diff --git a/.github/workflows/buildwheels.yml b/.github/workflows/buildwheels.yml
index 48374c9..acccde6 100644
--- a/.github/workflows/buildwheels.yml
+++ b/.github/workflows/buildwheels.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, macos-11]
+        os: [ubuntu-20.04, macos-12, macos-latest]
 
     steps:
       - uses: actions/checkout@v3
@@ -28,7 +28,7 @@ jobs:
           platforms: all
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.12.0
+        uses: pypa/cibuildwheel@v2.17.0
 
       - uses: actions/upload-artifact@v3
         with:
diff --git a/bbi/__init__.py b/bbi/__init__.py
index 778d2ab..d737ce7 100644
--- a/bbi/__init__.py
+++ b/bbi/__init__.py
@@ -16,4 +16,16 @@
 
 del cbbi, _bbi
 
-__version__ = '0.3.6'
+__version__ = '0.4.0'
+__all__ = [
+    'is_bbi',
+    'is_bigwig',
+    'is_bigbed',
+    'open',
+    'info',
+    'chromsizes',
+    'zooms',
+    'fetch_intervals',
+    'fetch',
+    'stackup',
+]
diff --git a/pyproject.toml b/pyproject.toml
index ad0585b..8275ff0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ include = ["bbi*"]
 
 [project]
 name = "pybbi"
-description = "Python bindings to the UCSC Big Binary (bigWig/bigBed) file library."
+description = "Python bindings to the UCSC source for Big Binary Indexed (bigWig/bigBed) files."
 requires-python = ">=3.7"
 license = {text = "MIT"}
 authors = [
@@ -44,6 +44,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
 ]
 
 dependencies = [
@@ -69,7 +70,7 @@ repository = "https://github.com/nvictus/pybbi"
 
 
 [tool.cibuildwheel]
-build = ["cp38-*", "cp39-*", "cp310-*", "cp311-*"]
+build = ["cp39-*", "cp310-*", "cp311-*", "cp312-*"]
 skip = "*-musllinux*"
 build-verbosity = 3
 
@@ -79,7 +80,7 @@ before-all = "yum install -y gcc make zlib-devel openssl-devel libpng-devel"
 
 
 [tool.cibuildwheel.macos]
-archs = ["x86_64"]  # "arm64" is not yet supported by GitHub Actions (Needs M1 runner)
+archs = ["x86_64", "arm64"]  # "arm64" needs M1 runner on GitHub Actions
 before-all = """
 brew install pkg-config openssl libpng  # -> /usr/local (x86_64)
 """