diff --git a/projects/data/data.smk b/projects/data/data.smk
index f43c58b62..431900bb7 100644
--- a/projects/data/data.smk
+++ b/projects/data/data.smk
@@ -413,6 +413,8 @@ The PSDs are those of the last fetched train-background chunk.
         lowpass=config["lowpass"] or "null",
         snr_threshold=config["snr_threshold"],
         max_num_samples=config["max_num_samples"],
+        # offset by branch so each branch samples different parameters
+        seed=lambda wc: config["seed"] + int(wc.vbranch_id),
     shell:
         "generate-validation-waveforms"
         " --num_signals {params.num_signals}"
@@ -429,6 +431,7 @@ The PSDs are those of the last fetched train-background chunk.
         " --snr_threshold {params.snr_threshold}"
         " --psd {input.psd_file}"
         " --max_num_samples {params.max_num_samples}"
+        " --seed {params.seed}"
         " --output_file {output}"
         " &> {log}"
 
diff --git a/projects/data/data/waveforms/rejection.py b/projects/data/data/waveforms/rejection.py
index 92cef3f76..e7a739829 100644
--- a/projects/data/data/waveforms/rejection.py
+++ b/projects/data/data/waveforms/rejection.py
@@ -4,6 +4,7 @@
 
 import numpy as np
 import torch
+from bilby.core.utils import random as bilby_random
 from data.waveforms.utils import convert_to_detector_frame, load_psds
 from ledger.injections import (
     BilbyParameterSet,
@@ -30,7 +31,12 @@ def rejection_sample(
     snr_threshold: float,
     psd: Path | torch.Tensor,
     max_num_samples: int,
+    seed: int | None = None,
 ) -> tuple[ResponseSetFields, InjectionParameterSet]:
+    # bilby priors sample from bilby's own generator
+    if seed is not None:
+        bilby_random.seed(seed)
+
     # get the detector tensors and vertices
     # for projecting our waveforms
     tensors, vertices = get_ifo_geometry(*ifos)
diff --git a/projects/data/data/waveforms/utils.py b/projects/data/data/waveforms/utils.py
index 8c155f300..60bd9a8a7 100644
--- a/projects/data/data/waveforms/utils.py
+++ b/projects/data/data/waveforms/utils.py
@@ -1,12 +1,13 @@
+import hashlib
 import logging
 import random
 import time
 from pathlib import Path
-from zlib import adler32
 
 import h5py
 import numpy as np
 import torch
+from bilby.core.utils import random as bilby_random
 from gwpy.timeseries import TimeSeriesDict
 
 
@@ -22,13 +23,16 @@ def seed_worker(
     start: float, stop: float, shifts: list[float], seed: int
 ) -> np.random.Generator:
     fingerprint = str((start, stop) + tuple(shifts))
-    worker_hash = adler32(fingerprint.encode())
+    digest = hashlib.sha256(fingerprint.encode()).digest()
+    worker_hash = int.from_bytes(digest[:8], "big")
     combined = seed + worker_hash
     logging.info(
         f"Seeding data generation with seed {seed}, "
         f"augmented by worker seed {worker_hash}"
     )
     random.seed(combined)
+    # bilby priors sample from bilby's own generator
+    bilby_random.seed(combined)
     return np.random.default_rng(combined)