diff --git a/.travis.yml b/.travis.yml
index 4da6eb14..46bf2db8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,8 @@ python:
 addons:
   apt:
     packages:
-      -
+      - rustc
+      - cargo
 install:
   - pip install codecov
   - pip install tox tox-travis
diff --git a/src/cryptojwt/jws/dsa.py b/src/cryptojwt/jws/dsa.py
index 796146b2..dc780ad2 100644
--- a/src/cryptojwt/jws/dsa.py
+++ b/src/cryptojwt/jws/dsa.py
@@ -3,7 +3,6 @@
 from cryptography.hazmat.primitives.asymmetric import ec
 from cryptography.hazmat.primitives.asymmetric.utils import decode_dss_signature
 from cryptography.hazmat.primitives.asymmetric.utils import encode_dss_signature
-from cryptography.utils import int_from_bytes
 from cryptography.utils import int_to_bytes
 
 from ..exception import BadSignature
@@ -102,6 +101,6 @@ def _split_raw_signature(sig):
         :return: A 2-tuple
         """
         c_length = len(sig) // 2
-        r = int_from_bytes(sig[:c_length], byteorder="big")
-        s = int_from_bytes(sig[c_length:], byteorder="big")
+        r = int.from_bytes(sig[:c_length], byteorder="big")
+        s = int.from_bytes(sig[c_length:], byteorder="big")
         return r, s