diff --git a/CHANGELOG.md b/CHANGELOG.md
index b1f2807c..99808551 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## [2.4.0] 2021-12-21
 
 ### Added
 - Function to verify a detached signature and get its creation time: 
@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 func (keyRing *KeyRing) GetVerifiedSignatureTimestamp(message *PlainMessage, signature *PGPSignature, verifyTime int64) (int64, error)
 ```
 
+### Changed
+- Updated the underlying crypto library
+
 ## [2.3.1] 2021-12-15
 ### Fixed
 - Fix the verification of PGP/MIME message signatures:
diff --git a/constants/armor.go b/constants/armor.go
index 767988eb..87174f88 100644
--- a/constants/armor.go
+++ b/constants/armor.go
@@ -3,7 +3,7 @@ package constants
 
 // Constants for armored data.
 const (
-	ArmorHeaderVersion = "GopenPGP 2.3.1"
+	ArmorHeaderVersion = "GopenPGP 2.4.0"
 	ArmorHeaderComment = "https://gopenpgp.org"
 	PGPMessageHeader   = "PGP MESSAGE"
 	PGPSignatureHeader = "PGP SIGNATURE"
diff --git a/constants/version.go b/constants/version.go
index 8fc495e2..6fb07cfe 100644
--- a/constants/version.go
+++ b/constants/version.go
@@ -1,3 +1,3 @@
 package constants
 
-const Version = "2.3.1"
+const Version = "2.4.0"
diff --git a/go.mod b/go.mod
index c94c4cef..85384113 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/ProtonMail/gopenpgp/v2
 go 1.15
 
 require (
-	github.com/ProtonMail/go-crypto v0.0.0-20211112122917-428f8eabeeb3
+	github.com/ProtonMail/go-crypto v0.0.0-20211221144345-a4f6767435ab
 	github.com/ProtonMail/go-mime v0.0.0-20190923161245-9b5a4261663a
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.4.0
diff --git a/go.sum b/go.sum
index 6546f882..b75837af 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,8 @@
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/ProtonMail/go-crypto v0.0.0-20211112122917-428f8eabeeb3 h1:XcF0cTDJeiuZ5NU8w7WUDge0HRwwNRmxj/GGk6KSA6g=
 github.com/ProtonMail/go-crypto v0.0.0-20211112122917-428f8eabeeb3/go.mod h1:z4/9nQmJSSwwds7ejkxaJwO37dru3geImFUdJlaLzQo=
+github.com/ProtonMail/go-crypto v0.0.0-20211221144345-a4f6767435ab h1:5FiL/TCaiKCss/BLMIACDxxadYrx767l9kh0qYX+sLQ=
+github.com/ProtonMail/go-crypto v0.0.0-20211221144345-a4f6767435ab/go.mod h1:z4/9nQmJSSwwds7ejkxaJwO37dru3geImFUdJlaLzQo=
 github.com/ProtonMail/go-mime v0.0.0-20190923161245-9b5a4261663a h1:W6RrgN/sTxg1msqzFFb+G80MFmpjMw61IU+slm+wln4=
 github.com/ProtonMail/go-mime v0.0.0-20190923161245-9b5a4261663a/go.mod h1:NYt+V3/4rEeDuaev/zw1zCq8uqVEuPHzDPo3OZrlGJ4=
 github.com/ProtonMail/go-mobile v0.0.0-20210326110230-f181c70e4e2b h1:XVeh08xp93T+xK6rzpCSQTZ+LwEo+ASHvOifrQ5ZgEE=