diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5be646f..bdd07ac5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,26 @@
 # Changelog
 
+## [v4.21.0](https://github.com/go-acme/lego/releases/tag/v4.21.0) (2024-12-20)
+
+### Added
+
+- **[dnsprovider]** Add DNS provider for Rainyun/雨云
+- **[dnsprovider]** Add DNS provider for West.cn/西部数码
+- **[dnsprovider]** Add DNS provider for ManageEngine CloudDNS
+- **[cli]** feat: add --force-cert-domains flag to renew
+
+### Fixed
+
+- **[cli]** create client only when needed
+- **[cli]** clone the transport with tls-skip-verify
+- **[cli]** use retryable client for ACME server calls
+- **[dnsprovider]** bunny: fix zone detection
+- **[dnsprovider]** inwx: delete only the TXT record related to the DNS challenge
+- **[dnsprovider]** infomaniak: increase default propagation timeout
+- **[dnsprovider]** dnsmadeeasy: use default transport
+- **[dnsprovider]** netcup: increase default propagation values
+- **[dnsprovider]** otc: use default transport
+
 ## [v4.20.4](https://github.com/go-acme/lego/releases/tag/v4.20.4) (2024-11-21)
 
 Publish the Snap to the Snapcraft stable channel.
diff --git a/acme/api/internal/sender/useragent.go b/acme/api/internal/sender/useragent.go
index 6755fe77..a1e8c68a 100644
--- a/acme/api/internal/sender/useragent.go
+++ b/acme/api/internal/sender/useragent.go
@@ -4,10 +4,10 @@ package sender
 
 const (
 	// ourUserAgent is the User-Agent of this underlying library package.
-	ourUserAgent = "xenolf-acme/4.20.4"
+	ourUserAgent = "xenolf-acme/4.21.0"
 
 	// ourUserAgentComment is part of the UA comment linked to the version status of this underlying library package.
 	// values: detach|release
 	// NOTE: Update this with each tagged release.
-	ourUserAgentComment = "detach"
+	ourUserAgentComment = "release"
 )
diff --git a/cmd/lego/zz_gen_version.go b/cmd/lego/zz_gen_version.go
index d449e84c..c23e0d03 100644
--- a/cmd/lego/zz_gen_version.go
+++ b/cmd/lego/zz_gen_version.go
@@ -2,7 +2,7 @@
 
 package main
 
-const defaultVersion = "v4.20.4+dev-detach"
+const defaultVersion = "v4.21.0+dev-release"
 
 var version = ""
 
diff --git a/providers/dns/internal/useragent/useragent.go b/providers/dns/internal/useragent/useragent.go
index 987dfcad..30b7f692 100644
--- a/providers/dns/internal/useragent/useragent.go
+++ b/providers/dns/internal/useragent/useragent.go
@@ -10,12 +10,12 @@ import (
 
 const (
 	// ourUserAgent is the User-Agent of this underlying library package.
-	ourUserAgent = "goacme-lego/4.20.4"
+	ourUserAgent = "goacme-lego/4.21.0"
 
 	// ourUserAgentComment is part of the UA comment linked to the version status of this underlying library package.
 	// values: detach|release
 	// NOTE: Update this with each tagged release.
-	ourUserAgentComment = "detach"
+	ourUserAgentComment = "release"
 )
 
 // Get builds and returns the User-Agent string.