diff --git a/CHANGELOG.md b/CHANGELOG.md
index f336471..cab7fde 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog for oda_reader
 
+## 1.5.1 (2026-04-15)
+- Adds support for Deflate64-compressed ZIP files in bulk downloads. The OECD switched the full CRS bulk file to Deflate64 compression, which Python's standard library does not support. This release patches `zipfile` at runtime using the `inflate64` library to handle Deflate64 transparently.
+- Adds `inflate64` as a dependency.
+
 ## 1.5.0 (2026-04-09)
 - Replaces blind version-decrement fallback with authoritative SDMX metadata endpoint lookup for all datasets.
 - Adds `clear_version_cache()` to the public API for forcing fresh version discovery mid-session.
diff --git a/pyproject.toml b/pyproject.toml
index 101b82d..cac7b43 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "oda_reader"
-version = "1.5.0"
+version = "1.5.1"
 description = "A simple package to import ODA data from the OECD's API and AidData's database"
 readme = "README.md"
 license = "MIT"
@@ -32,6 +32,7 @@ dependencies = [
     "pyarrow>=14.0.0",
     "requests>=2.33.0",
     "requests-cache>=1.2.0",
+    "inflate64>=1.0.0",
 ]
 
 
@@ -42,7 +43,7 @@ build-backend = "uv_build"
 [dependency-groups]
 dev = [
     "pre-commit>=4.0.0",
-    "pytest>=9.0.2",
+    "pytest>=9.0.3",
     "pytest-mock>=3.15.1",
     "ruff>=0.14.0",
 ]
@@ -52,7 +53,7 @@ docs = [
     "mkdocstrings[python]>=0.24.0",
 ]
 test = [
-    "pytest>=8.0",
+    "pytest>=9.0.3",
     "pytest-mock>=3.12",
     "pytest-cov>=4.1",
     "pytest-xdist>=3.5",
diff --git a/src/oda_reader/download/_deflate64.py b/src/oda_reader/download/_deflate64.py
new file mode 100644
index 0000000..33021bb
--- /dev/null
+++ b/src/oda_reader/download/_deflate64.py
@@ -0,0 +1,53 @@
+"""Patch Python's zipfile module to support Deflate64 (type 9) decompression.
+
+The OECD occasionally serves bulk download ZIP files compressed with Deflate64,
+which Python's stdlib ``zipfile`` does not support. This module patches
+``zipfile._get_decompressor`` and ``zipfile._check_compression`` to handle
+Deflate64 using the ``inflate64`` library.
+
+Only *decompression* is patched — we never need to *write* Deflate64 archives.
+
+Import this module for the side-effect::
+
+    import oda_reader.download._deflate64  # noqa: F401
+"""
+
+import zipfile
+
+import inflate64
+
+_DEFLATE64 = 9
+_original_check = zipfile._check_compression
+_original_decompressor = zipfile._get_decompressor
+
+
+class _Deflate64Decompressor:
+    """Adapter that wraps ``inflate64.Inflater`` to match the interface
+    expected by ``zipfile.ZipExtFile``: a ``decompress(data)`` method
+    and an ``eof`` attribute."""
+
+    def __init__(self):
+        self._inflater = inflate64.Inflater()
+
+    def decompress(self, data):
+        return self._inflater.inflate(data)
+
+    @property
+    def eof(self):
+        return self._inflater.eof
+
+
+def _check_compression_with_deflate64(compression):
+    if compression == _DEFLATE64:
+        return
+    return _original_check(compression)
+
+
+def _get_decompressor_with_deflate64(compress_type):
+    if compress_type == _DEFLATE64:
+        return _Deflate64Decompressor()
+    return _original_decompressor(compress_type)
+
+
+zipfile._check_compression = _check_compression_with_deflate64
+zipfile._get_decompressor = _get_decompressor_with_deflate64
diff --git a/src/oda_reader/download/download_tools.py b/src/oda_reader/download/download_tools.py
index f93e0c8..c6cd7e0 100644
--- a/src/oda_reader/download/download_tools.py
+++ b/src/oda_reader/download/download_tools.py
@@ -10,6 +10,8 @@
 import zipfile
 from pathlib import Path
 
+import oda_reader.download._deflate64  # noqa: F401 — adds Deflate64 support
+
 import pandas as pd
 import pyarrow.parquet as pq
 import requests
diff --git a/tests/download/unit/test_deflate64.py b/tests/download/unit/test_deflate64.py
new file mode 100644
index 0000000..1450bae
--- /dev/null
+++ b/tests/download/unit/test_deflate64.py
@@ -0,0 +1,191 @@
+"""Tests for Deflate64 (compression type 9) support.
