diff --git a/.ci/requirements-cibw.txt b/.ci/requirements-cibw.txt
index 0e314b8bf..520b6e320 100644
--- a/.ci/requirements-cibw.txt
+++ b/.ci/requirements-cibw.txt
@@ -1 +1 @@
-cibuildwheel==2.23.3
+cibuildwheel==3.0.0
diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
index 6b76351b0..6d8acc44f 100644
--- a/.github/workflows/test-windows.yml
+++ b/.github/workflows/test-windows.yml
@@ -35,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["pypy3.11", "pypy3.10", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["pypy3.11", "pypy3.10", "3.10", "3.11", "3.12", ">=3.13.5", "3.14"]
         architecture: ["x64"]
         include:
             # Test the oldest Python on 32-bit
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 006d574f3..b4b516228 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -43,6 +43,7 @@ jobs:
         python-version: [
           "pypy3.11",
           "pypy3.10",
+          "3.14t",
           "3.14",
           "3.13t",
           "3.13",
@@ -55,6 +56,7 @@ jobs:
         - { python-version: "3.11", PYTHONOPTIMIZE: 1, REVERSE: "--reverse" }
         - { python-version: "3.10", PYTHONOPTIMIZE: 2 }
         # Free-threaded
+        - { python-version: "3.14t", disable-gil: true }
         - { python-version: "3.13t", disable-gil: true }
         # M1 only available for 3.10+
         - { os: "macos-13", python-version: "3.9" }
diff --git a/.github/workflows/wheels-dependencies.sh b/.github/workflows/wheels-dependencies.sh
index b46811f5a..996d32bc2 100755
--- a/.github/workflows/wheels-dependencies.sh
+++ b/.github/workflows/wheels-dependencies.sh
@@ -39,7 +39,7 @@ ARCHIVE_SDIR=pillow-depends-main
 # Package versions for fresh source builds
 FREETYPE_VERSION=2.13.3
 HARFBUZZ_VERSION=11.2.1
-LIBPNG_VERSION=1.6.48
+LIBPNG_VERSION=1.6.49
 JPEGTURBO_VERSION=3.1.1
 OPENJPEG_VERSION=2.5.3
 XZ_VERSION=5.8.1
diff --git a/.github/workflows/wheels-test.ps1 b/.github/workflows/wheels-test.ps1
index a1edc14ef..54e7fbbfc 100644
--- a/.github/workflows/wheels-test.ps1
+++ b/.github/workflows/wheels-test.ps1
@@ -9,17 +9,21 @@ if ("$venv" -like "*\cibw-run-*\pp*-win_amd64\*") {
     C:\vc_redist.x64.exe /install /quiet /norestart | Out-Null
 }
 $env:path += ";$pillow\winbuild\build\bin\"
-& "$venv\Scripts\activate.ps1"
+if (Test-Path $venv\Scripts\pypy.exe) {
+  $python = "pypy.exe"
+} else {
+  $python = "python.exe"
+}
 & reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\python.exe" /v "GlobalFlag" /t REG_SZ /d "0x02000000" /f
 if ("$venv" -like "*\cibw-run-*-win_amd64\*") {
-  & python -m pip install numpy
+  & $venv\Scripts\$python -m pip install numpy
 }
 cd $pillow
-& python -VV
+& $venv\Scripts\$python -VV
 if (!$?) { exit $LASTEXITCODE }
-& python selftest.py
+& $venv\Scripts\$python selftest.py
 if (!$?) { exit $LASTEXITCODE }
-& python -m pytest -vx Tests\check_wheel.py
+& $venv\Scripts\$python -m pytest -vx Tests\check_wheel.py
 if (!$?) { exit $LASTEXITCODE }
-& python -m pytest -vx Tests
+& $venv\Scripts\$python -m pytest -vx Tests
 if (!$?) { exit $LASTEXITCODE }
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 33e1976f0..72516651f 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -110,7 +110,6 @@ jobs:
           CIBW_MANYLINUX_PYPY_AARCH64_IMAGE: ${{ matrix.manylinux }}
           CIBW_MANYLINUX_PYPY_X86_64_IMAGE: ${{ matrix.manylinux }}
           CIBW_MANYLINUX_X86_64_IMAGE: ${{ matrix.manylinux }}
-          CIBW_SKIP: pp39-*
           MACOSX_DEPLOYMENT_TARGET: ${{ matrix.macosx_deployment_target }}
 
       - uses: actions/upload-artifact@v4
@@ -188,7 +187,6 @@ jobs:
           CIBW_BEFORE_ALL: "{package}\\winbuild\\build\\build_dep_all.cmd"
           CIBW_CACHE_PATH: "C:\\cibw"
           CIBW_ENABLE: cpython-prerelease cpython-freethreading pypy
-          CIBW_SKIP: pp39-*
           CIBW_TEST_SKIP: "*-win_arm64"
           CIBW_TEST_COMMAND: 'docker run --rm
             -v {project}:C:\pillow
diff --git a/Tests/images/p_4_planes.pcx b/Tests/images/p_4_planes.pcx
new file mode 100644
index 000000000..8c5743a98
Binary files /dev/null and b/Tests/images/p_4_planes.pcx differ
diff --git a/Tests/test_file_pcx.py b/Tests/test_file_pcx.py
index 5d7fd1c1b..2e999eff6 100644
--- a/Tests/test_file_pcx.py
+++ b/Tests/test_file_pcx.py
@@ -37,6 +37,11 @@ def test_sanity(tmp_path: Path) -> None:
         im.save(f)
 
