diff --git a/AB_environments/AB_baseline.conda.yaml b/AB_environments/AB_baseline.conda.yaml
index f0bd820acf..4909cf5aac 100644
--- a/AB_environments/AB_baseline.conda.yaml
+++ b/AB_environments/AB_baseline.conda.yaml
@@ -5,42 +5,42 @@
 channels:
   - conda-forge
 dependencies:
-  - python =3.9  # Single '=' means latest patch version available
+  - python =3.10  # Single '=' means latest patch version available
   # Copy-paste from ci/environment.yml
   - pip
   - coiled >=0.2.54
-  - numpy ==1.26.2
-  - pandas ==2.1.4
-  - dask ==2023.12.0
-  - distributed ==2023.12.0
-  - dask-expr ==0.2.8
+  - numpy ==1.26.4
+  - pandas ==2.2.2
+  - dask ==2024-07.1
+  - distributed ==2024-07.1
+  - dask-expr ==1.1.9
   - dask-labextension ==7.0.0
-  - dask-ml ==2023.3.24
-  - fsspec ==2023.12.1
-  - s3fs ==2023.12.1
-  - gcsfs ==2023.12.1
-  - pyarrow ==15.0.0
-  - jupyterlab ==4.0.9
-  - lz4 ==4.3.2
-  - ipywidgets ==8.1.1
-  - numba ==0.58.1
-  - scikit-learn ==1.3.2
+  - dask-ml ==2024.4.4
+  - fsspec ==2024.6.1
+  - s3fs ==2024.6.1
+  - gcsfs ==2024.6.1
+  - pyarrow ==17.0.0
+  - jupyterlab ==4.2.4
+  - lz4 ==4.3.3
+  - ipywidgets ==8.1.3
+  - numba ==0.60.0
+  - scikit-learn ==1.5.1
   - ipycytoscape ==1.3.3
   - click ==8.1.7
-  - xarray ==2023.12.0
-  - zarr ==2.16.1
-  - cftime ==1.6.3
-  - msgpack-python ==1.0.7
+  - xarray ==2024.07.0
+  - zarr ==2.18.2
+  - cftime ==1.6.4
+  - msgpack-python
   - cloudpickle ==3.0.0
-  - tornado ==6.3.3
-  - toolz ==0.12.0
+  - tornado ==6.4.1
+  - toolz ==0.12.1
   - zict ==3.0.0
-  - xgboost ==1.7.6
-  - optuna ==3.5.0
-  - scipy ==1.11.4
-  - sqlalchemy ==2.0.23
-  - pynvml ==11.5.0
-  - bokeh ==3.3.2
+  - xgboost ==2.1.1
+  - optuna ==3.6.1
+  - scipy ==1.14.0
+  - sqlalchemy ==2.0.31
+  - pynvml ==11.5.3
+  - bokeh ==3.5.1
   - gilknocker ==0.4.1
   - openssl >1.1.0g
   # End copy-paste
@@ -50,6 +50,6 @@ dependencies:
     # conda. You may alternatively point to your own git fork (but make sure you
     # sync'ed tags!)
     # Read README.md for troubleshooting.
-    # - git+https://github.com/dask/dask@191d39177009d2cce25b818878118e35329b6db3
-    # - git+https://github.com/dask/distributed@0304fb6e665e36abf9e3086173cccd36e29ae84d
-    # - git+https://github.com/dask-contrib/dask-expr@9f765764da3f518ddd4c896c98b8a40a979a5553
+    - git+https://github.com/dask/dask@191d39177009d2cce25b818878118e35329b6db3
+    - git+https://github.com/dask/distributed@0304fb6e665e36abf9e3086173cccd36e29ae84d
+    - git+https://github.com/dask-contrib/dask-expr@9f765764da3f518ddd4c896c98b8a40a979a5553
diff --git a/AB_environments/AB_sample.conda.yaml b/AB_environments/AB_sample.conda.yaml
index 0d885703d5..4909cf5aac 100644
--- a/AB_environments/AB_sample.conda.yaml
+++ b/AB_environments/AB_sample.conda.yaml
@@ -1,51 +1,46 @@
-# Sample conda environment file for A/B testing.
-# Change contents/delete/rename as needed.
+# Special environment file for A/B testing, used to define the conda environment for the
+# baseline environment.
+# Change contents, but do not rename.
