diff --git a/pixi.lock b/pixi.lock
index 36a67a04..16dba96f 100644
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-      osx-arm64:
+      p1:
       - conda: https://conda.anaconda.org/conda-forge/noarch/_python_abi3_support-1.0-hd8ed1ab_2.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/annotated-types-0.7.0-pyhd8ed1ab_1.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/anyio-4.13.0-pyhcf101f3_0.conda
@@ -2358,8 +2371,7 @@ environments:
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       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/zstd-1.5.7-hbf9d68e_6.conda
-      - pypi: .
-      - pypi: git+https://github.com/easyscience/corelib.git?rev=bayesian_extend#8c83ab3cb6f7e598f16f31c70cc3935f326bf2ca
+      - pypi: ./
       - pypi: https://files.pythonhosted.org/packages/00/bb/90ba423612b6aa0adccc6b1874bcd4a9b44b660c0c16f346611e00f64ac3/backrefs-7.0-py313-none-any.whl
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+      - pypi: https://files.pythonhosted.org/packages/e6/90/90a65e6ae1b6e66183b48874d32509fc306c994beecc7924a6fa3d9f8955/easyscience-2.5.1-py3-none-any.whl
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@@ -2659,8 +2672,7 @@ environments:
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       - conda: https://conda.anaconda.org/conda-forge/win-64/zeromq-4.3.5-h507cc87_10.conda
       - conda: https://conda.anaconda.org/conda-forge/win-64/zstd-1.5.7-h534d264_6.conda
-      - pypi: .
-      - pypi: git+https://github.com/easyscience/corelib.git?rev=bayesian_extend#8c83ab3cb6f7e598f16f31c70cc3935f326bf2ca
+      - pypi: ./
       - pypi: https://files.pythonhosted.org/packages/00/bb/90ba423612b6aa0adccc6b1874bcd4a9b44b660c0c16f346611e00f64ac3/backrefs-7.0-py313-none-any.whl
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+      - pypi: https://files.pythonhosted.org/packages/e6/90/90a65e6ae1b6e66183b48874d32509fc306c994beecc7924a6fa3d9f8955/easyscience-2.5.1-py3-none-any.whl
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-      osx-arm64:
+      p1:
       - conda: https://conda.anaconda.org/conda-forge/noarch/_python_abi3_support-1.0-hd8ed1ab_2.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/annotated-types-0.7.0-pyhd8ed1ab_1.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/anyio-4.13.0-pyhcf101f3_0.conda
@@ -8297,11 +8310,11 @@ packages:
   purls: []
   size: 388453
   timestamp: 1764777142545
-- pypi: .
+- pypi: ./
   name: easyreflectometry
   requires_dist:
   - bumps
-  - easyscience @ git+https://github.com/easyscience/corelib.git@bayesian_extend
+  - easyscience
   - orsopy
   - plotly
   - pooch
@@ -8345,55 +8358,6 @@ packages:
   - validate-pyproject[all] ; extra == 'dev'
   - versioningit ; extra == 'dev'
   requires_python: '>=3.11'
-- pypi: git+https://github.com/easyscience/corelib.git?rev=bayesian_extend#8c83ab3cb6f7e598f16f31c70cc3935f326bf2ca
-  name: easyscience
-  version: 2.4.0+dev17
-  requires_dist:
-  - asteval
-  - bumps
-  - dfo-ls
-  - lmfit
-  - numpy
-  - scipp
-  - build ; extra == 'dev'
-  - copier ; extra == 'dev'
-  - docstripy ; extra == 'dev'
-  - format-docstring ; extra == 'dev'
-  - gitpython ; extra == 'dev'
-  - interrogate ; extra == 'dev'
-  - ipykernel ; extra == 'dev'
-  - ipympl ; extra == 'dev'
-  - ipython ; extra == 'dev'
-  - ipywidgets ; extra == 'dev'
-  - jinja2 ; extra == 'dev'
-  - jupyterlab ; extra == 'dev'
-  - jupyterquiz ; extra == 'dev'
-  - jupytext ; extra == 'dev'
-  - matplotlib ; extra == 'dev'
-  - mike ; extra == 'dev'
-  - mkdocs ; extra == 'dev'
-  - mkdocs-autorefs ; extra == 'dev'
-  - mkdocs-jupyter ; extra == 'dev'
-  - mkdocs-markdownextradata-plugin ; extra == 'dev'
-  - mkdocs-material ; extra == 'dev'
-  - mkdocs-plugin-inline-svg ; extra == 'dev'
-  - mkdocstrings-python ; extra == 'dev'
-  - nbmake ; extra == 'dev'
-  - nbqa ; extra == 'dev'
-  - nbstripout ; extra == 'dev'
-  - pooch ; extra == 'dev'
-  - pre-commit ; extra == 'dev'
-  - pydoclint ; extra == 'dev'
-  - pytest ; extra == 'dev'
-  - pytest-cov ; extra == 'dev'
-  - pytest-xdist ; extra == 'dev'
-  - pyyaml ; extra == 'dev'
-  - radon ; extra == 'dev'
-  - ruff ; extra == 'dev'
-  - spdx-headers ; extra == 'dev'
-  - validate-pyproject[all] ; extra == 'dev'
-  - versioningit ; extra == 'dev'
-  requires_python: '>=3.11'
 - pypi: https://files.pythonhosted.org/packages/00/bb/90ba423612b6aa0adccc6b1874bcd4a9b44b660c0c16f346611e00f64ac3/backrefs-7.0-py313-none-any.whl
   name: backrefs
   version: '7.0'
@@ -13173,6 +13137,56 @@ packages:
   - nodejs ; extra == 'all'
   - pythreejs ; extra == 'all'
   requires_python: '>=3.11'
+- pypi: https://files.pythonhosted.org/packages/e6/90/90a65e6ae1b6e66183b48874d32509fc306c994beecc7924a6fa3d9f8955/easyscience-2.5.1-py3-none-any.whl
+  name: easyscience
+  version: 2.5.1
+  sha256: e44c3efb10f8e040ba88523c6ba58e131e3174721f24801d036fdc5a24e622f2
+  requires_dist:
+  - asteval
+  - bumps>=1.0.4
+  - dfo-ls
+  - lmfit
+  - numpy
+  - scipp
+  - build ; extra == 'dev'
+  - copier ; extra == 'dev'
+  - docstripy ; extra == 'dev'
+  - format-docstring ; extra == 'dev'
+  - gitpython ; extra == 'dev'
+  - interrogate ; extra == 'dev'
+  - ipykernel ; extra == 'dev'
+  - ipympl ; extra == 'dev'
+  - ipython ; extra == 'dev'
+  - ipywidgets ; extra == 'dev'
+  - jinja2 ; extra == 'dev'
+  - jupyterlab ; extra == 'dev'
+  - jupyterquiz ; extra == 'dev'
+  - jupytext ; extra == 'dev'
+  - matplotlib ; extra == 'dev'
+  - mike ; extra == 'dev'
+  - mkdocs ; extra == 'dev'
+  - mkdocs-autorefs ; extra == 'dev'
+  - mkdocs-jupyter ; extra == 'dev'
+  - mkdocs-markdownextradata-plugin ; extra == 'dev'
+  - mkdocs-material ; extra == 'dev'
+  - mkdocs-plugin-inline-svg ; extra == 'dev'
+  - mkdocstrings-python ; extra == 'dev'
+  - nbmake ; extra == 'dev'
+  - nbqa ; extra == 'dev'
+  - nbstripout ; extra == 'dev'
+  - pooch ; extra == 'dev'
+  - pre-commit ; extra == 'dev'
+  - pydoclint ; extra == 'dev'
+  - pytest ; extra == 'dev'
+  - pytest-cov ; extra == 'dev'
+  - pytest-xdist ; extra == 'dev'
+  - pyyaml ; extra == 'dev'
+  - radon ; extra == 'dev'
+  - ruff ; extra == 'dev'
+  - spdx-headers ; extra == 'dev'
+  - validate-pyproject[all] ; extra == 'dev'
+  - versioningit ; extra == 'dev'
+  requires_python: '>=3.11'
 - pypi: https://files.pythonhosted.org/packages/e7/05/c19819d5e3d95294a6f5947fb9b9629efb316b96de511b418c53d245aae6/cycler-0.12.1-py3-none-any.whl
   name: cycler
   version: 0.12.1
diff --git a/src/easyreflectometry/analysis/bayesian.py b/src/easyreflectometry/analysis/bayesian.py
index 17ab252c..b5bdfb43 100644
--- a/src/easyreflectometry/analysis/bayesian.py
+++ b/src/easyreflectometry/analysis/bayesian.py
@@ -84,7 +84,14 @@ def _to_arviz_data(draws: np.ndarray, param_names: list[str]):
     for i, name in enumerate(param_names):
         posterior_dict[name] = draws[:, :, i]
 
