diff --git a/scripts/purge-syntax-kv.ts b/scripts/purge-syntax-kv.ts
new file mode 100644
index 0000000..28ba422
--- /dev/null
+++ b/scripts/purge-syntax-kv.ts
@@ -0,0 +1,58 @@
+/**
+ * Run by issuing `deno run -A scripts/purge-syntax-kv.ts` from the root of the repo.
+ *
+ * This script will delete all keys in the KV_HIGHLIGHT binding that do not start with the current syntax version.
+ */
+
+import * as toml from "jsr:@std/toml";
+
+const wranglerToml = await Deno.readTextFile("./wrangler.toml");
+const config = toml.parse(wranglerToml) as { vars: { SYNTAX_VERSION: string } };
+const SYNTAX_VERSION = config.vars.SYNTAX_VERSION;
+
+const listCommand = new Deno.Command("wrangler", {
+  args: ["kv:key", "list", "--binding", "KV_HIGHLIGHT"],
+});
+
+const listResult = await listCommand.output();
+const keys = JSON.parse(new TextDecoder().decode(listResult.stdout).trim()).map(
+  (k) => k.name
+);
+
+const keysToDelete = keys.filter(
+  (key) => !key.startsWith(`${SYNTAX_VERSION}:`)
+);
+
+if (keysToDelete.length > 0) {
+  const deleteKeysJson = JSON.stringify(keysToDelete);
+  await Deno.writeTextFile("delete-keys.json", deleteKeysJson);
+
+  console.log(`Found ${keysToDelete.length} keys to delete. Deleting...`);
+
+  const deleteCommand = new Deno.Command("wrangler", {
+    args: [
+      "kv",
+      "bulk",
+      "delete",
+      "--binding",
+      "KV_HIGHLIGHT",
+      "delete-keys.json",
+    ],
+  });
+
+  const deleteResult = await deleteCommand.output();
+
+  if (deleteResult.success) {
+    console.log("Keys deleted successfully.");
+  } else {
+    console.error(
+      "Failed to delete keys:",
+      new TextDecoder().decode(deleteResult.stderr)
+    );
+  }
+
+  // Clean up the temporary file
+  await Deno.remove("delete-keys.json");
+} else {
+  console.log("No keys to delete.");
+}