diff --git a/tests/conftest.py b/tests/conftest.py
index 26b3568..21b98ca 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,9 +1,12 @@
 """Fixtures for tests."""
 
+import random
 import sys
 from pathlib import Path
 
+import numpy as np
 import pytest
+import torch
 
 from autocorpus.ac_bioc import (
     BioCAnnotation,
@@ -130,3 +133,17 @@ def pytest_collection_modifyitems(config, items):
             item.add_marker(skip_ci_macos)
         if "skip_ci_windows" in item.keywords:
             item.add_marker(skip_ci_windows)
+
+
+def set_random_seeds(seed: int = 0) -> None:
+    """Fix random number generator seeds used by stochastic algorithms."""
+    random.seed(seed)
+    np.random.seed(seed)
+    torch.manual_seed(seed)
+    torch.cuda.manual_seed_all(seed)
+
+
+@pytest.fixture(scope="session", autouse=True)
+def deterministic_session():
+    """Session-scoped fixture to set random seeds for test reproducibility."""
+    set_random_seeds(1234)