diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 2bd7f23b7..afa1ea657 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -590,6 +590,7 @@ Eth2 makes use of BLS signatures as specified in the [IETF draft BLS specificati
 - `def Verify(PK: BLSPubkey, message: Bytes, signature: BLSSignature) -> bool`
 - `def Aggregate(signatures: Sequence[BLSSignature]) -> BLSSignature`
 - `def FastAggregateVerify(PKs: Sequence[BLSSignature], message: Bytes, signature: BLSSignature) -> bool`
+- `def AggregateVerify(pairs: Sequence[PK: BLSSignature, message: Bytes], signature: BLSSignature) -> bool`
 
 Within these specifications, BLS signatures are treated as a module for notational clarity, thus to verify a signature `bls.Verify(...)` is used.
 
diff --git a/specs/core/1_custody-game.md b/specs/core/1_custody-game.md
index 4df9c3352..fdaf9af42 100644
--- a/specs/core/1_custody-game.md
+++ b/specs/core/1_custody-game.md
@@ -483,7 +483,7 @@ def process_early_derived_secret_reveal(state: BeaconState, reveal: EarlyDerived
 
     domain = get_domain(state, DOMAIN_RANDAO, reveal.epoch)
     signing_roots = [compute_signing_root(root, domain) for root in [hash_tree_root(reveal.epoch), reveal.mask]]
-    assert bls.AggregateVerify(pubkeys, signing_roots, reveal.reveal)
+    assert bls.AggregateVerify(zip(pubkeys, signing_roots), reveal.reveal)
 
     if reveal.epoch >= get_current_epoch(state) + CUSTODY_PERIOD_TO_RANDAO_PADDING:
         # Full slashing when the secret was revealed so early it may be a valid custody
diff --git a/test_libs/pyspec/eth2spec/test/helpers/keys.py b/test_libs/pyspec/eth2spec/test/helpers/keys.py
index f47cd7c10..23bb95131 100644
--- a/test_libs/pyspec/eth2spec/test/helpers/keys.py
+++ b/test_libs/pyspec/eth2spec/test/helpers/keys.py
@@ -1,6 +1,6 @@
-from py_ecc import bls
+from py_ecc.bls import G2ProofOfPossession as bls
 from eth2spec.phase0 import spec
 
 privkeys = [i + 1 for i in range(spec.SLOTS_PER_EPOCH * 16)]
-pubkeys = [bls.privtopub(privkey) for privkey in privkeys]
+pubkeys = [bls.PrivToPub(privkey) for privkey in privkeys]
 pubkey_to_privkey = {pubkey: privkey for privkey, pubkey in zip(privkeys, pubkeys)}
diff --git a/test_libs/pyspec/eth2spec/utils/bls.py b/test_libs/pyspec/eth2spec/utils/bls.py
index 3cfc6121e..83371ac62 100644
--- a/test_libs/pyspec/eth2spec/utils/bls.py
+++ b/test_libs/pyspec/eth2spec/utils/bls.py
@@ -1,11 +1,12 @@
-from py_ecc import bls
+from py_ecc.bls import G2ProofOfPossession as bls
+from py_ecc.bls.g2_primatives import signature_to_G2 as _signature_to_G2
 
 # Flag to make BLS active or not. Used for testing, do not ignore BLS in production unless you know what you are doing.
 bls_active = True
 
 STUB_SIGNATURE = b'\x11' * 96
 STUB_PUBKEY = b'\x22' * 48
-STUB_COORDINATES = bls.api.signature_to_G2(bls.sign(b"", 0, b"\0" * 8))
+STUB_COORDINATES = _signature_to_G2(bls.Sign(0, b""))
 
 
 def only_with_bls(alt_return=None):
@@ -24,30 +25,29 @@ def only_with_bls(alt_return=None):
 
 @only_with_bls(alt_return=True)
 def Verify(PK, message, signature):
-    return bls.verify(message_hash=message, pubkey=PK, signature=signature, domain=b'')
+    return bls.Verify(PK, message, signature)
 
 
 @only_with_bls(alt_return=True)
-def AggregateVerify(PKs, messages, signature):
-    return bls.verify_multiple(pubkeys=PKs, message_hashes=messages, signature=signature, domain=b'')
+def AggregateVerify(pairs, signature):
+    return bls.AggregateVerify(pairs, signature)
 
 
 @only_with_bls(alt_return=True)
 def FastAggregateVerify(PKs, message, signature):
-    aggregate_pubkey = bls.aggregate_pubkeys(PKs)
-    return bls.verify(pubkey=aggregate_pubkey, message_hash=message, signature=signature, domain=b'')
+    return bls.FastAggregateVerify(PKs, message, signature)
 
 
 @only_with_bls(alt_return=STUB_SIGNATURE)
 def Aggregate(signatures):
-    return bls.aggregate_signatures(signatures)
+    return bls.Aggregate(signatures)
 
 
 @only_with_bls(alt_return=STUB_SIGNATURE)
 def Sign(SK, message):
-    return bls.sign(message_hash=message, privkey=SK, domain=b'')
+    return bls.Sign(SK, message)
 
 
 @only_with_bls(alt_return=STUB_COORDINATES)
 def signature_to_G2(signature):
-    return bls.api.signature_to_G2(signature)
+    return _signature_to_G2(signature)
diff --git a/test_libs/pyspec/requirements.txt b/test_libs/pyspec/requirements.txt
index 8dfbccf66..60acb5d35 100644
--- a/test_libs/pyspec/requirements.txt
+++ b/test_libs/pyspec/requirements.txt
@@ -1,6 +1,6 @@
 eth-utils>=1.3.0,<2
 eth-typing>=2.1.0,<3.0.0
 pycryptodome==3.9.4
-py_ecc==1.7.1
+py_ecc==2.0.0
 dataclasses==0.6
 ssz==0.1.3