 
-# Every A/B environment *must* present these three files:
-# - AB_<name>.conda.yaml
-# - AB_<name>.dask.yaml
-# - AB_<name>.cluster.yaml
-
-# You should always start from a copy-paste from AB_baseline.conda.yaml
 channels:
   - conda-forge
 dependencies:
-  - python =3.9  # Single '=' means latest patch version available
-  # Copy-paste from AB_baseline.conda.yaml
+  - python =3.10  # Single '=' means latest patch version available
+  # Copy-paste from ci/environment.yml
   - pip
   - coiled >=0.2.54
-  - numpy ==1.26.2
-  - pandas ==2.1.4
-  - dask ==2023.12.0
-  - distributed ==2023.12.0
-  - dask-expr ==0.2.8
+  - numpy ==1.26.4
+  - pandas ==2.2.2
+  - dask ==2024-07.1
+  - distributed ==2024-07.1
+  - dask-expr ==1.1.9
   - dask-labextension ==7.0.0
-  - dask-ml ==2023.3.24
-  - fsspec ==2023.12.1
-  - s3fs ==2023.12.1
-  - gcsfs ==2023.12.1
-  - pyarrow ==15.0.0
-  - jupyterlab ==4.0.9
-  - lz4 ==4.3.2
-  - ipywidgets ==8.1.1
-  - numba ==0.58.1
-  - scikit-learn ==1.3.2
+  - dask-ml ==2024.4.4
+  - fsspec ==2024.6.1
+  - s3fs ==2024.6.1
+  - gcsfs ==2024.6.1
+  - pyarrow ==17.0.0
+  - jupyterlab ==4.2.4
+  - lz4 ==4.3.3
+  - ipywidgets ==8.1.3
+  - numba ==0.60.0
+  - scikit-learn ==1.5.1
   - ipycytoscape ==1.3.3
   - click ==8.1.7
-  - xarray ==2023.12.0
-  - zarr ==2.16.1
-  - cftime ==1.6.3
-  - msgpack-python ==1.0.7
+  - xarray ==2024.07.0
+  - zarr ==2.18.2
+  - cftime ==1.6.4
+  - msgpack-python
   - cloudpickle ==3.0.0
-  - tornado ==6.3.3
-  - toolz ==0.12.0
+  - tornado ==6.4.1
+  - toolz ==0.12.1
   - zict ==3.0.0
-  - xgboost ==1.7.6
-  - optuna ==3.5.0
-  - scipy ==1.11.4
-  - sqlalchemy ==2.0.23
-  - pynvml ==11.5.0
-  - bokeh ==3.3.2
+  - xgboost ==2.1.1
+  - optuna ==3.6.1
+  - scipy ==1.14.0
+  - sqlalchemy ==2.0.31
+  - pynvml ==11.5.3
+  - bokeh ==3.5.1
   - gilknocker ==0.4.1
   - openssl >1.1.0g
   # End copy-paste
diff --git a/ci/environment.yml b/ci/environment.yml
index 387b2189e9..18d2cdb902 100644
--- a/ci/environment.yml
+++ b/ci/environment.yml
@@ -8,41 +8,41 @@ dependencies:
 # - AB_environments/AB_sample.conda.yaml
 ########################################################
 
-  - python >=3.9
+  - python >=3.10
   - pip
   - coiled >=0.2.54
-  - numpy ==1.26.2
-  - pandas ==2.2.1
-  - dask ==2023.12.0
-  - distributed ==2023.12.0
-  - dask-expr ==0.2.8
+  - numpy ==1.26.4
+  - pandas ==2.2.2
+  - dask ==2024-07.1
+  - distributed ==2024-07.1
+  - dask-expr ==1.1.9
   - dask-labextension ==7.0.0
-  - dask-ml ==2023.3.24
-  - fsspec ==2023.12.1
-  - s3fs ==2023.12.1
-  - gcsfs ==2023.12.1
-  - pyarrow ==15.0.0
-  - jupyterlab ==4.0.9
-  - lz4 ==4.3.2
-  - ipywidgets ==8.1.1
-  - numba ==0.58.1
-  - scikit-learn ==1.3.2
+  - dask-ml ==2024.4.4
+  - fsspec ==2024.6.1
+  - s3fs ==2024.6.1
+  - gcsfs ==2024.6.1
+  - pyarrow ==17.0.0
+  - jupyterlab ==4.2.4
+  - lz4 ==4.3.3
+  - ipywidgets ==8.1.3
+  - numba ==0.60.0
+  - scikit-learn ==1.5.1
   - ipycytoscape ==1.3.3
   - click ==8.1.7
-  - xarray ==2023.12.0
-  - zarr ==2.16.1
-  - cftime ==1.6.3
-  - msgpack-python ==1.0.7
+  - xarray ==2024.07.0
+  - zarr ==2.18.2
+  - cftime ==1.6.4
+  - msgpack-python
   - cloudpickle ==3.0.0
-  - tornado ==6.3.3
-  - toolz ==0.12.0
+  - tornado ==6.4.1
+  - toolz ==0.12.1
   - zict ==3.0.0
-  - xgboost ==1.7.6
-  - optuna ==3.5.0
-  - scipy ==1.11.4
-  - sqlalchemy ==2.0.23
-  - pynvml ==11.5.0
-  - bokeh ==3.3.2
+  - xgboost ==2.1.1
+  - optuna ==3.6.1
+  - scipy ==1.14.0
+  - sqlalchemy ==2.0.31
+  - pynvml ==11.5.3
+  - bokeh ==3.5.1
   - gilknocker ==0.4.1
   - openssl >1.1.0g