diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5fb3aee1..01cfdafb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -101,7 +101,6 @@ jobs:
           - {VERSION: "pypy-3.10", TOXENV: "pypy3"}
 
           # MSRV
-          - {VERSION: "3.12", TOXENV: "py312", RUST_VERSION: "1.63.0"}
           - {VERSION: "3.12", TOXENV: "py312", RUST_VERSION: "1.64.0"}
           - {VERSION: "3.12", TOXENV: "py312", RUST_VERSION: "beta"}
           - {VERSION: "3.12", TOXENV: "py312", RUST_VERSION: "nightly"}
@@ -129,8 +128,6 @@ jobs:
           toolchain: ${{ matrix.PYTHON.RUST_VERSION || 'stable' }}
 
       - run: pip install tox
-      - if: matrix.PYTHON.RUST_VERSION == '1.63.0'
-        run: echo 'BCRYPT_ALLOW_RUST_163=1' >> $GITHUB_ENV
       - run: tox
         env:
           TOXENV: ${{ matrix.PYTHON.TOXENV }}
diff --git a/pyproject.toml b/pyproject.toml
index 095e9cf8..9fc9980d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,9 +1,8 @@
 [build-system]
-# Must be kept in sync with `setup_requirements` in `setup.py`
 requires = [
     "setuptools>=42.0.0",
     "wheel",
-    "setuptools-rust",
+    "setuptools-rust>=1.7.0",
 ]
 # Point to the setuptools' PEP517 build backend explicitly to
 # disable Pip's fallback guessing
@@ -50,6 +49,11 @@ readme = {file = "README.rst", content-type = "text/x-rst"}
 tests = ["pytest>=3.2.1,!=3.3.0"]
 typecheck = ["mypy"]
 
+[[tool.setuptools-rust.ext-modules]]
+target = "bcrypt._bcrypt"
+path = "src/_bcrypt/Cargo.toml"
+py-limited-api = "auto"
+rust-version = ">=1.64.0"
 
 [tool.ruff]
 line-length = 79
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 13694c48..00000000
--- a/setup.py
+++ /dev/null
@@ -1,101 +0,0 @@
-import os
-import platform
-import re
-import shutil
-import subprocess
-import sys
-
-from setuptools import setup
-
-try:
-    from setuptools_rust import RustExtension
-except ImportError:
-    print(
-        """
-        =============================DEBUG ASSISTANCE==========================
-        If you are seeing an error here please try the following to
-        successfully install bcrypt:
-
-        Upgrade to the latest pip and try again. This will fix errors for most
-        users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
-        =============================DEBUG ASSISTANCE==========================
-        """
-    )
-    raise
-
-if platform.python_implementation() == "PyPy":
-    if sys.pypy_version_info < (2, 6):
-        raise RuntimeError(
-            "bcrypt is not compatible with PyPy < 2.6. Please upgrade PyPy to "
-            "use this library."
-        )
-
-
-try:
-    setup(
-        rust_extensions=[
-            RustExtension(
-                "bcrypt._bcrypt",
-                "src/_bcrypt/Cargo.toml",
-                py_limited_api="auto",
-                rust_version=(
-                    ">=1.64.0"
-                    if os.environ.get("BCRYPT_ALLOW_RUST_163", "0") != "0"
-                    else ">=1.63.0"
-                ),
-            ),
-        ],
-    )
-except:
-    # Note: This is a bare exception that re-raises so that we don't interfere
-    # with anything the installation machinery might want to do. Because we
-    # print this for any exception this msg can appear (e.g. in verbose logs)
-    # even if there's no failure. For example, SetupRequirementsError is raised
-    # during PEP517 building and prints this text. setuptools raises SystemExit
-    # when compilation fails right now, but it's possible this isn't stable
-    # or a public API commitment so we'll remain ultra conservative.
-
-    import pkg_resources
-
-    print(
-        """
-    =============================DEBUG ASSISTANCE=============================
-    If you are seeing a compilation error please try the following steps to
-    successfully install bcrypt:
-    1) Upgrade to the latest pip and try again. This will fix errors for most
-       users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
-    2) Ensure you have a recent Rust toolchain installed. bcrypt requires
-       rustc >= 1.64.0. (1.63 may be used by setting the BCRYPT_ALLOW_RUST_163
-       environment variable)
-    """
-    )
-    print(f"    Python: {'.'.join(str(v) for v in sys.version_info[:3])}")
-    print(f"    platform: {platform.platform()}")
-    for dist in ["pip", "setuptools", "setuptools_rust"]:
-        try:
-            version = pkg_resources.get_distribution(dist).version
-        except pkg_resources.DistributionNotFound:
-            version = "n/a"
-        print(f"    {dist}: {version}")
-    version = "n/a"
-    if shutil.which("rustc") is not None:
-        try:
-            # If for any reason `rustc --version` fails, silently ignore it
-            rustc_output = subprocess.run(
-                ["rustc", "--version"],
-                capture_output=True,
-                timeout=0.5,
-                encoding="utf8",
-                check=True,
-            ).stdout
-            version = re.sub("^rustc ", "", rustc_output.strip())
-        except subprocess.SubprocessError:
-            pass
-    print(f"    rustc: {version}")
-
-    print(
-        """\
-    =============================DEBUG ASSISTANCE=============================
-    """
-    )
-    raise
diff --git a/tox.ini b/tox.ini
index ec13ebb8..dfe3e5bb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,7 +35,7 @@ deps =
     readme_renderer
 commands =
     check-manifest
-    python setup.py check --metadata --restructuredtext --strict
+    python3 -m readme_renderer README.rst -o /dev/null
 
 
 [check-manifest]