diff --git a/.github/workflows/ci-sage.yml b/.github/workflows/ci-sage.yml
index 8aee2c8e..42e11342 100644
--- a/.github/workflows/ci-sage.yml
+++ b/.github/workflows/ci-sage.yml
@@ -59,10 +59,9 @@ env:
   TARGETS_PRE: build/make/Makefile
   TARGETS:     SAGE_CHECK=no SAGE_CHECK_PACKAGES="cysignals,cypari" cysignals cypari
   TARGETS_OPTIONAL: build/make/Makefile
-  # Standard setting: Test the current beta release of Sage:
-  # Temporarily test with https://github.com/sagemath/sage/pull/36110
+  # Standard setting: Test the current beta release of Sage
   SAGE_REPO:   sagemath/sage
-  SAGE_REF:    refs/pull/36110/merge
+  SAGE_REF:    develop
   REMOVE_PATCHES: "*"
 
 jobs:
@@ -106,29 +105,24 @@ jobs:
       with:
           submodules: recursive
           fetch-depth: 0
-    - name: install cygwin and minimal prerequisites with choco
+    - name: Install cygwin and minimal prerequisites with choco
       shell: bash {0}
       run: |
         choco --version
         choco install make autoconf gcc-core gcc-g++ python3${{ matrix.python-version }}-devel --source cygwin
-    - name: install dependencies
-      run: |
-        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && python3.${{ matrix.python-version }} -m pip install -U --no-build-isolation -r requirements.txt'
-    - name: install
+    - name: Install dependencies
       run: |
-        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && python3.${{ matrix.python-version }} setup.py build_ext -i'
-    - name: test
+        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && python3.${{ matrix.python-version }} -m pip install --upgrade pip'
+    - name: Build and check
       run: |
-        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && make install PYTHON=python3.${{ matrix.python-version }}'
-        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && make check-all PYTHON=python3.${{ matrix.python-version }}'
-        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && make distcheck PYTHON=python3.${{ matrix.python-version }}'
+        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && make check PYTHON=python3.${{ matrix.python-version }}'
 
   ubuntu-without-sage:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12-dev']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
     steps:
     - name: Set up the repository
       uses: actions/checkout@v4
@@ -142,15 +136,9 @@ jobs:
     - name: Install dependencies
       run: |
           python -m pip install --upgrade pip
-          pip install -U --no-build-isolation -r requirements.txt
-    - name: Freeze pip
+    - name: Build and check
       run: |
-          pip freeze
-    - name: Local build
-      run: |
-        make -j4 install
-        make -j4 check-all
-        make -j4 distcheck
+        make -j4 check
 
   linux:
     uses: sagemath/sage/.github/workflows/docker.yml@develop
@@ -210,15 +198,9 @@ jobs:
     - name: Install dependencies
       run: |
           python -m pip install --upgrade pip
-          pip install -U --no-build-isolation -r requirements.txt
-    - name: Freeze pip
-      run: |
-          pip freeze
-    - name: Local build
+    - name: Build and check
       run: |
-        make -j4 install
-        make -j4 check-all
-        make -j4 distcheck
+        make -j4 check
 
   macos:
     uses: sagemath/sage/.github/workflows/macos.yml@develop
diff --git a/Makefile b/Makefile
index fa8dc522..f515cb81 100644
--- a/Makefile
+++ b/Makefile
@@ -16,10 +16,11 @@ DOCTEST = $(PYTHON) -B rundoctests.py
 all: build doc
 
 build: configure
-	$(PYTHON) setup.py build
+	$(PIP) install build
+	$(PYTHON) -m build
 
 install: configure
-	$(PIP) install --no-build-isolation --no-index --ignore-installed --no-deps .
+	$(PIP) install .
 
 dist: configure
 	$(PIP) install build
@@ -56,9 +57,9 @@ distclean: clean
 
 test: check
 
-check: check-tmp
+check: check-all
 
-check-all: check-tmp
+check-all:
 	$(MAKE) check-install
 
 # Install and check
@@ -68,73 +69,13 @@ check-doctest: install
 	$(DOCTEST) src/cysignals/*.pyx
 
 check-example: install
-	cd example && $(PYTHON) setup.py clean build
+	$(PYTHON) -m pip install -U build setuptools Cython
+	cd example && $(PYTHON) -m build --no-isolation .
 