 
+def test_p_4_planes() -> None:
+    with Image.open("Tests/images/p_4_planes.pcx") as im:
+        assert im.getpixel((0, 0)) == 3
+
+
 def test_bad_image_size() -> None:
     with open("Tests/images/pil184.pcx", "rb") as fp:
         data = fp.read()
diff --git a/docs/installation/platform-support.rst b/docs/installation/platform-support.rst
index 57a2298f8..a56f94316 100644
--- a/docs/installation/platform-support.rst
+++ b/docs/installation/platform-support.rst
@@ -40,12 +40,12 @@ These platforms are built and tested for every change.
 | macOS 13 Ventura                 | 3.9                        | x86-64              |
 +----------------------------------+----------------------------+---------------------+
 | macOS 14 Sonoma                  | 3.10, 3.11, 3.12, 3.13,    | arm64               |
-|                                  | PyPy3                      |                     |
+|                                  | 3.14, PyPy3                |                     |
 +----------------------------------+----------------------------+---------------------+
 | Ubuntu Linux 22.04 LTS (Jammy)   | 3.10                       | x86-64              |
 +----------------------------------+----------------------------+---------------------+
 | Ubuntu Linux 24.04 LTS (Noble)   | 3.9, 3.10, 3.11,           | x86-64              |
-|                                  | 3.12, 3.13, PyPy3          |                     |
+|                                  | 3.12, 3.13, 3.14, PyPy3    |                     |
 |                                  +----------------------------+---------------------+
 |                                  | 3.12                       | arm64v8, ppc64le,   |
 |                                  |                            | s390x               |
@@ -53,7 +53,7 @@ These platforms are built and tested for every change.
 | Windows Server 2022              | 3.9                        | x86                 |
 |                                  +----------------------------+---------------------+
 |                                  | 3.10, 3.11, 3.12, 3.13,    | x86-64              |
-|                                  | PyPy3                      |                     |
+|                                  | 3.14, PyPy3                |                     |
 |                                  +----------------------------+---------------------+
 |                                  | 3.12 (MinGW)               | x86-64              |
 |                                  +----------------------------+---------------------+
diff --git a/docs/releasenotes/11.3.0.rst b/docs/releasenotes/11.3.0.rst
new file mode 100644
index 000000000..b0595def9
--- /dev/null
+++ b/docs/releasenotes/11.3.0.rst
@@ -0,0 +1,56 @@
+11.3.0
+------
+
+Security
+========
+
+TODO
+^^^^
+
+TODO
+
+:cve:`YYYY-XXXXX`: TODO
+^^^^^^^^^^^^^^^^^^^^^^^
+
+TODO
+
+Backwards incompatible changes
+==============================
+
+TODO
+^^^^
+
+Deprecations
+============
+
+TODO
+^^^^
+
+TODO
+
+API changes
+===========
+
+TODO
+^^^^
+
+TODO
+
+API additions
+=============
+
+TODO
+^^^^
+
+TODO
+
+Other changes
+=============
+
+Python 3.14 beta
+^^^^^^^^^^^^^^^^
+
+To help other projects prepare for Python 3.14, wheels are now built for the
+3.14 beta as a preview. This is not official support for Python 3.14, but rather
+an opportunity for you to test how Pillow works with the beta and report any
+problems.
diff --git a/docs/releasenotes/index.rst b/docs/releasenotes/index.rst
index 5d7b21d59..a85f1e075 100644
--- a/docs/releasenotes/index.rst
+++ b/docs/releasenotes/index.rst
@@ -14,6 +14,7 @@ expected to be backported to earlier versions.
 .. toctree::
   :maxdepth: 2
 
+  11.3.0
   11.2.1
   11.1.0
   11.0.0
diff --git a/src/libImaging/PcxDecode.c b/src/libImaging/PcxDecode.c
index 942c8dc22..a65952fb1 100644
--- a/src/libImaging/PcxDecode.c
+++ b/src/libImaging/PcxDecode.c
@@ -60,15 +60,25 @@ ImagingPcxDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t byt
         }
 
         if (state->x >= state->bytes) {
-            if (state->bytes % state->xsize && state->bytes > state->xsize) {
-                int bands = state->bytes / state->xsize;
-                int stride = state->bytes / bands;
+            int bands;
+            int xsize = 0;
+            int stride = 0;
+            if (state->bits == 2 || state->bits == 4) {
+                xsize = (state->xsize + 7) / 8;
+                bands = state->bits;
+                stride = state->bytes / state->bits;
+            } else {
+                xsize = state->xsize;
+                bands = state->bytes / state->xsize;
+                if (bands != 0) {
+                    stride = state->bytes / bands;
+                }
+            }
+            if (stride > xsize) {
                 int i;
                 for (i = 1; i < bands; i++) {  // note -- skipping first band
                     memmove(
-                        &state->buffer[i * state->xsize],
-                        &state->buffer[i * stride],
-                        state->xsize
+                        &state->buffer[i * xsize], &state->buffer[i * stride], xsize
                     );
                 }
             }
diff --git a/tox.ini b/tox.ini
index 4065245ee..967d4b537 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ requires =
     tox>=4.2
 env_list =
     lint
-    py{py3, 313, 312, 311, 310, 39}
+    py{py3, 314, 313, 312, 311, 310, 39}
 
 [testenv]
 deps =
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index 0cc383733..098716b60 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -118,7 +118,7 @@ V = {
     "LCMS2": "2.17",
     "LIBAVIF": "1.3.0",
     "LIBIMAGEQUANT": "4.3.4",
-    "LIBPNG": "1.6.48",
+    "LIBPNG": "1.6.49",
     "LIBWEBP": "1.5.0",
     "OPENJPEG": "2.5.3",
     "TIFF": "4.7.0",