diff --git a/src/primaite/session/environment.py b/src/primaite/session/environment.py
index ac9415ac..0fd21b9f 100644
--- a/src/primaite/session/environment.py
+++ b/src/primaite/session/environment.py
@@ -42,7 +42,8 @@ def set_random_seed(seed: int, generate_seed_value: bool) -> Union[None, int]:
     if seed is None or seed == -1:
         if generate_seed_value:
             rng = np.random.default_rng()
-            seed = int(rng.integers(low=0, high=2**63))
+            # 2**32-1 is highest value for python RNG seed.
+            seed = int(rng.integers(low=0, high=2**32-1))
         else:
             return None
     elif seed < -1: