diff --git a/tests/core/contracts/test_contract_buildTransaction.py b/tests/core/contracts/test_contract_buildTransaction.py
index bfdc71b9a0..18ade12c7f 100644
--- a/tests/core/contracts/test_contract_buildTransaction.py
+++ b/tests/core/contracts/test_contract_buildTransaction.py
@@ -4,40 +4,13 @@
     dissoc,
 )
 
-from web3 import Web3
 from web3.exceptions import (
     ValidationError,
 )
-from web3.middleware import (
-    local_filter_middleware,
-)
-from web3.providers.eth_tester import (
-    EthereumTesterProvider,
-)
 
 # -*- coding: utf-8 -*-
 
 
-# Ignore warning in pyethereum 1.6 - will go away with the upgrade
-pytestmark = pytest.mark.filterwarnings("ignore:implicit cast from 'char *'")
-
-
-# Ignore warning in pyethereum 1.6 - will go away with the upgrade
-pytestmark = pytest.mark.filterwarnings("ignore:implicit cast from 'char *'")
-
-
-@pytest.fixture(
-    params=[True, False],
-    ids=["local_filter_middleware", "node_based_filter"])
-def web3(request):
-    use_filter_middleware = request.param
-    provider = EthereumTesterProvider()
-    w3 = Web3(provider)
-    if use_filter_middleware:
-        w3.middleware_onion.add(local_filter_middleware)
-    return w3
-
-
 @pytest.fixture()
 def math_contract(web3, MathContract, address_conversion_func):
     deploy_txn = MathContract.constructor().transact()
diff --git a/tests/core/filtering/conftest.py b/tests/core/filtering/conftest.py
index f0cd8cc23b..a3f4cf4552 100644
--- a/tests/core/filtering/conftest.py
+++ b/tests/core/filtering/conftest.py
@@ -27,6 +27,7 @@ def tester_snapshot(web3):
 
 
 @pytest.fixture(
+    scope='function',
     params=[True, False],
     ids=["local_filter_middleware", "node_based_filter"])
 def web3(request):
diff --git a/tests/core/filtering/test_contract_data_filters.py b/tests/core/filtering/test_contract_data_filters.py
index 9da071420f..24dfb883f0 100644
--- a/tests/core/filtering/test_contract_data_filters.py
+++ b/tests/core/filtering/test_contract_data_filters.py
@@ -19,9 +19,6 @@
     EthereumTesterProvider,
 )
 
-# Ignore warning in pyethereum 1.6 - will go away with the upgrade
-pytestmark = pytest.mark.filterwarnings("ignore:implicit cast from 'char *'")
-
 
 @pytest.fixture(
     scope="module",
diff --git a/tests/core/filtering/test_contract_on_event_filtering.py b/tests/core/filtering/test_contract_on_event_filtering.py
index 4e635c2c1a..9c2174d153 100644
--- a/tests/core/filtering/test_contract_on_event_filtering.py
+++ b/tests/core/filtering/test_contract_on_event_filtering.py
@@ -4,29 +4,6 @@
     is_address,
 )
 
-from web3 import Web3
-from web3.middleware import (
-    local_filter_middleware,
-)
-from web3.providers.eth_tester import (
-    EthereumTesterProvider,
-)
-
-# Ignore warning in pyethereum 1.6 - will go away with the upgrade
-pytestmark = pytest.mark.filterwarnings("ignore:implicit cast from 'char *'")
-
-
-@pytest.fixture(
-    params=[True, False],
-    ids=["local_filter_middleware", "node_based_filter"])
-def web3(request):
-    use_filter_middleware = request.param
-    provider = EthereumTesterProvider()
-    w3 = Web3(provider)
-    if use_filter_middleware:
-        w3.middleware_onion.add(local_filter_middleware)
-    return w3
-
 
 @pytest.mark.parametrize('call_as_instance', (True, False))
 def test_create_filter_address_parameter(web3, emitter, Emitter, call_as_instance):