diff --git a/CHANGELOG.md b/CHANGELOG.md
index abe5b2f..afc142e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,23 @@ Released YYYY-MM-DD.
 
 --------------------------------------------------------------------------------
 
+## 3.12.0
+
+Released 2023-01-17.
+
+### Added
+
+* Added the `bumpalo::boxed::Box::bump` and `bumpalo::collections::String::bump`
+  getters to get the underlying `Bump` that a string or box was allocated into.
+
+### Changed
+
+* Some uses of `Box` that MIRI did not previously consider as UB are now
+  reported as UB, and `bumpalo`'s internals have been adjusted to avoid the new
+  UB.
+
+--------------------------------------------------------------------------------
+
 ## 3.11.1
 
 Released 2022-10-18.
diff --git a/Cargo.toml b/Cargo.toml
index 703a9a8..c47627a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ license = "MIT/Apache-2.0"
 name = "bumpalo"
 readme = "README.md"
 repository = "https://github.com/fitzgen/bumpalo"
-version = "3.11.1"
+version = "3.12.0"
 exclude = ["/.github/*", "/benches", "/tests", "valgrind.supp", "bumpalo.png"]
 
 [package.metadata.docs.rs]