diff --git a/srcpkgs/monocypher/template b/srcpkgs/monocypher/template
index f5f201c8022..6ad9ac716e1 100644
--- a/srcpkgs/monocypher/template
+++ b/srcpkgs/monocypher/template
@@ -1,6 +1,6 @@
 # Template file for 'monocypher'
 pkgname=monocypher
-version=3.1.3
+version=4.0.0
 revision=1
 build_style=gnu-makefile
 short_desc="Easy to use crypto library inspired by libsodium and TweetNaCl"
@@ -9,7 +9,7 @@ license="BSD-2-Clause, CC0-1.0"
 homepage="https://monocypher.org"
 changelog="https://monocypher.org/changelog"
 distfiles="https://monocypher.org/download/monocypher-${version}.tar.gz"
-checksum=b442b577df28f8c36caa01d9ae9011b5dd9c717d94be520168a04e36d7f5016e
+checksum=99e0b2403d4313eb0a13364480961a1a4ce2434e99e9478ca2f2ac4152f0ad52
 
 post_install() {
 	vlicense LICENCE.md