diff --git a/dbt_common/clients/agate_helper.py b/dbt_common/clients/agate_helper.py
index 3aade66d..934b0b11 100644
--- a/dbt_common/clients/agate_helper.py
+++ b/dbt_common/clients/agate_helper.py
@@ -149,7 +149,7 @@ def as_matrix(table):
     return [r.values() for r in table.rows.values()]
 
 
-def from_csv(abspath, text_columns, delimiter=","):
+def from_csv(abspath, text_columns, delimiter=",") -> agate.Table:
     type_tester = build_type_tester(text_columns=text_columns)
     with open(abspath, encoding="utf-8") as fp:
         if fp.read(1) != BOM:
diff --git a/dbt_common/clients/jinja.py b/dbt_common/clients/jinja.py
index 44d3eade..653231c1 100644
--- a/dbt_common/clients/jinja.py
+++ b/dbt_common/clients/jinja.py
@@ -9,12 +9,12 @@
 from typing import Any, Callable, Dict, Iterator, List, Mapping, Optional, Union, Set, Type
 from typing_extensions import Protocol
 
-import jinja2  # type: ignore
-import jinja2.ext  # type: ignore
-import jinja2.nativetypes  # type: ignore
-import jinja2.nodes  # type: ignore
-import jinja2.parser  # type: ignore
-import jinja2.sandbox  # type: ignore
+import jinja2
+import jinja2.ext
+import jinja2.nativetypes
+import jinja2.nodes
+import jinja2.parser
+import jinja2.sandbox
 
 from dbt_common.tests import test_caching_enabled
 from dbt_common.utils.jinja import (
diff --git a/dbt_common/contracts/config/metadata.py b/dbt_common/contracts/config/metadata.py
index 83f3457e..563e6079 100644
--- a/dbt_common/contracts/config/metadata.py
+++ b/dbt_common/contracts/config/metadata.py
@@ -9,7 +9,7 @@
 
 class Metadata(Enum):
     @classmethod
-    def from_field(cls: Type[M], fld: Field) -> M:
+    def from_field(cls: Type[M], fld: Field[Any]) -> M:
         default = cls.default_field()
         key = cls.metadata_key()
 
@@ -28,7 +28,7 @@ def metadata_key(cls) -> str:
         raise NotImplementedError("Not implemented")
 
 
-def _get_meta_value(cls: Type[M], fld: Field, key: str, default: Any) -> M:
+def _get_meta_value(cls: Type[M], fld: Field[Any], key: str, default: Any) -> M:
     # a metadata field might exist. If it does, it might have a matching key.
     # If it has both, make sure the value is valid and return it. If it
     # doesn't, return the default.
@@ -65,5 +65,5 @@ def metadata_key(cls) -> str:
         return "show_hide"
 
     @classmethod
-    def should_show(cls, fld: Field) -> bool:
+    def should_show(cls, fld: Field[Any]) -> bool:
         return cls.from_field(fld) == cls.Show
diff --git a/dbt_common/dataclass_schema.py b/dbt_common/dataclass_schema.py
index 4e003b13..8721fe4b 100644
--- a/dbt_common/dataclass_schema.py
+++ b/dbt_common/dataclass_schema.py
@@ -1,4 +1,4 @@
-from typing import Any, cast, ClassVar, Dict, get_type_hints, List, Optional, Tuple
+from typing import Any, ClassVar, Dict, get_type_hints, List, Optional, Tuple, Union
 import re
 import jsonschema
 from dataclasses import fields, Field
@@ -6,7 +6,6 @@
 from datetime import datetime
 from dateutil.parser import parse
 
-# type: ignore
 from mashumaro.config import (
     TO_DICT_ADD_OMIT_NONE_FLAG,
     ADD_SERIALIZATION_CONTEXT,
@@ -33,8 +32,8 @@ def serialize(self, value: datetime) -> str:
             out += "Z"
         return out
 
-    def deserialize(self, value) -> datetime:
-        return value if isinstance(value, datetime) else parse(cast(str, value))
+    def deserialize(self, value: Union[datetime, str]) -> datetime:
+        return value if isinstance(value, datetime) else parse(value)
 
 
 class dbtMashConfig(MashBaseConfig):
@@ -63,7 +62,7 @@ class dbtClassMixin(DataClassMessagePackMixin):
     against the schema
     """
 
