diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index fcc2d23..f57d8e4 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -38,7 +38,11 @@ jobs:
           /opt/interop/bin/pip install --no-cache-dir h5py numpy netCDF4 xarray hdf5plugin
           echo "/opt/interop/bin" >> "$GITHUB_PATH"
       - name: Show interop library versions
-        run: /opt/interop/bin/python -c "import h5py, netCDF4, hdf5plugin; print('h5py', h5py.__version__, 'HDF5', h5py.version.hdf5_version, 'netCDF4', netCDF4.__version__, 'hdf5plugin', hdf5plugin.version)"
+        # h5dump's version too: the h5rs dump test requires its exact output
+        # (checked against Debian's 1.14.5 in rust:latest and 1.14.6).
+        run: |
+          /opt/interop/bin/python -c "import h5py, netCDF4, hdf5plugin; print('h5py', h5py.__version__, 'HDF5', h5py.version.hdf5_version, 'netCDF4', netCDF4.__version__, 'hdf5plugin', hdf5plugin.version)"
+          h5dump --version
       - name: Run CI script
         env:
           # Name the interpreter outright rather than relying on $GITHUB_PATH
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbaf30b..beb4f6d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -121,7 +121,8 @@
     address, link count, layout and chunk index, chunk size, storage,
     filters, datatype and attributes.
   - `h5rs dump [--json] [-A] [-p] [-d PATH] FILE` prints DDL text that is
-    byte-identical to h5dump 1.14.6's on the test files (all layouts and
+    byte-identical to h5dump 1.14.6's (and to Debian's 1.14.5, which CI
+    uses) on the test files (all layouts and
     chunk indexes, v1/v2 groups, compound, enum, strings, links, named
     types, attributes; null-padded strings show their NULs at any depth),
     or JSON in the HDF Group's hdf5-json layout (schema in the crate
diff --git a/crates/clawhdf5-tools/README.md b/crates/clawhdf5-tools/README.md
index e045498..2c1dab5 100644
--- a/crates/clawhdf5-tools/README.md
+++ b/crates/clawhdf5-tools/README.md
@@ -71,7 +71,9 @@ The DDL output is h5dump's: on the test files of `tests/gen_files.py`
 groups; integers of both byte orders, floats, compound with an array member,
 enum, fixed and variable-length strings; soft, external and hard links; a
 named datatype; compact and dense attributes) `h5rs dump` and `h5rs dump -A`
-print the same bytes as h5dump 1.14.6 — `dump_matches_h5dump` in
+print the same bytes as h5dump 1.14.6 and as Debian's h5dump 1.14.5 (the
+`hdf5-tools` package CI installs in `rust:latest`; the whole interop suite
+was run in that image on 2026-09-26) — `dump_matches_h5dump` in
 `tests/h5rs_interop.rs` checks this, and `dump_shows_nul_padding_in_nested_strings`
 that null-padded strings show their NULs (`"a\000b"`) at any depth, as
 h5dump's do. Not covered by those tests: references, opaque, bitfield,