirror.js", function(lib) {
+  return lib.replace(/CodeMirror\.version = "\d+\.\d+\.\d+"/,
+                     "CodeMirror.version = \"" + number + "\"");
+});
+rewrite("package.json", function(pack) {
+  return pack.replace(/"version":"\d+\.\d+\.\d+"/, "\"version\":\"" + number + "\"");
+});
+
+if (bumpOnly) process.exit(0);
+
+child.exec("bash bin/authors.sh", function(){});
+
+var simple = number.slice(0, number.lastIndexOf("."));
+
+rewrite("doc/compress.html", function(cmp) {
+  return cmp.replace(/<option value="http:\/\/codemirror.net\/">HEAD<\/option>/,
+                     "<option value=\"http://codemirror.net/\">HEAD</option>\n        <option value=\"http://marijnhaverbeke.nl/git/codemirror?a=blob_plain;hb=" + number + ";f=\">" + simple + "</option>");
+});
+
+rewrite("index.html", function(index) {
+  return index.replace(/<strong>version 3.20<\/strong>/,
+                       "<strong>version " + simple + "</strong>");
+});