 check-gdb: install
 	$(PYTHON) testgdb.py
 
 
-#####################
-# Check installation
-#####################
-#
-# Test 2 installation scenarios without a real installation
-# - prefix (with --prefix and --root)
-# - user (with --user)
-
-check-tmp:
-	$(MAKE) check-prefix
-	$(MAKE) check-user
-
-prefix-install: configure
-	rm -rf tmp/local tmp/build tmp/site-packages
-	$(PYTHON) setup.py install --prefix="`pwd`/tmp/local" --root=tmp/build
-	cd tmp && mv "build/`pwd`/local" local
-	cd tmp && cp -R local/lib*/python*/site-packages site-packages
-
-check-prefix: check-prefix-doctest check-prefix-example
-
-check-prefix-doctest: prefix-install
-	export PYTHONPATH="`pwd`/tmp/site-packages" && $(DOCTEST) src/cysignals/*.pyx
-
-check-prefix-example: prefix-install
-	rm -rf example/build
-	export PYTHONPATH="`pwd`/tmp/site-packages" && cd example && $(PYTHON) setup.py clean build
-
-check-user: check-user-doctest check-user-example
-
-user-install: configure
-	rm -rf tmp/user
-	export PYTHONUSERBASE="`pwd`/tmp/user" && $(PYTHON) setup.py install --user --old-and-unmanageable
-
-check-user-doctest: user-install
-	export PYTHONUSERBASE="`pwd`/tmp/user" && $(DOCTEST) src/cysignals/*.pyx
-
-check-user-example: user-install
-	export PYTHONUSERBASE="`pwd`/tmp/user" && cd example && $(PYTHON) setup.py clean build
-
-distcheck: dist
-	rm -rf dist/check
-	mkdir -p dist/check
-	cd dist/check && tar xzf ../cysignals-$(VERSION).tar.gz
-	cd dist/check/cysignals-$(VERSION) && $(LS_R) >../dist0.ls
-	cd dist/check/cysignals-$(VERSION) && $(MAKE) all
-	cd dist/check/cysignals-$(VERSION) && $(MAKE) distclean
-	cd dist/check/cysignals-$(VERSION) && $(LS_R) >../dist1.ls
-	cd dist/check; diff -u dist0.ls dist1.ls || { echo >&2 "Error: distclean after all leaves garbage"; exit 1; }
-	cd dist/check/cysignals-$(VERSION) && $(MAKE) check-user
-	cd dist/check/cysignals-$(VERSION) && ./configure --enable-debug
-	cd dist/check/cysignals-$(VERSION) && $(MAKE) check-prefix
-	cd dist/check/cysignals-$(VERSION) && $(MAKE) distclean
-	cd dist/check/cysignals-$(VERSION) && $(LS_R) >../dist2.ls
-	cd dist/check; diff -u dist0.ls dist2.ls || { echo >&2 "Error: distclean after check-tmp leaves garbage"; exit 1; }
-	cd dist/check/cysignals-$(VERSION) && $(MAKE) dist
-	cd dist/check/cysignals-$(VERSION) && tar xzf dist/cysignals-$(VERSION).tar.gz
-	cd dist/check/cysignals-$(VERSION)/cysignals-$(VERSION) && $(LS_R) >../../dist3.ls
-	cd dist/check; diff -u dist0.ls dist3.ls || { echo >&2 "Error: sdist is not reproducible"; exit 1; }
-	rm -rf dist/check
-
-
 #####################
 # Maintain
 #####################
@@ -145,7 +86,5 @@ configure: configure.ac
 	@rm -f src/config.h.in~
 
 .PHONY: all build doc install dist doc clean clean-build clean-doc \
-	distclean test check check-all check-tmp check-install \
-	check-doctest check-example \
-	check-prefix prefix-install check-prefix-doctest check-prefix-example \
-	check-user user-install check-user-doctest check-user-example
+	distclean test check check-all check-install \
+	check-doctest check-example
diff --git a/example/pyproject.toml b/example/pyproject.toml
new file mode 100644
index 00000000..5d7cd719
--- /dev/null
+++ b/example/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ['setuptools', 'Cython>=0.28', 'cysignals']
+build-backend = "setuptools.build_meta"
diff --git a/example/setup.py b/example/setup.py
index c8be0016..9b53c8a8 100755
--- a/example/setup.py
+++ b/example/setup.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 from setuptools import setup
+from setuptools.extension import Extension
 from distutils.command.build import build as _build
 
 
@@ -21,7 +22,6 @@ def cythonize(self, extensions):
     name="cysignals_example",
     version='1.0',
     license='Public Domain',
-    setup_requires=["cysignals"],
-    ext_modules=["cysignals_example.pyx"],
+    ext_modules=[Extension("*", ["cysignals_example.pyx"])],
     cmdclass=dict(build=build),
 )