diff --git a/node-print/APKBUILD b/node-print/APKBUILD
index fa089fb..b341112 100644
--- a/node-print/APKBUILD
+++ b/node-print/APKBUILD
@@ -1,7 +1,7 @@
 # Contributor: Patrycja Rosa <alpine@ptrcnull.me>
 # Maintainer: Patrycja Rosa <alpine@ptrcnull.me>
 pkgname=node-print
-pkgver=12
+pkgver=13
 pkgrel=0
 pkgdesc="another terrible javascript engine wrapper"
 url="https://git.ddd.rip/ptrcnull/ptrcports"
diff --git a/node-print/index.js b/node-print/index.js
index 9975642..6af3afa 100644
--- a/node-print/index.js
+++ b/node-print/index.js
@@ -148,6 +148,11 @@ Set.prototype.intersection = function(other) {
 	return new Set([...this].filter(el => other.has(el)))
 }
 
+Set.prototype.difference = function(other) {
+	if (!other || !(other instanceof Set)) throw new TypeError('other must be a Set')
+	return new Set([...this].filter(el => !other.has(el)))
+}
+
 Set.prototype.at = function(index) {
 	return [...this].at(index)
 }
diff --git a/node-print/test.js b/node-print/test.js
index 5f04c53..e323b8c 100644
--- a/node-print/test.js
+++ b/node-print/test.js
@@ -196,6 +196,19 @@ test('Set.prototype.intersection', t => {
     )
 })
 
+test('Set.prototype.difference', t => {
+    const left = new Set([1, 2, 3])
+    const right = new Set([2, 4])
+    assert.deepEqual(
+        new Set([1, 3]),
+        left.difference(right)
+    )
+    assert.deepEqual(
+        new Set([4]),
+        right.difference(left)
+    )
+})
+
 test('Set.prototype.at - single element', t => {
     assert.equal(
         2,