diff --git a/simulations/11_pulsed_timing.py b/simulations/11_pulsed_timing.py
index eb7fb7f..a2e36a9 100755
--- a/simulations/11_pulsed_timing.py
+++ b/simulations/11_pulsed_timing.py
@@ -5,10 +5,20 @@ from lib import util
 from scipy import signal, interpolate, stats
 import matplotlib.pyplot as plt
 import numpy as np
-from itertools import zip_longest, pairwise
+from itertools import zip_longest
 import h5py
 from copy import deepcopy
 
+try:
+    from itertools import pairwise
+except: # pairwise only introduced since python 3.10
+    from itertools import tee
+    def pairwise(iterable):
+        # pairwise('ABCDEFG') --> AB BC CD DE EF FG
+        a, b = tee(iterable)
+        next(b, None)
+        return zip(a, b)
+
 try:
     from tqdm import tqdm
 except: