diff --git a/contracts/main/CurveTwocryptoOptimized.vy b/contracts/main/CurveTwocryptoOptimized.vy
index 4c409b59..c4089642 100644
--- a/contracts/main/CurveTwocryptoOptimized.vy
+++ b/contracts/main/CurveTwocryptoOptimized.vy
@@ -1250,13 +1250,11 @@ def _fee(xp: uint256[N_COINS]) -> uint256:
 @internal
 @pure
 def get_xcp(D: uint256, price_scale: uint256) -> uint256:
+    return isqrt(
+        unsafe_div(D, N_COINS) * # <------------- xp[0]
+        D * PRECISION / (price_scale * N_COINS) # xp[1]
+    ) # <------------------------------- Geometric mean
 
-    x: uint256[N_COINS] = [
-        unsafe_div(D, N_COINS),
-        D * PRECISION / (price_scale * N_COINS)
-    ]
-
-    return isqrt(x[0] * x[1])  # <------------------- Geometric Mean.
 
 
 @view
diff --git a/requirements.txt b/requirements.txt
index a2b9e663..931c4383 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,5 +23,5 @@ pandas
 matplotlib
 
 # vyper and dev framework:
-git+https://github.com/vyperlang/titanoboa@87593bb5c4d02bb8eaf4cc93e0e940ebf9a37900
+git+https://github.com/vyperlang/titanoboa@8c2f673c10439d13b976d1f1667462810379f010
 vyper>=0.3.10
diff --git a/tests/unitary/math/test_newton_D.py b/tests/unitary/math/test_newton_D.py
index d1cfe5b7..efdc0d88 100644
--- a/tests/unitary/math/test_newton_D.py
+++ b/tests/unitary/math/test_newton_D.py
@@ -4,7 +4,6 @@
 from decimal import Decimal
 
 import pytest
-from boa.vyper.contract import BoaError
 from hypothesis import given, settings
 from hypothesis import strategies as st
 
diff --git a/tests/unitary/math/test_newton_D_ref.py b/tests/unitary/math/test_newton_D_ref.py
index 6852c39d..aa49b7b2 100644
--- a/tests/unitary/math/test_newton_D_ref.py
+++ b/tests/unitary/math/test_newton_D_ref.py
@@ -3,7 +3,7 @@
 from decimal import Decimal
 
 import pytest
-from boa.vyper.contract import BoaError
+from boa import BoaError
 from hypothesis import given, settings
 from hypothesis import strategies as st