diff --git a/setup.py b/setup.py
index cc5e39865..792ef42fa 100644
--- a/setup.py
+++ b/setup.py
@@ -503,8 +503,7 @@ setup(
         "eth-typing>=2.1.0,<3.0.0",
         "pycryptodome==3.9.4",
         "py_ecc==4.0.0",
-        "milagro_bls_binding==1.0.2",
-        "py_ecc==4.0.0",
+        "milagro_bls_binding==1.2.0",
         "dataclasses==0.6",
         "remerkleable==0.1.13",
         "ruamel.yaml==0.16.5",
diff --git a/tests/core/pyspec/eth2spec/utils/bls.py b/tests/core/pyspec/eth2spec/utils/bls.py
index 320e3bc93..778b23da7 100644
--- a/tests/core/pyspec/eth2spec/utils/bls.py
+++ b/tests/core/pyspec/eth2spec/utils/bls.py
@@ -10,7 +10,8 @@ bls = py_ecc_bls
 
 STUB_SIGNATURE = b'\x11' * 96
 STUB_PUBKEY = b'\x22' * 48
-STUB_COORDINATES = _signature_to_G2(bls.Sign(0, b""))
+Z2_SIGNATURE = b'\xc0' + b'\x00' * 95
+STUB_COORDINATES = _signature_to_G2(Z2_SIGNATURE)
 
 
 def only_with_bls(alt_return=None):
@@ -67,7 +68,7 @@ def Sign(SK, message):
     if bls == py_ecc_bls:
         return bls.Sign(SK, message)
     else:
-        return bls.Sign(SK.to_bytes(48, 'big'), message)
+        return bls.Sign(SK.to_bytes(32, 'big'), message)
 
 
 @only_with_bls(alt_return=STUB_COORDINATES)
diff --git a/tests/generators/bls/main.py b/tests/generators/bls/main.py
index 8c6589b36..9e10b4044 100644
--- a/tests/generators/bls/main.py
+++ b/tests/generators/bls/main.py
@@ -2,18 +2,22 @@
 BLS test vectors generator
 """
 
+from hashlib import sha256
 from typing import Tuple, Iterable, Any, Callable, Dict
 
 from eth_utils import (
     encode_hex,
     int_to_big_endian,
 )
-from gen_base import gen_runner, gen_typing
+import milagro_bls_binding as milagro_bls
 
 from eth2spec.utils import bls
-from hashlib import sha256
-
 from eth2spec.test.context import PHASE0
+from gen_base import gen_runner, gen_typing
+
+
+def to_bytes(i):
+    return i.to_bytes(32, "big")
 
 
 def hash(x):
@@ -70,8 +74,15 @@ def case02_verify():
             # Valid signature
             signature = bls.Sign(privkey, message)
             pubkey = bls.SkToPk(privkey)
+
+            assert milagro_bls.SkToPk(to_bytes(privkey)) == pubkey
+            assert milagro_bls.Sign(to_bytes(privkey), message) == signature
+
             identifier = f'{encode_hex(pubkey)}_{encode_hex(message)}'
+
             assert bls.Verify(pubkey, message, signature)
+            assert milagro_bls.Verify(pubkey, message, signature)
+
             yield f'verify_valid_case_{(hash(bytes(identifier, "utf-8"))[:8]).hex()}', {
                 'input': {
                     'pubkey': encode_hex(pubkey),
@@ -85,6 +96,7 @@ def case02_verify():
             wrong_pubkey = bls.SkToPk(PRIVKEYS[(i + 1) % len(PRIVKEYS)])
             identifier = f'{encode_hex(wrong_pubkey)}_{encode_hex(message)}'
             assert not bls.Verify(wrong_pubkey, message, signature)
+            assert not milagro_bls.Verify(wrong_pubkey, message, signature)
             yield f'verify_wrong_pubkey_case_{(hash(bytes(identifier, "utf-8"))[:8]).hex()}', {
                 'input': {
                     'pubkey': encode_hex(wrong_pubkey),
@@ -98,6 +110,7 @@ def case02_verify():
             tampered_signature = signature[:-4] + b'\xFF\xFF\xFF\xFF'
             identifier = f'{encode_hex(pubkey)}_{encode_hex(message)}'
             assert not bls.Verify(pubkey, message, tampered_signature)
+            assert not milagro_bls.Verify(pubkey, message, tampered_signature)
             yield f'verify_tampered_signature_case_{(hash(bytes(identifier, "utf-8"))[:8]).hex()}', {
                 'input': {
                     'pubkey': encode_hex(pubkey),
@@ -109,6 +122,7 @@ def case02_verify():
 
