diff --git a/km3buu/output.py b/km3buu/output.py
index 69d07a5ba26d9316d741d2e4a91276383b02489f..64811ed4cf71944c71ec0628a6bb5f361a1154eb 100644
--- a/km3buu/output.py
+++ b/km3buu/output.py
@@ -18,8 +18,8 @@ from io import StringIO
 from os import listdir
 from os.path import isfile, join, abspath
 from tempfile import TemporaryDirectory
-import awkward1
-import uproot4
+import awkward as ak
+import uproot
 from scipy.interpolate import UnivariateSpline
 from scipy.spatial.transform import Rotation
 import scipy.constants as constants
@@ -202,7 +202,7 @@ class GiBUUOutput:
 
         Parameters
         ----------
-            roottuple_data: awkward1.highlevel.Array                
+            roottuple_data: awkward.highlevel.Array                
         """
         d = roottuple_data
         k_in = np.vstack([
@@ -233,7 +233,7 @@ class GiBUUOutput:
 
         Parameters
         ----------
-            roottuple_data: awkward1.highlevel.Array                
+            roottuple_data: awkward.highlevel.Array                
         """
         d = roottuple_data
         y = 1 - np.divide(np.array(d.lepOut_E), np.array(d.lepIn_E))
@@ -257,7 +257,7 @@ class GiBUUOutput:
         GiBUU output data in pandas dataframe format
         """
         import pandas as pd
-        df = awkward1.to_pandas(self.arrays)
+        df = ak.to_pandas(self.arrays)
         sec_df = df[df.index.get_level_values(1) == 0].copy()
         sec_df.loc[:, "E"] = sec_df.lepOut_E
         sec_df.loc[:, "Px"] = sec_df.lepOut_Px
@@ -275,11 +275,11 @@ class GiBUUOutput:
     @property
     def arrays(self):
         """
-        GiBUU output data in awkward1 format
+        GiBUU output data in awkward format
         """
         retval = None
         for ifile in self.root_pert_files:
-            fobj = uproot4.open(join(self.data_path, ifile))
+            fobj = uproot.open(join(self.data_path, ifile))
             if retval is None:
                 retval = fobj["RootTuple"].arrays()
             else:
diff --git a/km3buu/propagation.py b/km3buu/propagation.py
index 8c69262fd47c8757bca61d9b11ee7aff925c641b..6a0564c3ade29872ff8c0168f04e891f1ffd0304 100644
--- a/km3buu/propagation.py
+++ b/km3buu/propagation.py
@@ -16,7 +16,7 @@ import numpy as np
 import scipy.constants as const
 import proposal as pp
 from particle import Particle
-import awkward1 as ak
+import awkward as ak
 from collections import defaultdict
 
 from .config import Config
@@ -61,7 +61,7 @@ def propagate_lepton(lepout_data, pdgid):
 
     Parameters
     ----------
-    lepout_data: awkward1.highlevel.Array
+    lepout_data: awkward.highlevel.Array
         Lepton data in the GiBUU output shape containing the fields 
         'lepOut_E, lepOut_Px, lepOut_Py, lepOut_Pz'
     pdgid:
@@ -69,7 +69,7 @@ def propagate_lepton(lepout_data, pdgid):
 
     Returns
     -------
-    awkward1.highlevel.Array (E, Px, Py, Pz, x, y, z)
+    awkward.highlevel.Array (E, Px, Py, Pz, x, y, z)
     """
     lepton_info = Particle.from_pdgid(pdgid)
     prop_range = const.c * lepton_info.lifetime * 1e11 * np.max(
diff --git a/km3buu/tests/test_propagation.py b/km3buu/tests/test_propagation.py
index 6689676b8b01bce6d3ab32a2f50037fbd945ccc8..6b013f02fb804e24058de9bccd24b1e86d3ff78c 100644
--- a/km3buu/tests/test_propagation.py
+++ b/km3buu/tests/test_propagation.py
@@ -13,7 +13,7 @@ __status__ = "Development"
 import csv
 import unittest
 import numpy as np
-import uproot4
+import uproot
 from os.path import abspath, join, dirname
 from thepipe.logger import get_logger
 from km3net_testdata import data_path
@@ -34,7 +34,7 @@ class TestTauPropagation(unittest.TestCase):
         log.setLevel("INFO")
         self.gibuu_output = GiBUUOutput(TESTDATA_DIR)
         fname = join(TESTDATA_DIR, self.gibuu_output.root_pert_files[0])
-        fobj = uproot4.open(fname)
+        fobj = uproot.open(fname)
         data = fobj["RootTuple"].arrays()
         self.sec = propagate_lepton(data, 15)
 
diff --git a/requirements.txt b/requirements.txt
index 3e1e9b0cc22d92a2c684c633837efa32dc6a2df4..48c448b27c767dbf526dd3a2cf5f9a10060c8213 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,8 +6,8 @@ thepipe
 particle
 click
 f90nml
-uproot4
-awkward1>=0.4.4
+uproot>=4.0.0
+awkward>=1.0.0
 pandas
 mendeleev
 proposal