diff --git a/causalpy/__init__.py b/causalpy/__init__.py
index 8e89bb40..3372c926 100644
--- a/causalpy/__init__.py
+++ b/causalpy/__init__.py
@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/custom_exceptions.py b/causalpy/custom_exceptions.py
index 54c9b95c..39348329 100644
--- a/causalpy/custom_exceptions.py
+++ b/causalpy/custom_exceptions.py
@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/data/__init__.py b/causalpy/data/__init__.py
index e06f3de8..c8637de5 100644
--- a/causalpy/data/__init__.py
+++ b/causalpy/data/__init__.py
@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/data/datasets.py b/causalpy/data/datasets.py
index 3cb69d4b..eba7dbdb 100644
--- a/causalpy/data/datasets.py
+++ b/causalpy/data/datasets.py
@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/data/simulate_data.py b/causalpy/data/simulate_data.py
index fe3af1d3..984181e0 100644
--- a/causalpy/data/simulate_data.py
+++ b/causalpy/data/simulate_data.py
@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/experiments/__init__.py b/causalpy/experiments/__init__.py
index d1a2295a..cefd9aef 100644
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+++ b/causalpy/experiments/__init__.py
@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/experiments/base.py b/causalpy/experiments/base.py
index 8e634fad..d6cf164b 100644
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+++ b/causalpy/experiments/base.py
@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/experiments/diff_in_diff.py b/causalpy/experiments/diff_in_diff.py
index daae8e50..1c46c365 100644
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@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/experiments/instrumental_variable.py b/causalpy/experiments/instrumental_variable.py
index bb0adfc7..62d150d3 100644
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@@ -1,4 +1,4 @@
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/experiments/inverse_propensity_weighting.py b/causalpy/experiments/inverse_propensity_weighting.py
index 13f74767..cdd51521 100644
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diff --git a/causalpy/experiments/prepostfit.py b/causalpy/experiments/prepostfit.py
index 720d001a..a9aa0130 100644
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diff --git a/causalpy/experiments/prepostnegd.py b/causalpy/experiments/prepostnegd.py
index 9cecc49b..fdc902d8 100644
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diff --git a/causalpy/experiments/regression_discontinuity.py b/causalpy/experiments/regression_discontinuity.py
index 75b3184b..07f009ea 100644
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diff --git a/causalpy/experiments/regression_kink.py b/causalpy/experiments/regression_kink.py
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diff --git a/causalpy/plot_utils.py b/causalpy/plot_utils.py
index df1c0376..15d5c004 100644
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diff --git a/causalpy/pymc_experiments.py b/causalpy/pymc_experiments.py
index 15960072..f15fee11 100644
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+++ b/causalpy/pymc_experiments.py
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/pymc_models.py b/causalpy/pymc_models.py
index 032da928..4a88de95 100644
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diff --git a/causalpy/skl_experiments.py b/causalpy/skl_experiments.py
index d3d6b5f8..a6aa9b34 100644
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diff --git a/causalpy/skl_models.py b/causalpy/skl_models.py
index f4fe2437..05402f20 100644
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diff --git a/causalpy/tests/__init__.py b/causalpy/tests/__init__.py
index d1a2295a..cefd9aef 100644
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diff --git a/causalpy/tests/conftest.py b/causalpy/tests/conftest.py
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diff --git a/causalpy/tests/test_api_stability.py b/causalpy/tests/test_api_stability.py
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diff --git a/causalpy/tests/test_data_loading.py b/causalpy/tests/test_data_loading.py
index 1fbc3b1f..f506299b 100644
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diff --git a/causalpy/tests/test_input_validation.py b/causalpy/tests/test_input_validation.py
index 4f19a9d1..8cde6453 100644
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/tests/test_integration_pymc_examples.py b/causalpy/tests/test_integration_pymc_examples.py
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diff --git a/causalpy/tests/test_integration_skl_examples.py b/causalpy/tests/test_integration_skl_examples.py
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+#   Copyright 2025 The PyMC Labs Developers
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diff --git a/causalpy/tests/test_misc.py b/causalpy/tests/test_misc.py
index de3192be..8f1f5508 100644
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diff --git a/causalpy/tests/test_model_experiment_compatability.py b/causalpy/tests/test_model_experiment_compatability.py
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diff --git a/causalpy/tests/test_synthetic_data.py b/causalpy/tests/test_synthetic_data.py
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diff --git a/causalpy/tests/test_utils.py b/causalpy/tests/test_utils.py
index e67f391e..48deecc8 100644
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diff --git a/causalpy/utils.py b/causalpy/utils.py
index bc29c5ca..d4e53a56 100644
--- a/causalpy/utils.py
+++ b/causalpy/utils.py
@@ -1,4 +1,4 @@
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diff --git a/causalpy/version.py b/causalpy/version.py
index a48782f2..5235dba0 100644
--- a/causalpy/version.py
+++ b/causalpy/version.py
@@ -1,4 +1,4 @@
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