diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 25eca8d..c4dd87c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -144,38 +144,6 @@ jobs:
         name: dist
         path: dist
 
-  postfix:
-    name: Fix up wheels
-    needs: [build_sdist, build_macos, build_windows, build_linux ]
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: recursive
-
-    - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: "3.x"
-
-    - uses: actions/download-artifact@v2
-      with:
-        name: dist
-        path: dist
-
-    # https://github.com/PyO3/maturin/issues/829
-    - name: Add license text file to wheels
-      run: |
-        pip install -r requirements.txt
-        python add_license_file_to_wheels.py dist/*.whl
-
-    - name: Upload wheels
-      uses: actions/upload-artifact@v2
-      with:
-        name: dist
-        path: dist
-
   release:
     name: Release on tags
     if: startsWith(github.ref, 'refs/tags/v')
diff --git a/add_license_file_to_wheels.py b/add_license_file_to_wheels.py
deleted file mode 100755
index 852f31b..0000000
--- a/add_license_file_to_wheels.py
+++ /dev/null
@@ -1,26 +0,0 @@
-#!/usr/bin/env python3
-
-import sys
-from pathlib import Path
-import shutil
-from wheeltools import InWheel
-
-
-root_dir = Path(__file__).parent.resolve()
-crate_dir = root_dir / "pngquant"
-license = crate_dir / "COPYRIGHT"
-
-
-def main():
-    # maturin has problems adding the license text to the wheel archive yet so we
-    # have to do it ourselves: cf. https://github.com/PyO3/maturin/issues/829
-    for wheel_file in sys.argv[1:]:
-        print(f"Adding '{license.name}' to '{wheel_file}'")
-        with InWheel(in_wheel=wheel_file, out_wheel=wheel_file) as tmpdir:
-            distinfo = next(Path(tmpdir).glob("*.dist-info"))
-            assert distinfo.is_dir()
-            shutil.copyfile(license, distinfo / "LICENSE")
-
-
-if __name__ == "__main__":
-    sys.exit(main())
diff --git a/pyproject.toml b/pyproject.toml
index 7868487..8ab8979 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["maturin>=0.12,<0.13"]
+requires = ["maturin>=0.12.10,<0.13"]
 build-backend = "maturin"
 
 [tool.maturin]
@@ -13,9 +13,10 @@ bindings = "bin"
 [project]
 name = "pngquant-cli"
 # by default, use the same 'version' as Cargo.toml, but can override if needed
-version = "2.17.0.post5"
+version = "2.17.0.post6"
 description = "Precompiled binaries for pngquant, the lossy PNG compressor based on libimagequant."
 maintainers = [{name = "Cosimo Lupo", email = "cosimo@anthrotype.com"}]
+license = {file = "COPYRIGHT"}
 
 [project.urls]
 repository = "https://github.com/anthrotype/pngquant-wheels"
diff --git a/requirements.txt b/requirements.txt
index 9b77ee3..0423f19 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
-maturin
+maturin>=0.12.10,<0.13
 tomli
 tomli-w
 twine
-wheeltools