-    _mapped_fields: ClassVar[Optional[Dict[Any, List[Tuple[Field, str]]]]] = None
+    _mapped_fields: ClassVar[Optional[Dict[Any, List[Tuple[Field[Any], str]]]]] = None
 
     # Config class used by Mashumaro
     class Config(dbtMashConfig):
diff --git a/tests/unit/test_connection_retries.py b/tests/unit/test_connection_retries.py
index 44fc72f5..12352352 100644
--- a/tests/unit/test_connection_retries.py
+++ b/tests/unit/test_connection_retries.py
@@ -5,12 +5,12 @@
 from dbt_common.utils.connection import connection_exception_retry
 
 
-def no_retry_fn():
+def no_retry_fn() -> str:
     return "success"
 
 
 class TestNoRetries:
-    def test_no_retry(self):
+    def test_no_retry(self) -> None:
         fn_to_retry = functools.partial(no_retry_fn)
         result = connection_exception_retry(fn_to_retry, 3)
 
diff --git a/tests/unit/test_diff.py b/tests/unit/test_diff.py
index 54f735e3..26d9d490 100644
--- a/tests/unit/test_diff.py
+++ b/tests/unit/test_diff.py
@@ -1,12 +1,14 @@
 import json
-from typing import Any, Dict
+from typing import Any, Dict, List
 
 import pytest
 from dbt_common.record import Diff
 
+Case = List[Dict[str, Any]]
+
 
 @pytest.fixture
-def current_query():
+def current_query() -> Case:
     return [
         {
             "params": {
@@ -21,7 +23,7 @@ def current_query():
 
 
 @pytest.fixture
-def query_modified_order():
+def query_modified_order() -> Case:
     return [
         {
             "params": {
@@ -36,7 +38,7 @@ def query_modified_order():
 
 
 @pytest.fixture
-def query_modified_value():
+def query_modified_value() -> Case:
     return [
         {
             "params": {
@@ -51,7 +53,7 @@ def query_modified_value():
 
 
 @pytest.fixture
-def current_simple():
+def current_simple() -> Case:
     return [
         {
             "params": {
@@ -65,7 +67,7 @@ def current_simple():
 
 
 @pytest.fixture
-def current_simple_modified():
+def current_simple_modified() -> Case:
     return [
         {
             "params": {
@@ -79,7 +81,7 @@ def current_simple_modified():
 
 
 @pytest.fixture
-def env_record():
+def env_record() -> Case:
     return [
         {
             "params": {},
@@ -94,7 +96,7 @@ def env_record():
 
 
 @pytest.fixture
-def modified_env_record():
+def modified_env_record() -> Case:
     return [
         {
             "params": {},
@@ -108,30 +110,30 @@ def modified_env_record():
     ]
 
 
-def test_diff_query_records_no_diff(current_query, query_modified_order):
+def test_diff_query_records_no_diff(current_query: Case, query_modified_order: Case) -> None:
     # Setup: Create an instance of Diff
     diff_instance = Diff(
         current_recording_path="path/to/current", previous_recording_path="path/to/previous"
     )
     result = diff_instance.diff_query_records(current_query, query_modified_order)
     # the order changed but the diff should be empty
-    expected_result = {}
+    expected_result: Dict[str, Any] = {}
     assert result == expected_result  # Replace expected_result with what you actually expect
 
 
-def test_diff_query_records_with_diff(current_query, query_modified_value):
+def test_diff_query_records_with_diff(current_query: Case, query_modified_value: Case) -> None:
     diff_instance = Diff(
         current_recording_path="path/to/current", previous_recording_path="path/to/previous"
     )
     result = diff_instance.diff_query_records(current_query, query_modified_value)
     # the values changed this time
-    expected_result = {
+    expected_result: Dict[str, Any] = {
         "values_changed": {"root[0]['result']['table'][1]['b']": {"new_value": 7, "old_value": 10}}
     }
     assert result == expected_result
 
 
-def test_diff_env_records(env_record, modified_env_record):
+def test_diff_env_records(env_record: Case, modified_env_record: Case) -> None:
     diff_instance = Diff(
         current_recording_path="path/to/current", previous_recording_path="path/to/previous"
     )
@@ -147,17 +149,17 @@ def test_diff_env_records(env_record, modified_env_record):
     assert result == expected_result
 
