diff --git a/.github/workflows/build_arm.yml b/.github/workflows/build_arm.yml
index 54ee5b4..1a4d3e6 100644
--- a/.github/workflows/build_arm.yml
+++ b/.github/workflows/build_arm.yml
@@ -30,10 +30,11 @@ jobs:
       - name: Get submodules
         run: git submodule update --init --recursive
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.23.3
+        uses: pypa/cibuildwheel@v4.2.1
         env:
           CIBW_ARCHS: ${{ matrix.cibw_archs }}
           CIBW_SKIP: "pp*"
+          CIBW_ENABLE: "pypy pypy-eol"
       - uses: actions/upload-artifact@v4.6.2
         with:
           name: wheels
diff --git a/.github/workflows/build_publish.yml b/.github/workflows/build_publish.yml
index 4c5419c..1d844a6 100644
--- a/.github/workflows/build_publish.yml
+++ b/.github/workflows/build_publish.yml
@@ -19,7 +19,7 @@ jobs:
         name: Install Python
 
       - name: Install cibuildwheel
-        run: python -m pip install cibuildwheel==2.23.3
+        run: python -m pip install cibuildwheel==4.2.1
       
       - name: Get submodules
         run: git submodule update --init --recursive
@@ -30,13 +30,15 @@ jobs:
           python -m cibuildwheel --output-dir wheels
         env:
            CIBW_SKIP: "cp27-* pp27-*"  # skip Python 2.7 wheels
+           CIBW_ENABLE: "pypy pypy-eol"
       
       - name: Build wheels for mac and manylinux
         if: "!startsWith(matrix.os, 'windows')"
         run: |
           python -m cibuildwheel --output-dir wheels
         env:
-           CIBW_ARCHS_MACOS: "auto x86_64 universal2 arm64"
+           CIBW_ARCHS_MACOS: "auto auto32 x86_64 universal2 arm64"
+           CIBW_ENABLE: "pypy pypy-eol"
 
       - uses: actions/upload-artifact@v4.6.2
         name: Upload wheels
diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index 12f5bac..236dbbc 100644
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -17,7 +17,7 @@ jobs:
         name: Install Python
 
       - name: Install cibuildwheel
-        run: python -m pip install cibuildwheel==2.23.3
+        run: python -m pip install cibuildwheel==4.2.1
       
       - name: Get submodules
         run: git submodule update --init --recursive
@@ -28,10 +28,12 @@ jobs:
           python -m cibuildwheel --output-dir wheels
         env:
            CIBW_SKIP: "cp27-* pp27-*"  # skip Python 2.7 wheels
+           CIBW_ENABLE: "pypy pypy-eol"
       
       - name: Build wheels for mac and manylinux
         if: "!startsWith(matrix.os, 'windows')"
         run: |
           python -m cibuildwheel --output-dir wheels
         env:
-           CIBW_ARCHS_MACOS: "auto x86_64 universal2 arm64"
+           CIBW_ARCHS_MACOS: "auto auto32 x86_64 universal2 arm64"
+           CIBW_ENABLE: "pypy pypy-eol"
diff --git a/setup.py b/setup.py
index f1f6632..d2833a9 100644
--- a/setup.py
+++ b/setup.py
@@ -182,6 +182,9 @@ def run(self):
     building_for_openbsd = 'openbsd' in self.plat_name # need testing
 
     if building_for_linux:
+      # glibc/musl only declare memmem() when _GNU_SOURCE is set; GCC 14
+      # treats the missing prototype as an error.
+      module.define_macros.append(('_GNU_SOURCE', '1'))
       module.define_macros.append(('USE_LINUX_PROC', '1'))
     elif building_for_windows:
       module.define_macros.append(('USE_WINDOWS_PROC', '1'))