diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index e88b317..5010933 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -1,3 +1,6 @@
+# Copyright (C) 2023 Roberto Rossini (roberros@uio.no)
+# SPDX-License-Identifier: MIT
+
 name: Wheels
 
 on:
diff --git a/pyproject.toml b/pyproject.toml
index c2c6979..d6151c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,9 +34,9 @@ filterwarnings = [
 ]
 
 [tool.cibuildwheel]
-test-command = "python -m pytest {project}/test"
+test-command = "pytest {project}/test"
 test-extras = ["test"]
-test-skip = ["*universal2:arm64"]
+test-skip = ["*universal2:arm64", "pp*"]
 
 # Setuptools bug causes collision between pypy and cpython artifacts
 before-all = [
diff --git a/test/test_fetch.py b/test/test_fetch.py
index d2b7f5b..c035e0c 100644
--- a/test/test_fetch.py
+++ b/test/test_fetch.py
@@ -1,3 +1,7 @@
+# Copyright (C) 2023 Roberto Rossini <roberros@uio.no>
+#
+# SPDX-License-Identifier: MIT
+
 import os
 
 import numpy as np
diff --git a/test/test_fetch_accessors.py b/test/test_fetch_accessors.py
index e72ace4..cd6777d 100644
--- a/test/test_fetch_accessors.py
+++ b/test/test_fetch_accessors.py
@@ -1,3 +1,7 @@
+# Copyright (C) 2023 Roberto Rossini <roberros@uio.no>
+#
+# SPDX-License-Identifier: MIT
+
 import os
 
 import pytest
diff --git a/test/test_fetch_dense.py b/test/test_fetch_dense.py
index 13132dd..2f73ed4 100644
--- a/test/test_fetch_dense.py
+++ b/test/test_fetch_dense.py
@@ -1,3 +1,7 @@
+# Copyright (C) 2023 Roberto Rossini <roberros@uio.no>
+#
+# SPDX-License-Identifier: MIT
+
 import os
 
 import numpy as np
diff --git a/test/test_fetch_nnz.py b/test/test_fetch_nnz.py
index ee4ca20..b28767a 100644
--- a/test/test_fetch_nnz.py
+++ b/test/test_fetch_nnz.py
@@ -1,3 +1,7 @@
+# Copyright (C) 2023 Roberto Rossini <roberros@uio.no>
+#
+# SPDX-License-Identifier: MIT
+
 import os
 
 import pytest
diff --git a/test/test_fetch_sparse.py b/test/test_fetch_sparse.py
index ca2347c..15dca2a 100644
--- a/test/test_fetch_sparse.py
+++ b/test/test_fetch_sparse.py
@@ -1,3 +1,7 @@
+# Copyright (C) 2023 Roberto Rossini <roberros@uio.no>
+#
+# SPDX-License-Identifier: MIT
+
 import os
 
 import numpy as np
diff --git a/test/test_fetch_sum.py b/test/test_fetch_sum.py
index 5c29e9c..724e1a6 100644
--- a/test/test_fetch_sum.py
+++ b/test/test_fetch_sum.py
@@ -1,3 +1,7 @@
+# Copyright (C) 2023 Roberto Rossini <roberros@uio.no>
+#
+# SPDX-License-Identifier: MIT
+
 import os
 
 import pytest