diff --git a/requirements.txt b/requirements.txt
index 31f0802..e4f7ca6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ requests>=2.28.0
 
 # Instrument File Import — M17 (optional — install what you need)
 # jcamp>=1.2.0      # JCAMP-DX (.jdx, .dx): IR, Raman, NMR, MS spectra  [parser unreliable in CI]
-h5py>=3.0.0       # HDF5 (.h5, .hdf5): simulation outputs, large arrays
+h5py>=3.14.0       # HDF5 (.h5, .hdf5): simulation outputs, large arrays
 xarray>=0.20.0    # NetCDF (.nc, .cdf): atmospheric/oceanographic data
 netcdf4>=1.6.0    # NetCDF engine used by xarray
 # spc>=0.2          # Thermo Fisher SPC (.spc): Raman/IR spectra  [unmaintained; requires ez_setup]