diff --git a/src/ui.py b/src/ui.py
index 2cc5b04..63fb8bb 100644
--- a/src/ui.py
+++ b/src/ui.py
@@ -1,4 +1,5 @@
 from typing import TypedDict
+import hashlib
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -127,7 +128,8 @@ class OptimizationUI(QWidget):
 
         seed = self.seed_input.text()
         if seed != "":
-            bit_gen = np.random.PCG64(abs(hash(seed)))
+            seed_int = int.from_bytes(hashlib.sha256(seed.encode("utf-8")).digest())
+            bit_gen = np.random.PCG64(seed_int)
             rng = np.random.Generator(bit_gen)
         else:
             rng = None