+
+The OECD occasionally serves bulk download ZIP files compressed with Deflate64,
+which Python's stdlib ``zipfile`` does not support out of the box. Our
+``_deflate64`` module patches ``zipfile`` to handle this transparently.
+"""
+
+import binascii
+import io
+import struct
+import zipfile
+
+import inflate64
+import pandas as pd
+import pytest
+
+import oda_reader.download._deflate64  # noqa: F401 — ensure patch is active
+from oda_reader.download.download_tools import _save_or_return_parquet_files_from_content
+
+
+def _create_deflate64_zip(files: dict[str, bytes]) -> bytes:
+    """Create a ZIP archive using Deflate64 (type 9) compression.
+
+    Manually constructs the ZIP binary format since Python's ``zipfile``
+    cannot *write* Deflate64 — only our patch enables *reading* it.
+    """
+    buf = io.BytesIO()
+    central_dir_entries = []
+
+    for filename, data in files.items():
+        d = inflate64.Deflater()
+        compressed = d.deflate(data)
+        compressed += d.flush()
+
+        local_header_offset = buf.tell()
+        crc = binascii.crc32(data) & 0xFFFFFFFF
+        fname_bytes = filename.encode("utf-8")
+
+        # Local file header
+        buf.write(b"PK\x03\x04")
+        buf.write(struct.pack("<H", 20))  # version needed
+        buf.write(struct.pack("<H", 0))  # flags
+        buf.write(struct.pack("<H", 9))  # compression: Deflate64
+        buf.write(struct.pack("<H", 0))  # mod time
+        buf.write(struct.pack("<H", 0))  # mod date
+        buf.write(struct.pack("<I", crc))
+        buf.write(struct.pack("<I", len(compressed)))
+        buf.write(struct.pack("<I", len(data)))
+        buf.write(struct.pack("<H", len(fname_bytes)))
+        buf.write(struct.pack("<H", 0))  # extra field length
+        buf.write(fname_bytes)
+        buf.write(compressed)
+
+        central_dir_entries.append(
+            (fname_bytes, crc, len(compressed), len(data), local_header_offset)
+        )
+
+    cd_offset = buf.tell()
+    for fname_bytes, crc, comp_size, uncomp_size, offset in central_dir_entries:
+        buf.write(b"PK\x01\x02")
+        buf.write(struct.pack("<H", 20))  # version made by
+        buf.write(struct.pack("<H", 20))  # version needed
+        buf.write(struct.pack("<H", 0))  # flags
+        buf.write(struct.pack("<H", 9))  # compression: Deflate64
+        buf.write(struct.pack("<H", 0))  # mod time
+        buf.write(struct.pack("<H", 0))  # mod date
+        buf.write(struct.pack("<I", crc))
+        buf.write(struct.pack("<I", comp_size))
+        buf.write(struct.pack("<I", uncomp_size))
+        buf.write(struct.pack("<H", len(fname_bytes)))
+        buf.write(struct.pack("<H", 0))  # extra field length
+        buf.write(struct.pack("<H", 0))  # comment length
+        buf.write(struct.pack("<H", 0))  # disk number start
+        buf.write(struct.pack("<H", 0))  # internal attrs
+        buf.write(struct.pack("<I", 0))  # external attrs
+        buf.write(struct.pack("<I", offset))
+        buf.write(fname_bytes)
+
+    cd_size = buf.tell() - cd_offset
+    buf.write(b"PK\x05\x06")
+    buf.write(struct.pack("<H", 0))  # disk number
+    buf.write(struct.pack("<H", 0))  # disk with cd
+    buf.write(struct.pack("<H", len(central_dir_entries)))
+    buf.write(struct.pack("<H", len(central_dir_entries)))
+    buf.write(struct.pack("<I", cd_size))
+    buf.write(struct.pack("<I", cd_offset))
+    buf.write(struct.pack("<H", 0))  # comment length
+
+    return buf.getvalue()
+
+
+@pytest.mark.unit
+class TestDeflate64Patch:
+    """Verify the zipfile monkey-patch works correctly."""
+
+    def test_deflate64_is_recognised(self):
+        """Deflate64 (type 9) should not raise after the patch is imported."""
+        zipfile._check_compression(9)
+
+    def test_standard_types_still_work(self):
+        """STORED, DEFLATED, BZIP2, LZMA must remain functional."""
+        for compress_type in (0, 8, 12, 14):
+            zipfile._check_compression(compress_type)
+
+    def test_roundtrip_bytes(self):
+        """Compress with inflate64, wrap in a ZIP, read back via zipfile."""
