diff --git a/lib/parser.js b/lib/parser.js
index 8212476d..4a60c663 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -1,4 +1,4 @@
-// @generated by Peggy 4.1.0-pre.0.
+// @generated by Peggy 4.1.0-pre.1.
 //
 // https://peggyjs.org/
 
diff --git a/lib/version.js b/lib/version.js
index e30a0bcb..7c3e3372 100644
--- a/lib/version.js
+++ b/lib/version.js
@@ -3,4 +3,4 @@
 
 "use strict";
 
-exports.version = "4.1.0-pre.0";
+exports.version = "4.1.0-pre.1";
diff --git a/package.json b/package.json
index 012cc6bf..3d03ecf5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "peggy",
-  "version": "4.1.0-pre.0",
+  "version": "4.1.0-pre.1",
   "description": "Parser generator for JavaScript",
   "keywords": [
     "grammar",