diff --git a/nucypher/policy/conditions/evm.py b/nucypher/policy/conditions/evm.py
index 36bf8bbc2..d2d5edc6b 100644
--- a/nucypher/policy/conditions/evm.py
+++ b/nucypher/policy/conditions/evm.py
@@ -31,17 +31,14 @@ from nucypher.policy.conditions.base import ReencryptionCondition
 from nucypher.policy.conditions.context import get_context_value, is_context_variable
 from nucypher.policy.conditions.lingo import ReturnValueTest
 
+
 # Permitted blockchains for condition evaluation
-_CONDITION_CHAINS = {
-    1: "Ethereum",  # TODO: 60 ?
-    5: "Goerli",
-    # 6: "Kotti",
-    # 42: "Kovan",
-    # 77: "Sokol",
-    # 100: "xDai",
-    137: "Polygon/Mainnet",
-    80001: "Polygon/Mumbai"
-}
+_CONDITION_CHAINS = (
+    1,     # ethereum/mainnet
+    5,     # ethereum/goerli
+    137,   # polygon/mainnet
+    80001  # polygon/mumbai
+)
 
 
 def _resolve_abi(standard_contract_type: str, method: str, function_abi: List) -> List:
diff --git a/tests/acceptance/blockchain/conditions/conftest.py b/tests/acceptance/blockchain/conditions/conftest.py
index 833a508fc..5829cd98b 100644
--- a/tests/acceptance/blockchain/conditions/conftest.py
+++ b/tests/acceptance/blockchain/conditions/conftest.py
@@ -22,6 +22,7 @@ from pathlib import Path
 import pytest
 from web3 import Web3
 
+import nucypher
 import tests.data
 from nucypher.blockchain.eth.agents import (
     ContractAgency,
@@ -33,7 +34,7 @@ from nucypher.blockchain.eth.sol.compile.compile import multiversion_compile
 from nucypher.blockchain.eth.sol.compile.types import SourceBundle
 from nucypher.crypto.powers import TransactingPower
 from nucypher.policy.conditions.context import USER_ADDRESS_CONTEXT
-from nucypher.policy.conditions.evm import ContractCondition, RPCCondition, _CONDITION_CHAINS
+from nucypher.policy.conditions.evm import ContractCondition, RPCCondition
 from nucypher.policy.conditions.lingo import AND, OR, ConditionLingo, ReturnValueTest
 from nucypher.policy.conditions.time import TimeCondition
 from tests.constants import TESTERCHAIN_CHAIN_ID
@@ -47,7 +48,8 @@ with open(VECTORS_FILE, 'r') as file:
 
 @pytest.fixture(autouse=True)
 def mock_condition_blockchains(mocker):
-    mocker.patch.dict(_CONDITION_CHAINS, {131277322940537: 'testerchain'})
+    """adds testerchain to permitted conditional chains"""
+    mocker.patch.object(nucypher.policy.conditions.evm, '_CONDITION_CHAINS', tuple([131277322940537]))
 
 
 @pytest.fixture()
diff --git a/tests/unit/conditions/conftest.py b/tests/unit/conditions/conftest.py
index 30af02b88..ef3022c0a 100644
--- a/tests/unit/conditions/conftest.py
+++ b/tests/unit/conditions/conftest.py
@@ -21,9 +21,10 @@ from pathlib import Path
 import pytest
 from web3 import Web3
 
+import nucypher
 import tests
 from nucypher.policy.conditions.context import USER_ADDRESS_CONTEXT
-from nucypher.policy.conditions.evm import ContractCondition, RPCCondition, _CONDITION_CHAINS
+from nucypher.policy.conditions.evm import ContractCondition, RPCCondition
 from nucypher.policy.conditions.lingo import AND, OR, ConditionLingo, ReturnValueTest
 from nucypher.policy.conditions.time import TimeCondition
 from tests.constants import TESTERCHAIN_CHAIN_ID
@@ -36,7 +37,8 @@ with open(VECTORS_FILE, 'r') as file:
 
 @pytest.fixture(autouse=True)
 def mock_condition_blockchains(mocker):
-    mocker.patch.dict(_CONDITION_CHAINS, {131277322940537: 'testerchain'})
+    """adds testerchain to permitted conditional chains"""
+    mocker.patch.object(nucypher.policy.conditions.evm, '_CONDITION_CHAINS', tuple([131277322940537]))
 
 
 # ERC1155