+        original = b"hello world " * 200
+        zip_bytes = _create_deflate64_zip({"data.bin": original})
+
+        with zipfile.ZipFile(io.BytesIO(zip_bytes)) as z:
+            assert z.infolist()[0].compress_type == 9
+            with z.open("data.bin") as f:
+                assert f.read() == original
+
+
+@pytest.mark.unit
+class TestDeflate64FileTypeDetection:
+    """Test that _save_or_return_parquet_files_from_content handles Deflate64 ZIPs."""
+
+    def _parquet_bytes(self) -> bytes:
+        """Create sample parquet data."""
+        df = pd.DataFrame({"col1": [1, 2, 3], "col2": ["a", "b", "c"]})
+        buf = io.BytesIO()
+        df.to_parquet(buf)
+        return buf.getvalue()
+
+    def test_read_deflate64_parquet(self):
+        """Parquet inside a Deflate64 ZIP should be read correctly."""
+        zip_bytes = _create_deflate64_zip({"data.parquet": self._parquet_bytes()})
+
+        result = _save_or_return_parquet_files_from_content(zip_bytes)
+
+        assert result is not None
+        assert len(result) == 1
+        assert isinstance(result[0], pd.DataFrame)
+        assert list(result[0].columns) == ["col1", "col2"]
+        assert len(result[0]) == 3
+
+    def test_save_deflate64_parquet_to_path(self, tmp_path):
+        """Parquet inside a Deflate64 ZIP should save to disk correctly."""
+        zip_bytes = _create_deflate64_zip({"data.parquet": self._parquet_bytes()})
+
+        result = _save_or_return_parquet_files_from_content(
+            zip_bytes, save_to_path=tmp_path
+        )
+
+        assert result is None
+        saved = list(tmp_path.glob("*.parquet"))
+        assert len(saved) == 1
+        df = pd.read_parquet(saved[0])
+        assert len(df) == 3
+
+    def test_read_deflate64_csv(self):
+        """CSV inside a Deflate64 ZIP should be read correctly."""
+        csv_data = b"col1,col2,col3\n1,2,3\n4,5,6\n"
+        zip_bytes = _create_deflate64_zip({"data.csv": csv_data})
+
+        result = _save_or_return_parquet_files_from_content(zip_bytes)
+
+        assert result is not None
+        assert len(result) == 1
+        df = result[0]
+        assert list(df.columns) == ["col1", "col2", "col3"]
+        assert len(df) == 2
+
+    def test_save_deflate64_csv_as_parquet(self, tmp_path):
+        """CSV inside a Deflate64 ZIP should convert to parquet when saving."""
+        csv_data = b"col1|col2|col3\n1|2|3\n4|5|6\n"
+        zip_bytes = _create_deflate64_zip({"data.csv": csv_data})
+
+        result = _save_or_return_parquet_files_from_content(
+            zip_bytes, save_to_path=tmp_path
+        )
+
+        assert result is None
+        saved = list(tmp_path.glob("*.parquet"))
+        assert len(saved) == 1
+        df = pd.read_parquet(saved[0])
+        assert len(df) == 2
+        assert list(df.columns) == ["col1", "col2", "col3"]
+
+    def test_read_deflate64_txt(self):
+        """TXT inside a Deflate64 ZIP should be read correctly."""
+        txt_data = b"col1,col2\na,1\nb,2\n"
+        zip_bytes = _create_deflate64_zip({"data.txt": txt_data})
+
+        result = _save_or_return_parquet_files_from_content(zip_bytes)
+
+        assert result is not None
+        assert len(result) == 1
+        assert len(result[0]) == 2
diff --git a/uv.lock b/uv.lock
index f5532db..0fb0f6c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -382,6 +382,74 @@ wheels = [
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 ]
 
+[[package]]
+name = "inflate64"
+version = "1.0.4"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/3e/f3/41bb2901543abe7aad0b0b0284ae5854bb75f848cf406bf8a046bf525f67/inflate64-1.0.4.tar.gz", hash = "sha256:b398c686960c029777afc0ed281a86f66adb956cfc3fbf6667cc6453f7b407ce", size = 902542, upload-time = "2025-11-28T10:55:52.641Z" }
+wheels = [
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+    { url = "https://files.pythonhosted.org/packages/33/57/4d740b677cda81ec6f47c05b502ed15103c8a7d9c3e91ee93352d46fe69c/inflate64-1.0.4-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:8600478542e2354d1ee7b5c57c957006cabacd8b787b4046951f487a2216e5c0", size = 35856, upload-time = "2025-11-28T10:54:22.629Z" },
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