diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ec279fb..b6edc07 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -61,7 +61,7 @@ jobs:
           - "3.15"
           - "3.15t"
           - "pypy-3.11"
-          - "pypy-3.11"
+          - "pypy-3.12"
         os: ["ubuntu-latest"]
         include:
           - os: "macos-latest"  # For m1 macos
@@ -302,10 +302,6 @@ jobs:
             PYTHON_ZLIB_NG_BUILD_CACHE=True
             PYTHON_ZLIB_NG_BUILD_CACHE_FILE=${{ runner.temp }}/build_cache
             CFLAGS="-O3 -DNDEBUG"
-      - name: Build sdist
-        if: ${{runner.os == 'Linux' && matrix.cibw_archs_linux == 'x86_64'}}
-        run:
-            python -m build --sdist
       - uses: actions/upload-artifact@v7
         with:
           name: "cibw-${{ runner.os }}-${{ runner.arch }}-${{ matrix.cibw_archs_linux }}"
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 0bf5722..94f1052 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -9,6 +9,8 @@ Changelog
 
 version 1.0.1-dev
 -----------------
++ Python 3.10 and PyPy 3.10 are no longer supported. Added support for PyPy
+  3.12 and Python 3.15.
 + Update included zlib-ng distribution to 2.3.3.
 + Fix BrokenPipeError when piping ``python -m isal.igzip`` into ``head``,
   ``less`` or similar programs.
diff --git a/pyproject.toml b/pyproject.toml
index 531017a..65409e9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,11 +15,11 @@ requires-python = ">=3.9"  # Because of setuptools version
 classifiers = [
         "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: 3.14",
+        "Programming Language :: Python :: 3.15",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Programming Language :: C",
diff --git a/src/zlib_ng/zlib_ngmodule.c b/src/zlib_ng/zlib_ngmodule.c
index 59233e5..d2b5e79 100644
--- a/src/zlib_ng/zlib_ngmodule.c
+++ b/src/zlib_ng/zlib_ngmodule.c
@@ -1183,8 +1183,10 @@ decompress_buf(ZlibDecompressor *self, Py_ssize_t max_length)
 
     self->avail_in_real += self->zst.avail_in;
 
-    if (_PyBytes_Resize(&return_value, self->zst.next_out -
-                        (uint8_t *)PyBytes_AS_STRING(return_value)) != 0) {
+    /* Prevent empty string object from being resized. */
+    if (PyBytes_GET_SIZE(return_value) != 0 &&
+        _PyBytes_Resize(&return_value, self->zst.next_out -
+            (uint8_t *)PyBytes_AS_STRING(return_value)) != 0) {
         goto error;
     }