-    return _arviz.from_dict({'posterior': posterior_dict})
+    # arviz < 1.0 takes the posterior variables as a keyword argument; arviz
+    # >= 1.0 removed it in favour of a single {group: {var: array}} mapping.
+    # The 1.x call cannot go first: 0.x accepts the mapping without error but
+    # misreads it as one variable named 'posterior'.
+    try:
+        return _arviz.from_dict(posterior=posterior_dict)
+    except TypeError:
+        return _arviz.from_dict({'posterior': posterior_dict})
 
 
 class PosteriorResults:
diff --git a/tests/test_bayesian.py b/tests/test_bayesian.py
index 1cb78d4f..6d0c3148 100644
--- a/tests/test_bayesian.py
+++ b/tests/test_bayesian.py
@@ -565,10 +565,14 @@ def test_2d_draws_become_single_chain(self, sample_draws):
         draws, param_names = sample_draws
         idata = _to_arviz_data(draws, param_names)
         posterior = idata.posterior
+        # Dimension naming varies across arviz versions, so assert on the
+        # contract itself: every sample survives conversion with its values
+        # intact, in a single chain.
         assert posterior.sizes['chain'] == 1
-        assert posterior.sizes['draw'] == draws.shape[0]
-        for name in param_names:
-            assert name in posterior
+        for i, name in enumerate(param_names):
+            values = np.asarray(posterior[name].values).reshape(-1)
+            assert values.size == draws.shape[0]
+            assert np.allclose(values, draws[:, i])
 
 
 # ===================================================================