diff --git a/CHANGELOG.md b/CHANGELOG.md
index 437702ae..abe91e16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,17 +5,26 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [1.0.0] - 2019-01-28
+
+### Breaking changes
+- `ipam.json` adds new mandatory field `bmc-ipv4-gateway-offset` (#132).
+- Ignition template renderer sets the context `.` as `Machine` instead of `MachineSpec` (#132).
+
+### Added
+- `Machine` has additional information field for BMC NIC configuration (#132).
+
 ## [0.31] - 2018-12-25
 
 ### Changed
-* Update github.com/coreos/ignition to v0.30.0 and spec version v2.3.0 (#127).
+- Update github.com/coreos/ignition to v0.30.0 and spec version v2.3.0 (#127).
 - Use cobra in for sabactl (#129).
 - Fix being suck on registering ignitions with already registed ID and ROLE (#130).
 
 ## [0.30] - 2018-12-06
 
 ### Added
-* client: aliases to type in `sabakan` package.
+- client: aliases to type in `sabakan` package.
 
 ## [0.29] - 2018-11-29
 
@@ -113,7 +122,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Fix a bug that leaves files of deleted OS images (#86).
 
 [placemat]: https://github.com/cybozu-go/placemat
-[Unreleased]: https://github.com/cybozu-go/sabakan/compare/v0.31...HEAD
+[Unreleased]: https://github.com/cybozu-go/sabakan/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/cybozu-go/sabakan/compare/v0.31...v1.0.0
 [0.31]: https://github.com/cybozu-go/sabakan/compare/v0.30...v0.31
 [0.30]: https://github.com/cybozu-go/sabakan/compare/v0.29...v0.30
 [0.29]: https://github.com/cybozu-go/sabakan/compare/v0.28...v0.29
diff --git a/version.go b/version.go
index 961df04f..00a444b7 100644
--- a/version.go
+++ b/version.go
@@ -1,4 +1,4 @@
 package sabakan
 
 // Version is sabakan version
-const Version = "0.31"
+const Version = "1.0.0"