google-deepmind · dylantirandaz · Mar 23, 2026
diff --git a/docs/api/utilities.rst b/docs/api/utilities.rst
@@ -65,28 +65,6 @@ Non-negative least squares
 .. autofunction:: nnls
 
 
-Second Order Optimization
--------------------------
-
-.. currentmodule:: optax.second_order
-
-.. autosummary::
-    fisher_diag
-    hessian_diag
-    hvp
-
-Fisher diagonal
-~~~~~~~~~~~~~~~
-.. autofunction:: fisher_diag
-
-Hessian diagonal
-~~~~~~~~~~~~~~~~
-.. autofunction:: hessian_diag
-
-Hessian vector product
-~~~~~~~~~~~~~~~~~~~~~~
-.. autofunction:: hvp
-
 
 Tree
 ----

diff --git a/optax/CHANGELOG.md b/optax/CHANGELOG.md
@@ -5,6 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Removed
+
+- Removed deprecated `optax.second_order.hvp`, `optax.second_order.hessian_diag`,
+  and `optax.second_order.fisher_diag`. These were deprecated in 0.2.7 and
+  scheduled for removal in 0.2.9.
+
 ## [0.2.8] - 2026-03-20
 
 ### Changed

diff --git a/optax/second_order/__init__.py b/optax/second_order/__init__.py
@@ -13,9 +13,3 @@
 # limitations under the License.
 # ==============================================================================
 """The second order optimization sub-package."""
-
-# pylint: disable=g-importing-member
-
-from optax.second_order._deprecated import fisher_diag
-from optax.second_order._deprecated import hessian_diag
-from optax.second_order._deprecated import hvp
diff --git a/optax/second_order/_deprecated.py b/optax/second_order/_deprecated.py