@@ -178,7 +178,7 @@ jobs:
 
   test-docs:
     needs: [ruff, mypy, sdist]
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 15
     steps:
       - uses: libsdl-org/setup-sdl@1894460666e4fe0c6603ea0cce5733f1cca56ba1
@@ -201,6 +201,7 @@ jobs:
         run: pip install -e .
         env:
           TDL_BUILD: DEBUG
+          CFLAGS: "-D_POSIX_C_SOURCE=2"
       - name: Test doc generation
         working-directory: docs
         run: python -m sphinx -T -E -W --keep-going . _build/html
@@ -296,7 +297,7 @@ jobs:
 
   build-macos:
     needs: [ruff, mypy, sdist]
-    runs-on: "macos-14"
+    runs-on: "macos-26"
     timeout-minutes: 15
     strategy:
       fail-fast: true
@@ -329,6 +330,7 @@ jobs:
           CIBW_TEST_COMMAND: python -c "import tcod.context"
           CIBW_TEST_SKIP: "pp* *-macosx_arm64 *-macosx_universal2:arm64"
           MACOSX_DEPLOYMENT_TARGET: "10.13"
+          CFLAGS: "-D_POSIX_C_SOURCE=202405L"
       - name: Remove asterisk from label
         env:
           PYTHON_DESC: ${{ matrix.python }}