diff --git a/RespCoarseAlign.py b/RespCoarseAlign.py
index 7aac9f8..b104053 100644
--- a/RespCoarseAlign.py
+++ b/RespCoarseAlign.py
@@ -19,7 +19,7 @@ from PySide6.QtGui import QPixmap, QImage
 from PySide6.QtWidgets import QApplication, QMainWindow, QFileDialog, QMessageBox, QWidget, QPushButton
 from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
 from matplotlib.figure import Figure
-from numba import njit
+from numba import njit, prange
 from scipy import signal
 
 from ui.Mian import Ui_mainWindow as Ui_respCoarseAlign
@@ -512,7 +512,7 @@ class Data:
 @njit("int64[:](int64[:],int64[:])", nogil=True, parallel=True)
 def get_Correlate(a, v):
     result = np.empty(len(a) - len(v) * 1 - 1, dtype=np.int64)
-    for i in range(len(a) - len(v) - 1):
+    for i in prange(len(a) - len(v) - 1):
         result[i] = np.sum(a[i:i + len(v)] * v)
     return result
 
diff --git a/requirements.txt b/requirements.txt
index 1936a6c..42b8b4e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+python >=3.9
 numpy
 pandas
 scipy