diff --git a/j1939/j1939_22.py b/j1939/j1939_22.py
index c55cf93..16f32d9 100644
--- a/j1939/j1939_22.py
+++ b/j1939/j1939_22.py
@@ -2,7 +2,6 @@
 from .message_id import MessageId, FrameFormat
 import logging
 import time
-import numpy as np
 
 logger = logging.getLogger(__name__)
 
@@ -267,13 +266,9 @@ def send_pgn(self, data_page, pdu_format, pdu_specific, priority, src_address, d
             if priority == None: priority = 7
 
             # get chunks from data
-            full_tp_size_packages = int(data_length/self.DataLength.TP)
-            arr = np.array(data)
-            list_of_arr = np.split(arr, [full_tp_size_packages*self.DataLength.TP])
-            arr = np.reshape(list_of_arr[0], (-1,self.DataLength.TP))
-            data_list = arr.tolist()
+            list_of_arr, data_list = self.get_chunks(data, data_length)
             if len(list_of_arr) > 1:
-                data_list.append(list_of_arr[1].tolist())
+                data_list.append(list_of_arr[1])
 
             # if the PF is between 240 and 255, the message can only be broadcast
             if dest_address == ParameterGroupNumber.Address.GLOBAL:
@@ -319,6 +314,13 @@ def send_pgn(self, data_page, pdu_format, pdu_specific, priority, src_address, d
 
         return True
 
+    def get_chunks(self, data, data_length):
+        full_tp_size_packages = int(data_length / self.DataLength.TP)
+        index = full_tp_size_packages * self.DataLength.TP
+        list_of_arr = [data[:index], data[index:]]
+        data_list = [list_of_arr[0][i : (i + min(self.DataLength.TP, len(list_of_arr[0]) - i))] for i in range(0, len(list_of_arr[0]), self.DataLength.TP)]
+        return list_of_arr, data_list
+
     def __send_multi_pg(self, frame_format, cpg_list, src_address, dst_address):
         # deadline reached
         priority = 7
diff --git a/setup.py b/setup.py
index 8885ff7..0594b8c 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,6 @@
     ],
     install_requires=[
         "python-can >= 3.3.4",
-        "numpy >= 1.17.0",
         "pytest >= 6.2.5",
     ],
     include_package_data=True,