diff --git a/.github/workflows/smoke.yml b/.github/workflows/smoke.yml
index 218e36241..04f519a35 100644
--- a/.github/workflows/smoke.yml
+++ b/.github/workflows/smoke.yml
@@ -36,6 +36,7 @@ jobs:
       matrix:
         config:
           - {os: ubuntu-24.04, python: "3.12", ffmpeg: "8.0.1", extras: true}
+          - {os: ubuntu-24.04, python: "3.10", ffmpeg: "8.0.1"}
           - {os: ubuntu-24.04, python: "pypy3.11", ffmpeg: "8.0.1"}
           - {os: macos-14, python: "3.11", ffmpeg: "8.0.1"}
 
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4b4e1f45d..9cbdb6715 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,12 +16,11 @@ jobs:
           pip install -U cython setuptools
           python scripts/fetch-vendor.py --config-file scripts/ffmpeg-latest.json /tmp/vendor
           PKG_CONFIG_PATH=/tmp/vendor/lib/pkgconfig python setup.py sdist
-      - name: Publish to PyPI
-        if: github.event_name == 'release' && github.event.action == 'published'
-        uses: pypa/gh-action-pypi-publish@release/v1
+      - name: Upload source package
+        uses: actions/upload-artifact@v6
         with:
-          user: __token__
-          password: ${{ secrets.PYPI_TOKEN }}
+          name: dist-source
+          path: dist/
 
   package-wheel:
     runs-on: ${{ matrix.os }}
@@ -73,20 +72,29 @@ jobs:
           cibuildwheel --output-dir dist
         shell: bash
       - name: Upload wheels
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: dist-${{ matrix.os }}-${{ matrix.arch }}
           path: dist/
 
   publish:
     runs-on: ubuntu-latest
-    needs: [package-wheel]
+    needs: [package-source, package-wheel]
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v7
         with:
           merge-multiple: true
           path: dist/
+
+      - name: Publish to GitHub
+        if: github.event_name == 'release'
+        uses: softprops/action-gh-release@v1
+        with:
+          files: dist/*
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Publish to PyPI
         if: github.event_name == 'release' && github.event.action == 'published'
         uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/av/video/reformatter.py b/av/video/reformatter.py
index dc898be84..e3e83d2d9 100644
--- a/av/video/reformatter.py
+++ b/av/video/reformatter.py
@@ -234,8 +234,8 @@ def _reformat(
         with cython.nogil:
             lib.sws_scale(
                 self.ptr,
-                frame.ptr.data,
-                frame.ptr.linesize,
+                cython.cast("const unsigned char *const *", frame.ptr.data),
+                cython.cast("const int *", frame.ptr.linesize),
                 0,  # slice Y
                 frame.ptr.height,
                 new_frame.ptr.data,
diff --git a/include/libswscale/swscale.pxd b/include/libswscale/swscale.pxd
index 2d855d95a..ffc0eb6b0 100644
--- a/include/libswscale/swscale.pxd
+++ b/include/libswscale/swscale.pxd
@@ -1,6 +1,6 @@
+from libc.stdint cimport uint8_t
 
 cdef extern from "libswscale/swscale.h" nogil:
-
     cdef int   swscale_version()
     cdef char* swscale_configuration()
     cdef char* swscale_license()
@@ -13,7 +13,6 @@ cdef extern from "libswscale/swscale.h" nogil:
     cdef struct SwsFilter:
         pass
 
-    # Flags.
     cdef int SWS_FAST_BILINEAR
     cdef int SWS_BILINEAR
     cdef int SWS_BICUBIC
@@ -25,7 +24,6 @@ cdef extern from "libswscale/swscale.h" nogil:
     cdef int SWS_SINC
     cdef int SWS_LANCZOS
     cdef int SWS_SPLINE
-
     cdef int SWS_CS_ITU709
     cdef int SWS_CS_FCC
     cdef int SWS_CS_ITU601
@@ -36,16 +34,14 @@ cdef extern from "libswscale/swscale.h" nogil:
 
     cdef int sws_scale(
         SwsContext *ctx,
-        const unsigned char *const *src_slice,
+        const uint8_t *const *src_slice,
         const int *src_stride,
         int src_slice_y,
         int src_slice_h,
         unsigned char *const *dst_slice,
-        int *dst_stride,
+        const int *dst_stride,
     )
-
     cdef void sws_freeContext(SwsContext *ctx)
-
     cdef SwsContext *sws_getCachedContext(
         SwsContext *context,
         int src_width,
@@ -59,9 +55,7 @@ cdef extern from "libswscale/swscale.h" nogil:
         SwsFilter *dst_filter,
         double *param,
     )
-
-    cdef int* sws_getCoefficients(int colorspace)
-
+    cdef const int* sws_getCoefficients(int colorspace)
     cdef int sws_getColorspaceDetails(
         SwsContext *context,
         int **inv_table,
@@ -72,7 +66,6 @@ cdef extern from "libswscale/swscale.h" nogil:
         int *contrast,
         int *saturation
     )
-
     cdef int sws_setColorspaceDetails(
         SwsContext *context,
         const int inv_table[4],