diff --git a/pyproject.toml b/pyproject.toml
index d143c2f..05dca6f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ dependencies = [
     "h5netcdf",
     "h5py",
     "hdf5plugin",
+    "msgpack",
     "numba",
     "numpy",
     "obspy",