diff --git a/array_api_compat/__init__.py b/array_api_compat/__init__.py
index 01f33b20..5815fb27 100644
--- a/array_api_compat/__init__.py
+++ b/array_api_compat/__init__.py
@@ -17,6 +17,6 @@
 this implementation for the default when working with NumPy arrays.
 
 """
-__version__ = '1.8'
+__version__ = '1.9'
 
 from .common import *  # noqa: F401, F403
diff --git a/cupy-xfails.txt b/cupy-xfails.txt
index 9c865fad..fb7b03da 100644
--- a/cupy-xfails.txt
+++ b/cupy-xfails.txt
@@ -161,6 +161,7 @@ array_api_tests/test_special_cases.py::test_unary[floor(x_i is -0) -> -0]
 array_api_tests/test_special_cases.py::test_unary[log1p(x_i is -0) -> -0]
 array_api_tests/test_special_cases.py::test_unary[round(x_i is -0) -> -0]
 array_api_tests/test_special_cases.py::test_unary[sin(x_i is -0) -> -0]
+array_api_tests/test_special_cases.py::test_unary[signbit(x_i is -0) -> True]
 array_api_tests/test_special_cases.py::test_unary[sinh(x_i is -0) -> -0]
 array_api_tests/test_special_cases.py::test_unary[sqrt(x_i is -0) -> -0]
 array_api_tests/test_special_cases.py::test_unary[tan(x_i is -0) -> -0]
@@ -172,3 +173,10 @@ array_api_tests/test_special_cases.py::test_unary[trunc(x_i is -0) -> -0]
 array_api_tests/test_fft.py::test_fftn
 array_api_tests/test_fft.py::test_ifftn
 array_api_tests/test_fft.py::test_rfftn
+
+# 2023.12 support
+# cupy.ndaray cannot be specified as `repeats` argument.
+array_api_tests/test_manipulation_functions.py::test_repeat
+array_api_tests/test_signatures.py::test_func_signature[from_dlpack]
+array_api_tests/test_signatures.py::test_func_signature[astype]
+array_api_tests/test_signatures.py::test_array_method_signature[__dlpack__]
diff --git a/docs/changelog.md b/docs/changelog.md
index d3d02da0..d1e67333 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,41 @@
 # Changelog
 
+## 1.9 (2024-10-??)
+
+### Major Changes
+
+- New helper functions to determine if a namespace is from a given library
+  ({func}`~.is_numpy_namespace`, {func}`~.is_torch_namespace`, etc.).
+
+- More support for the [2023.12 version of the
+  standard](https://data-apis.org/array-api/latest/changelog.html#v2023-12).
+  This includes
+  - Wrappers for `cumulative_sum()`.
+  - Wrappers for `unstack()`.
+  - Update floating-point type promotion in `sum()`, `prod()`, and `trace()`
+    to be inline with the 2023.12 specification (32-bit types no longer
+    promote to 64-bit when `dtype=None`).
+  - Add the [inspection
+    APIs](https://data-apis.org/array-api/latest/API_specification/inspection.html)
+    to the wrapped namespaces. These can be accessed with
+    `xp.__array_namespace_info__()`.
+  - Various fixes to the `clip()` wrappers.
+
+- `torch.conj` now wrapps `torch.conj_physical`, which makes a copy rather
+  than setting the conjugation bit, as arrays with the conjugation bit set do
+  not support some APIs.
+
+- `torch.sign` is now wrapped to support complex numbers and propogate nans
+  properly.
+
+### Minor Changes
+
+- Support for JAX 0.4.32 and newer which implements the array API directly in
+  `jax.numpy`.
+
+- `hypot`, `minimum`, and `maximum` (new in 2023.12) are wrapped in PyTorch to
+  support proper scalar type promotion.
+
 ## 1.8 (2024-07-24)
 
 ### Major Changes
diff --git a/numpy-1-21-xfails.txt b/numpy-1-21-xfails.txt
index d6a2c251..459b33e3 100644
--- a/numpy-1-21-xfails.txt
+++ b/numpy-1-21-xfails.txt
@@ -256,3 +256,5 @@ array_api_tests/test_searching_functions.py::test_searchsorted
 array_api_tests/test_signatures.py::test_func_signature[from_dlpack]
 array_api_tests/test_signatures.py::test_func_signature[astype]
 array_api_tests/test_signatures.py::test_array_method_signature[__dlpack__]
+# uint64 repeats not supported
+array_api_tests/test_manipulation_functions.py::test_repeat
diff --git a/numpy-1-26-xfails.txt b/numpy-1-26-xfails.txt
index 30b5d302..57b80e7e 100644
--- a/numpy-1-26-xfails.txt
+++ b/numpy-1-26-xfails.txt
@@ -51,3 +51,5 @@ array_api_tests/test_searching_functions.py::test_searchsorted
 array_api_tests/test_signatures.py::test_func_signature[from_dlpack]
 array_api_tests/test_signatures.py::test_func_signature[astype]
 array_api_tests/test_signatures.py::test_array_method_signature[__dlpack__]
+# uint64 repeats not supported
+array_api_tests/test_manipulation_functions.py::test_repeat
diff --git a/numpy-dev-xfails.txt b/numpy-dev-xfails.txt
index 68f954d2..23a83e1e 100644
--- a/numpy-dev-xfails.txt
+++ b/numpy-dev-xfails.txt
@@ -23,3 +23,5 @@ array_api_tests/test_signatures.py::test_extension_func_signature[linalg.vecdot]
 array_api_tests/test_signatures.py::test_func_signature[astype]
 array_api_tests/test_signatures.py::test_func_signature[from_dlpack]
 array_api_tests/test_signatures.py::test_array_method_signature[__dlpack__]
+# uint64 repeats not supported
+array_api_tests/test_manipulation_functions.py::test_repeat
diff --git a/numpy-xfails.txt b/numpy-xfails.txt
index cdcd2576..1c9d98f6 100644
--- a/numpy-xfails.txt
+++ b/numpy-xfails.txt
@@ -43,3 +43,5 @@ array_api_tests/test_searching_functions.py::test_searchsorted
 array_api_tests/test_signatures.py::test_func_signature[from_dlpack]
 array_api_tests/test_signatures.py::test_func_signature[astype]
 array_api_tests/test_signatures.py::test_array_method_signature[__dlpack__]
+# uint64 repeats not supported
+array_api_tests/test_manipulation_functions.py::test_repeat
diff --git a/test_cupy.sh b/test_cupy.sh
index 1655597e..2e176aa1 100755
--- a/test_cupy.sh
+++ b/test_cupy.sh
@@ -26,4 +26,5 @@ mkdir -p $SCRIPT_DIR/.hypothesis
 ln -s $SCRIPT_DIR/.hypothesis .hypothesis
 
 export ARRAY_API_TESTS_MODULE=array_api_compat.cupy
+export ARRAY_API_TESTS_VERSION=2023.12
 pytest array_api_tests/ ${PYTEST_ARGS} --xfails-file $SCRIPT_DIR/cupy-xfails.txt "$@"