diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9974d550..ee191cdb4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,30 @@ Everybody thinks that the others will donate, but in the end, nobody does.
 
 So if you think that lego is worth it, please consider [donating](https://donate.ldez.dev).
 
+## v4.31.0
+
+- Release date: 2026-01-08
+- Tag: [v4.31.0](https://github.com/go-acme/lego/releases/tag/v4.31.0)
+
+### Added
+
+- **[dnsprovider]** Add DNS provider for ISPConfig
+- **[dnsprovider]** Add DNS Provider for ISPConfig (DDNS Module)
+- **[dnsprovider]** Add DNS provider for Alwaysdata
+- **[dnsprovider]** Add DNS provider for JDCloud
+- **[dnsprovider]** Add DNS provider for 35.com/三五互联
+- **[dnsprovider]** f5xc: add an option to configure the domain of the server
+
+### Changed
+
+- **[lib]** feat: improve ACME error types
+- **[dnsprovider,cname]** namedotcom: follow CNAME
+
+### Fixed
+
+- **[dnsprovider]** hetzner: fix compatibility with _FILE suffix
+- **[dnsprovider]** gandiv5: fix API Key header
+
 ## v4.30.1
 
 - Release date: 2025-12-16
diff --git a/acme/api/internal/sender/useragent.go b/acme/api/internal/sender/useragent.go
index 25443fa05..6b1ebb1c7 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/4.30.1"
+	ourUserAgent = "xenolf-acme/4.31.0"
 
 	// 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 da867f0cd..f3fb3d253 100644
--- a/cmd/lego/zz_gen_version.go
+++ b/cmd/lego/zz_gen_version.go
@@ -2,7 +2,7 @@
 
 package main
 
-const defaultVersion = "v4.30.1+dev-detach"
+const defaultVersion = "v4.31.0+dev-release"
 
 var version = ""
 
diff --git a/providers/dns/internal/useragent/useragent.go b/providers/dns/internal/useragent/useragent.go
index 4f8e693c2..480c35af1 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/4.30.1"
+	ourUserAgent = "goacme-lego/4.31.0"
 
 	// 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.