 
-def test_diff_default_no_diff(current_simple):
+def test_diff_default_no_diff(current_simple: Case) -> None:
     diff_instance = Diff(
         current_recording_path="path/to/current", previous_recording_path="path/to/previous"
     )
     # use the same list to ensure no diff
     result = diff_instance.diff_default(current_simple, current_simple)
-    expected_result = {}
+    expected_result: Dict[str, Any] = {}
     assert result == expected_result
 
 
-def test_diff_default_with_diff(current_simple, current_simple_modified):
+def test_diff_default_with_diff(current_simple: Case, current_simple_modified: Case) -> None:
     diff_instance = Diff(
         current_recording_path="path/to/current", previous_recording_path="path/to/previous"
     )
@@ -170,7 +172,7 @@ def test_diff_default_with_diff(current_simple, current_simple_modified):
 
 # Mock out reading the files so we don't have to
 class MockFile:
-    def __init__(self, json_data):
+    def __init__(self, json_data) -> None:
         self.json_data = json_data
 
     def __enter__(self):
diff --git a/tests/unit/test_functions.py b/tests/unit/test_functions.py
index 372b2bda..9a8a9c22 100644
--- a/tests/unit/test_functions.py
+++ b/tests/unit/test_functions.py
@@ -38,7 +38,7 @@ def valid_error_names() -> Set[str]:
 
 
 class TestWarnOrError:
-    def test_fires_error(self, valid_error_names: Set[str]):
+    def test_fires_error(self, valid_error_names: Set[str]) -> None:
         functions.WARN_ERROR_OPTIONS = WarnErrorOptions(
             include="*", valid_error_names=valid_error_names
         )
@@ -49,8 +49,8 @@ def test_fires_warning(
         self,
         valid_error_names: Set[str],
         event_catcher: EventCatcher,
-        set_event_manager_with_catcher,
-    ):
+        set_event_manager_with_catcher: None,
+    ) -> None:
         functions.WARN_ERROR_OPTIONS = WarnErrorOptions(
             include="*", exclude=list(valid_error_names), valid_error_names=valid_error_names
         )
@@ -62,8 +62,8 @@ def test_silenced(
         self,
         valid_error_names: Set[str],
         event_catcher: EventCatcher,
-        set_event_manager_with_catcher,
-    ):
+        set_event_manager_with_catcher: None,
+    ) -> None:
         functions.WARN_ERROR_OPTIONS = WarnErrorOptions(
             include="*", silence=list(valid_error_names), valid_error_names=valid_error_names
         )
diff --git a/tests/unit/test_jinja.py b/tests/unit/test_jinja.py
index e906a0ac..cf44eee7 100644
--- a/tests/unit/test_jinja.py
+++ b/tests/unit/test_jinja.py
@@ -227,7 +227,7 @@ def test_incomplete_block_failure(self) -> None:
             with self.assertRaises(CompilationError):
                 extract_toplevel_blocks(body, allowed_blocks={"myblock"})
 
-    def test_wrong_end_failure(self):
+    def test_wrong_end_failure(self) -> None:
         body = "{% myblock foo %} {% endotherblock %}"
         with self.assertRaises(CompilationError):
             extract_toplevel_blocks(body, allowed_blocks={"myblock", "otherblock"})
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
index 93c57046..bb5563e2 100644
--- a/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@ -1,4 +1,5 @@
 import unittest
+from typing import Any, Tuple, Union
 
 import dbt_common.exceptions
 import dbt_common.utils.dict
@@ -68,7 +69,7 @@ def setUp(self) -> None:
         }
 
     @staticmethod
-    def intify_all(value, _):
+    def intify_all(value, _) -> int:
         try:
             return int(value)
         except (TypeError, ValueError):
@@ -98,7 +99,7 @@ def test__simple_cases(self) -> None:
         self.assertEqual(actual, expected)
 
     @staticmethod
-    def special_keypath(value, keypath):
+    def special_keypath(value: Any, keypath: Tuple[Union[str, int], ...]) -> Any:
         if tuple(keypath) == ("foo", "baz", 1):
             return "hello"
         else: