diff --git a/CHANGELOG.md b/CHANGELOG.md
index 17bbed6..efad1c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ## [Unreleased]
 
+## [1.2.0] - 2026-07-17
+
 ### Added
 
 - `Adventure.monsters` — an adventure document can bundle its own custom `MonsterTemplate`s, which join the shipped catalog for that adventure's sessions everywhere the engine resolves template ids: keyed encounters, `SpawnMonsters`, inline wandering tables, listen checks, and `GameSession.spawn`. Downstream of spawn nothing changes — combat, XP, treasure, persistence, and replay carry bundled monsters unmodified. Bundled ids must not collide with the shipped catalog or each other; collisions fail `validate_adventure` (and, for doctored saves, `load_game`) with `ContentValidationError`. The session exposes the union as the read-only `GameSession.effective_monsters` property.
@@ -36,6 +38,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 - The documentation site: quickstart, guides, front-end walk-throughs, and a full reference for every command, event, rejection code, message code, RNG stream, and content id.
 - The typed surface: complete type hints under `py.typed`, checked in CI.
 
-[Unreleased]: https://github.com/mmacy/osrlib-python/compare/v1.1.0...HEAD
+[Unreleased]: https://github.com/mmacy/osrlib-python/compare/v1.2.0...HEAD
+[1.2.0]: https://github.com/mmacy/osrlib-python/compare/v1.1.0...v1.2.0
 [1.1.0]: https://github.com/mmacy/osrlib-python/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/mmacy/osrlib-python/releases/tag/v1.0.0
diff --git a/pyproject.toml b/pyproject.toml
index e9367ac..4cf8dda 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "osrlib"
-version = "1.1.0"
+version = "1.2.0"
 description = "B/X (1981 Basic/Expert) tabletop RPG rules engine for turn-based dungeon crawlers"
 readme = "README.md"
 # The wheel ships Open Game Content (osrlib/data/*.json and its LICENSE-OGL.md
diff --git a/uv.lock b/uv.lock
index 32be0d4..7c87f1d 100644
--- a/uv.lock
+++ b/uv.lock
@@ -487,7 +487,7 @@ wheels = [
 
 [[package]]
 name = "osrlib"
-version = "1.1.0"
+version = "1.2.0"
 source = { editable = "." }
 dependencies = [
     { name = "pydantic" },