diff --git a/CHANGELOG.md b/CHANGELOG.md
index 197aa3b7..9028c846 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,30 @@
 # Changelog
 
+## [v3.4.0] - 2020-02-25
+
+### Added:
+
+- **[dnsprovider]** Add DNS provider for Constellix
+- **[dnsprovider]** Add DNS provider for Servercow.
+- **[dnsprovider]** Add DNS provider for Scaleway
+- **[cli]** Add "LEGO_PATH" environment variable
+
+### Changed:
+
+- **[dnsprovider]** route53: allow custom client to be provided
+- **[dnsprovider]** namecheap: allow external domains
+- **[dnsprovider]** namecheap: add sandbox support.
+- **[dnsprovider]** ovh: Improve provider documentation
+- **[dnsprovider]** route53: Improve provider documentation
+
+### Fixed:
+
+- **[dnsprovider]** zoneee: fix subdomains.
+- **[dnsprovider]** designate: Don't clean up managed records like SOA and NS
+- **[dnsprovider]** dnspod: update lib.
+- **[lib]** crypto: Treat CommonName as optional
+- **[lib]** chore: update cenkalti/backoff to v4.
+
 ## [v3.3.0] - 2020-01-08
 
 ### Added:
diff --git a/acme/api/internal/sender/useragent.go b/acme/api/internal/sender/useragent.go
index 2f27d7f0..4c9896bb 100644
--- a/acme/api/internal/sender/useragent.go
+++ b/acme/api/internal/sender/useragent.go
@@ -5,10 +5,10 @@ package sender
 
 const (
 	// ourUserAgent is the User-Agent of this underlying library package.
-	ourUserAgent = "xenolf-acme/3.3.0"
+	ourUserAgent = "xenolf-acme/3.4.0"
 
 	// 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"
 )