diff --git a/environment.yml b/environment.yml
index f73f263..3e95a5f 100644
--- a/environment.yml
+++ b/environment.yml
@@ -22,7 +22,7 @@ dependencies:
   - pytest-html
   - pytest-rerunfailures
   - pytest-xdist
-  - python-lzf
+  - python-neo-lzf  # built from pypi.org/project/python-neo-lzf/
   - s3fs >=2025.9.0
   # documentation dependencies
   - autodocsumm
diff --git a/pyfive/btree.py b/pyfive/btree.py
index 2cf7ac9..aae17f6 100644
--- a/pyfive/btree.py
+++ b/pyfive/btree.py
@@ -190,7 +190,8 @@ def _filter_chunk(cls, chunk_buffer, filter_mask, filter_pipeline, itemsize):
                     import lzf
                 except ImportError as e:
                     raise ModuleNotFoundError(
-                        "LZF codec requires optional package 'python-lzf'."
+                        "LZF codec requires optional package 'python-neo-lzf'."
+                        "Could be installed from conda-forge or PyPI."
                     ) from e
                 uncompressed_len = struct.unpack(">H", chunk_buffer[:2])[0]
                 chunk_buffer = lzf.decompress(chunk_buffer, uncompressed_len)
diff --git a/pyproject.toml b/pyproject.toml
index 7268f73..d12a550 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,7 @@ test = [
     "pytest-html",
     "pytest-rerunfailures",
     "pytest-xdist",
-    "python-lzf",
+    "python-neo-lzf",  # pypi.org/project/python-neo-lzf/
     "s3fs>=2025.9.0",  # v-mismatch with boto3 results in ancient s3fs
 ]