         # Valid pubkey and signature with the point at infinity
         assert bls.Verify(Z1_PUBKEY, message, Z2_SIGNATURE)
+        assert milagro_bls.Verify(Z1_PUBKEY, message, Z2_SIGNATURE)
         yield f'verify_infinity_pubkey_and_infinity_signature', {
             'input': {
                 'pubkey': encode_hex(Z1_PUBKEY),
@@ -152,6 +166,7 @@ def case04_fast_aggregate_verify():
         # Valid signature
         identifier = f'{pubkeys_serial}_{encode_hex(message)}'
         assert bls.FastAggregateVerify(pubkeys, message, aggregate_signature)
+        assert milagro_bls.FastAggregateVerify(pubkeys, message, aggregate_signature)
         yield f'fast_aggregate_verify_valid_{(hash(bytes(identifier, "utf-8"))[:8]).hex()}', {
             'input': {
                 'pubkeys': pubkeys_serial,
@@ -166,6 +181,7 @@ def case04_fast_aggregate_verify():
         pubkeys_extra_serial = [encode_hex(pubkey) for pubkey in pubkeys_extra]
         identifier = f'{pubkeys_extra_serial}_{encode_hex(message)}'
         assert not bls.FastAggregateVerify(pubkeys_extra, message, aggregate_signature)
+        assert not milagro_bls.FastAggregateVerify(pubkeys_extra, message, aggregate_signature)
         yield f'fast_aggregate_verify_extra_pubkey_{(hash(bytes(identifier, "utf-8"))[:8]).hex()}', {
             'input': {
                 'pubkeys': pubkeys_extra_serial,
@@ -179,6 +195,7 @@ def case04_fast_aggregate_verify():
         tampered_signature = aggregate_signature[:-4] + b'\xff\xff\xff\xff'
         identifier = f'{pubkeys_serial}_{encode_hex(message)}'
         assert not bls.FastAggregateVerify(pubkeys, message, tampered_signature)
+        assert not milagro_bls.FastAggregateVerify(pubkeys, message, tampered_signature)
         yield f'fast_aggregate_verify_tampered_signature_{(hash(bytes(identifier, "utf-8"))[:8]).hex()}', {
             'input': {
                 'pubkeys': pubkeys_serial,
@@ -190,6 +207,7 @@ def case04_fast_aggregate_verify():
 
     # Invalid pubkeys and signature -- len(pubkeys) == 0 and signature == Z1_SIGNATURE
     assert not bls.FastAggregateVerify([], message, Z2_SIGNATURE)
+    assert not milagro_bls.FastAggregateVerify([], message, Z2_SIGNATURE)
     yield f'fast_aggregate_verify_na_pubkeys_and_infinity_signature', {
         'input': {
             'pubkeys': [],
@@ -201,6 +219,7 @@ def case04_fast_aggregate_verify():
 
     # Invalid pubkeys and signature -- len(pubkeys) == 0 and signature == 0x00...
     assert not bls.FastAggregateVerify([], message, NO_SIGNATURE)
+    assert not milagro_bls.FastAggregateVerify([], message, NO_SIGNATURE)
     yield f'fast_aggregate_verify_na_pubkeys_and_na_signature', {
         'input': {
             'pubkeys': [],
@@ -228,6 +247,7 @@ def case05_aggregate_verify():
 
     aggregate_signature = bls.Aggregate(sigs)
     assert bls.AggregateVerify(pubkeys, messages, aggregate_signature)
+    assert milagro_bls.AggregateVerify(pubkeys, messages, aggregate_signature)
     yield f'aggregate_verify_valid', {
         'input': {
             'pubkeys': pubkeys_serial,
@@ -239,6 +259,7 @@ def case05_aggregate_verify():
 
     tampered_signature = aggregate_signature[:4] + b'\xff\xff\xff\xff'
     assert not bls.AggregateVerify(pubkey, messages, tampered_signature)
+    assert not milagro_bls.AggregateVerify(pubkeys, messages, tampered_signature)
     yield f'aggregate_verify_tampered_signature', {
         'input': {
             'pubkeys': pubkeys_serial,
@@ -250,6 +271,7 @@ def case05_aggregate_verify():
 
     # Invalid pubkeys and signature -- len(pubkeys) == 0 and signature == Z1_SIGNATURE
     assert not bls.AggregateVerify([], [], Z2_SIGNATURE)
+    assert not milagro_bls.AggregateVerify([], [], Z2_SIGNATURE)
     yield f'aggregate_verify_na_pubkeys_and_infinity_signature', {
         'input': {
             'pubkeys': [],
@@ -261,6 +283,7 @@ def case05_aggregate_verify():
 
     # Invalid pubkeys and signature -- len(pubkeys) == 0 and signature == 0x00...
     assert not bls.AggregateVerify([], [], NO_SIGNATURE)
+    assert not milagro_bls.AggregateVerify([], [], NO_SIGNATURE)
     yield f'aggregate_verify_na_pubkeys_and_na_signature', {
         'input': {
             'pubkeys': [],