diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 70f67d2..19d44af 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -20,13 +20,13 @@ jobs:
     name: Build wheels on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     env:
-      CIBW_ARCHS_MACOS: "x86_64 universal2 arm64"
+      CIBW_ARCHS_MACOS: "x86_64 arm64"
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-latest, macos-10.15]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         cibw_archs: ["auto"]
         include:
-          - os: ubuntu-20.04
+          - os: ubuntu-latest
             cibw_archs : "aarch64"
 
     steps:
@@ -36,57 +36,55 @@ jobs:
         with:
           platforms: arm64
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v5
         name: Install Python
         with:
-          python-version: '3.7'
-
-      - name: Install cibuildwheel
-        run: |
-          python -m pip install cibuildwheel==2.3.0
+          python-version: '3.x'
       - name: Build wheels
-        run: |
-          python -m cibuildwheel --output-dir wheelhouse
-      - uses: actions/upload-artifact@v2
+        uses: pypa/cibuildwheel@v2.18.0
+      - uses: actions/upload-artifact@v4
         with:
+          name: cibw-wheels-${{ matrix.os }}-${{ strategy.job-index }}
           path: ./wheelhouse/*.whl
 
   build_sdist:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v5
         name: Install Python
         with:
-          python-version: '3.7'
+          python-version: '3.x'
 
       - name: Build sdist
-        run: |
-            python -m pip install cython numpy setuptools_scm
-            python setup.py sdist
-
-      - uses: actions/upload-artifact@v2
+        run: pipx run build --sdist
+      - uses: actions/upload-artifact@v4
         with:
+          name: cibw-sdist
           path: dist/*.tar.gz
 
   upload_pypi:
     needs: [build_wheels, build_sdist]
     runs-on: ubuntu-latest
-    # upload to PyPI on every tag starting with 'v'
-    # if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/v')
-    # alternatively, to publish when a GitHub Release is created, use the following rule:
+    environment: pypi
+      # upload to PyPI on every tag starting with 'v'
+      # if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/v')
+      # alternatively, to publish when a GitHub Release is created, use the following rule:
     if: github.event_name == 'release' && github.event.action == 'published'
     steps:
-      - uses: actions/download-artifact@v2
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
         with:
-          name: artifact
+          # unpacks all CIBW artifacts into dist/
+          pattern: cibw-*
           path: dist
-
-      - uses: pypa/gh-action-pypi-publish@master
+          merge-multiple: true
+      - name: Upload release to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
         with:
           user: __token__
           password: ${{ secrets.pypitoken }}
diff --git a/cpnest/NestedSampling.py b/cpnest/NestedSampling.py
index c6a3f5a..b9b0f23 100644
--- a/cpnest/NestedSampling.py
+++ b/cpnest/NestedSampling.py
@@ -371,8 +371,8 @@ def get_worst_n_live_points(self, n):
         for evolution
         """
         self.worst = np.arange(n)
-        self.logLmin.value = np.float128(self.params[n-1].logL)
-        return np.float128(self.logLmin.value)
+        self.logLmin.value = np.float(self.params[n-1].logL)
+        return self.logLmin.value
 
     def check_insertion_indices(self, rolling=True, filename=None):
         """
diff --git a/pyproject.toml b/pyproject.toml
index 9a5d7d5..58bc354 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,2 +1,6 @@
 [build-system]
 requires = ["setuptools_scm", "numpy", "cython"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools_scm]
+
diff --git a/setup.py b/setup.py
index 0e130c5..17f570e 100644
--- a/setup.py
+++ b/setup.py
@@ -59,13 +59,12 @@
             'Development Status :: 4 - Beta',
             'License :: OSI Approved :: MIT License',
             'Programming Language :: Python :: 3',
-            'Programming Language :: Python :: 3.2',
-            'Programming Language :: Python :: 3.3',
-            'Programming Language :: Python :: 3.4',
-            'Programming Language :: Python :: 3.5',
-            'Programming Language :: Python :: 3.6',
-            'Programming Language :: Python :: 3.7',
-            'Programming Language :: Python :: 3.8'],
+            'Programming Language :: Python :: 3.12',
+            'Programming Language :: Python :: 3.11',
+            'Programming Language :: Python :: 3.10',
+            'Programming Language :: Python :: 3.9',
+            'Programming Language :: Python :: 3.8',
+            'Programming Language :: Python :: 3.7'],
         keywords='nested sampling bayesian inference',
         packages=['cpnest'],
         install_requires=requirements,