diff --git a/extra/cantor/PKGBUILD b/extra/cantor/PKGBUILD
index e7af733ff..17762343f 100644
--- a/extra/cantor/PKGBUILD
+++ b/extra/cantor/PKGBUILD
@@ -6,7 +6,7 @@
 #  - drop julia make/optdepends, doesn't build on ARM
 
 pkgname=cantor
-pkgver=20.12.1
+pkgver=20.12.2
 pkgrel=1
 pkgdesc="KDE Frontend to Mathematical Software"
 url="https://kde.org/applications/education/cantor/"
@@ -23,10 +23,11 @@ optdepends=('maxima: Maxima backend'
             'sagemath: SageMath backend'
             'julia: Julia backend')
 source=("https://download.kde.org/stable/release-service/$pkgver/src/$pkgname-$pkgver.tar.xz"{,.sig})
-sha256sums=('a21ff38afaeb9cd55ef0b99cbaff4b6e9c3bc1322065c1310821e3fa58a546e2'
+sha256sums=('977832abfd56df15db124fbaba18de5ecbfb7ca4951bcb1ce10dea6e801aa1f0'
             'SKIP')
 validpgpkeys=(CA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7  # Albert Astals Cid <aacid@kde.org>
-              F23275E4BF10AFC1DF6914A6DBD2CE893E2D1C87) # Christoph Feck <cfeck@kde.org>
+              F23275E4BF10AFC1DF6914A6DBD2CE893E2D1C87  # Christoph Feck <cfeck@kde.org>
+              D81C0CB38EB725EF6691C385BB463350D6EF31EF) # Heiko Becker <heiko.becker@kde.org>
 
 build() {
   cmake -B build -S $pkgname-$pkgver \