diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b40096a..24efb07 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,18 +10,18 @@ repos:
       - id: isort
 
 -   repo: https://github.com/psf/black
-    rev: 22.6.0
+    rev: 22.10.0
     hooks:
       - id: black
         name: black
 
 -   repo: https://gitlab.com/pycqa/flake8
-    rev: 4.0.1
+    rev: 5.0.4
     hooks:
     -   id: flake8
 
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.971
+    rev: v0.982
     hooks:
     -   id: mypy
         additional_dependencies: [types-PyYAML, types-requests]
diff --git a/evm_trace/gas.py b/evm_trace/gas.py
index b3c8687..d5b4996 100644
--- a/evm_trace/gas.py
+++ b/evm_trace/gas.py
@@ -1,9 +1,11 @@
 import copy
-from typing import Any, Dict, List
+from typing import Dict, List, TypeVar
 
 from evm_trace.base import CallTreeNode
 
-GasReport = Dict[Any, Dict[Any, List[int]]]
+ContractID = TypeVar("ContractID")
+MethodID = TypeVar("MethodID")
+GasReport = Dict[ContractID, Dict[MethodID, List[int]]]
 
 
 def get_gas_report(calltree: CallTreeNode) -> GasReport:
@@ -14,7 +16,7 @@ def get_gas_report(calltree: CallTreeNode) -> GasReport:
         calltree (:class:`~evm_trace.base.CallTreeNode`): call tree used for gas report.
 
     Returns:
-        :class:`~evm_trace.gas.Report`: Gas report structure from a call tree.
+        :class:`~evm_trace.gas.GasReport`: Gas report structure from a call tree.
     """
     report = {
         calltree.address: {calltree.calldata[:4]: [calltree.gas_cost] if calltree.gas_cost else []}
diff --git a/evm_trace/parity.py b/evm_trace/parity.py
index fa999ce..7861f39 100644
--- a/evm_trace/parity.py
+++ b/evm_trace/parity.py
@@ -105,8 +105,6 @@ def get_calltree_from_parity_trace(
           likely loaded from the response data from the ``trace_transaction`` RPC response.
         root (:class:`~evm_trace.parity.ParityTrace`): The root parity trace node. Optional, uses
           the first item by default.
-        display_cls (Type[DisplayableCallTreeNode]]: A custom class to use for representing
-          the call tree. Defaults to :class:`~evm_trace.display.DisplayableCallTreeNode`.
         **root_kwargs: Additional kwargs to append to the root node. Useful for adding gas for
           reverted calls.
 
diff --git a/evm_trace/vmtrace.py b/evm_trace/vmtrace.py
index 080c69d..244bffa 100644
--- a/evm_trace/vmtrace.py
+++ b/evm_trace/vmtrace.py
@@ -2,12 +2,12 @@
 
 from typing import Any, Dict, Iterator, List, Optional, Type, Union
 
-from eth.vm.memory import Memory  # type: ignore
-from eth.vm.stack import Stack  # type: ignore
+from eth.vm.memory import Memory
+from eth.vm.stack import Stack
 from eth_utils import to_checksum_address
 from hexbytes import HexBytes
-from msgspec import Struct  # type: ignore
-from msgspec.json import Decoder  # type: ignore
+from msgspec import Struct
+from msgspec.json import Decoder
 
 # opcodes grouped by the number of items they pop from the stack
 # fmt: off
diff --git a/setup.py b/setup.py
index 1f7638e..011757d 100644
--- a/setup.py
+++ b/setup.py
@@ -11,9 +11,9 @@
         "eth-hash[pysha3]",  # For eth-utils address checksumming
     ],
     "lint": [
-        "black>=22.6.0",  # auto-formatter and linter
-        "mypy>=0.971",  # Static type analyzer
-        "flake8>=4.0.1",  # Style linter
+        "black>=22.10.0",  # auto-formatter and linter
+        "mypy>=0.982",  # Static type analyzer
+        "flake8>=5.0.4",  # Style linter
         "isort>=5.10.1",  # Import sorting linter
     ],
     "release": [  # `release` GitHub Action job uses this
diff --git a/tests/test_gas_report.py b/tests/test_gas_report.py
index 4301288..c9134f6 100644
--- a/tests/test_gas_report.py
+++ b/tests/test_gas_report.py
@@ -6,32 +6,42 @@
 from evm_trace.gas import GasReport, get_gas_report, merge_reports
 
 # Simplified version of gas reports only for testing purposes
+CONTRACT_A = HexBytes("0x0000000000000000000000000000000000000001")
+CONTRACT_B = HexBytes("0x0000000000000000000000000000000000000002")
+CONTRACT_C = HexBytes("0x0000000000000000000000000000000000000003")
+METHOD_A = HexBytes("0x181d60da")
+METHOD_B = HexBytes("0xc7cee1b7")
+METHOD_C = HexBytes("0xd76d0659")
+
 reports: List[GasReport] = [
     {
-        HexBytes("1"): {HexBytes("10"): [1]},
-        HexBytes("2"): {HexBytes("20"): [2]},
+        CONTRACT_A: {METHOD_A: [100, 101, 100, 102]},
+        CONTRACT_B: {METHOD_B: [200, 202, 202, 200, 200]},
     },
     {
-        HexBytes("1"): {HexBytes("10"): [1]},
-        HexBytes("2"): {HexBytes("21"): [2]},
-        HexBytes("3"): {HexBytes("30"): [3]},
+        CONTRACT_A: {METHOD_A: [105, 106]},
+        CONTRACT_B: {METHOD_A: [200, 201]},
+        CONTRACT_C: {METHOD_C: [300]},
     },
 ]
 
 
-def test_builds_gas_report(call_tree_data):
+def test_get_gas_report(call_tree_data):
     tree = CallTreeNode(**call_tree_data)
     gas_report = get_gas_report(tree)
 
-    for call in tree.calls:
-        assert call.address in gas_report
+    def assert_all(t):
+        assert t.address in gas_report
+        for c in t.calls:
+            assert_all(c)
+
+    assert_all(tree)
 
 
 def test_merged_reports():
     merged = merge_reports(*reports)
-
     assert merged == {
-        HexBytes("0x01"): {HexBytes("0x10"): [1, 1]},
-        HexBytes("0x02"): {HexBytes("0x20"): [2], HexBytes("0x21"): [2]},
-        HexBytes("0x03"): {HexBytes("0x30"): [3]},
+        CONTRACT_A: {METHOD_A: [100, 101, 100, 102, 105, 106]},
+        CONTRACT_B: {METHOD_A: [200, 201], METHOD_B: [200, 202, 202, 200, 200]},
+        CONTRACT_C: {METHOD_C: [300]},
     }