diff --git a/openfeature/_backports/strenum.py b/openfeature/_backports/strenum.py
index ed2d7b34..6dcdfd7d 100644
--- a/openfeature/_backports/strenum.py
+++ b/openfeature/_backports/strenum.py
@@ -1,7 +1,8 @@
 import sys
 
 if sys.version_info >= (3, 11):
-    from enum import StrEnum
+    # re-export needed for type checking
+    from enum import StrEnum as StrEnum  # noqa: PLC0414
 else:
     from enum import Enum
 
diff --git a/openfeature/api.py b/openfeature/api.py
index 902e8b3b..6687bb89 100644
--- a/openfeature/api.py
+++ b/openfeature/api.py
@@ -21,7 +21,7 @@ def get_client(
     return OpenFeatureClient(name=name, version=version, provider=_provider)
 
 
-def set_provider(provider: AbstractProvider):
+def set_provider(provider: AbstractProvider) -> None:
     global _provider
     if provider is None:
         raise GeneralError(error_message="No provider")
@@ -46,19 +46,19 @@ def get_evaluation_context() -> EvaluationContext:
     return _evaluation_context
 
 
-def set_evaluation_context(evaluation_context: EvaluationContext):
+def set_evaluation_context(evaluation_context: EvaluationContext) -> None:
     global _evaluation_context
     if evaluation_context is None:
         raise GeneralError(error_message="No api level evaluation context")
     _evaluation_context = evaluation_context
 
 
-def add_hooks(hooks: typing.List[Hook]):
+def add_hooks(hooks: typing.List[Hook]) -> None:
     global _hooks
     _hooks = _hooks + hooks
 
 
-def clear_hooks():
+def clear_hooks() -> None:
     global _hooks
     _hooks = []
 
@@ -68,5 +68,5 @@ def get_hooks() -> typing.List[Hook]:
     return _hooks
 
 
-def shutdown():
+def shutdown() -> None:
     _provider.shutdown()
diff --git a/openfeature/client.py b/openfeature/client.py
index cc29897f..9b842272 100644
--- a/openfeature/client.py
+++ b/openfeature/client.py
@@ -45,11 +45,21 @@
         FlagResolutionDetails[typing.Union[dict, list]],
     ],
 ]
+TypeMap = typing.Dict[
+    FlagType,
+    typing.Union[
+        typing.Type[bool],
+        typing.Type[int],
+        typing.Type[float],
+        typing.Type[str],
+        typing.Tuple[typing.Type[dict], typing.Type[list]],
+    ],
+]
 
 
 @dataclass
 class ClientMetadata:
-    name: str
+    name: typing.Optional[str]
 
 
 class OpenFeatureClient:
@@ -60,17 +70,17 @@ def __init__(
         provider: AbstractProvider,
         context: typing.Optional[EvaluationContext] = None,
         hooks: typing.Optional[typing.List[Hook]] = None,
-    ):
+    ) -> None:
         self.name = name
         self.version = version
         self.context = context or EvaluationContext()
         self.hooks = hooks or []
         self.provider = provider
 
-    def get_metadata(self):
+    def get_metadata(self) -> ClientMetadata:
         return ClientMetadata(name=self.name)
 
-    def add_hooks(self, hooks: typing.List[Hook]):
+    def add_hooks(self, hooks: typing.List[Hook]) -> None:
         self.hooks = self.hooks + hooks
 
     def get_boolean_value(
@@ -93,7 +103,7 @@ def get_boolean_details(
         default_value: bool,
         evaluation_context: typing.Optional[EvaluationContext] = None,
         flag_evaluation_options: typing.Optional[FlagEvaluationOptions] = None,
-    ) -> FlagEvaluationDetails:
+    ) -> FlagEvaluationDetails[bool]:
         return self.evaluate_flag_details(
             FlagType.BOOLEAN,
             flag_key,
@@ -122,7 +132,7 @@ def get_string_details(
         default_value: str,
         evaluation_context: typing.Optional[EvaluationContext] = None,
         flag_evaluation_options: typing.Optional[FlagEvaluationOptions] = None,
-    ) -> FlagEvaluationDetails:
+    ) -> FlagEvaluationDetails[str]:
         return self.evaluate_flag_details(
             FlagType.STRING,
             flag_key,
@@ -151,7 +161,7 @@ def get_integer_details(
         default_value: int,
         evaluation_context: typing.Optional[EvaluationContext] = None,
         flag_evaluation_options: typing.Optional[FlagEvaluationOptions] = None,
-    ) -> FlagEvaluationDetails:
+    ) -> FlagEvaluationDetails[int]:
         return self.evaluate_flag_details(
             FlagType.INTEGER,
             flag_key,
@@ -180,7 +190,7 @@ def get_float_details(
         default_value: float,
         evaluation_context: typing.Optional[EvaluationContext] = None,
         flag_evaluation_options: typing.Optional[FlagEvaluationOptions] = None,
-    ) -> FlagEvaluationDetails:
+    ) -> FlagEvaluationDetails[float]:
         return self.evaluate_flag_details(
             FlagType.FLOAT,
             flag_key,
@@ -195,7 +205,7 @@ def get_object_value(
         default_value: typing.Union[dict, list],
         evaluation_context: typing.Optional[EvaluationContext] = None,
         flag_evaluation_options: typing.Optional[FlagEvaluationOptions] = None,
-    ) -> dict:
+    ) -> typing.Union[dict, list]:
         return self.get_object_details(
             flag_key,
             default_value,
@@ -209,7 +219,7 @@ def get_object_details(
         default_value: typing.Union[dict, list],
         evaluation_context: typing.Optional[EvaluationContext] = None,
         flag_evaluation_options: typing.Optional[FlagEvaluationOptions] = None,
-    ) -> FlagEvaluationDetails:
+    ) -> FlagEvaluationDetails[typing.Union[dict, list]]:
         return self.evaluate_flag_details(
             FlagType.OBJECT,
             flag_key,
@@ -225,7 +235,7 @@ def evaluate_flag_details(
         default_value: typing.Any,
         evaluation_context: typing.Optional[EvaluationContext] = None,
         flag_evaluation_options: typing.Optional[FlagEvaluationOptions] = None,
-    ) -> FlagEvaluationDetails:
+    ) -> FlagEvaluationDetails[typing.Any]:
         """
         Evaluate the flag requested by the user from the clients provider.
 
@@ -335,7 +345,7 @@ def _create_provider_evaluation(
         flag_key: str,
         default_value: typing.Any,
         evaluation_context: typing.Optional[EvaluationContext] = None,
-    ) -> FlagEvaluationDetails:
+    ) -> FlagEvaluationDetails[typing.Any]:
         """
         Encapsulated method to create a FlagEvaluationDetail from a specific provider.
 
@@ -384,8 +394,8 @@ def _create_provider_evaluation(
         )
 
 
-def _typecheck_flag_value(value, flag_type):
-    type_map = {
+def _typecheck_flag_value(value: typing.Any, flag_type: FlagType) -> None:
+    type_map: TypeMap = {
         FlagType.BOOLEAN: bool,
         FlagType.STRING: str,
         FlagType.OBJECT: (dict, list),
diff --git a/openfeature/hook/__init__.py b/openfeature/hook/__init__.py
index 590843bf..79c20184 100644
--- a/openfeature/hook/__init__.py
+++ b/openfeature/hook/__init__.py
@@ -46,8 +46,11 @@ def before(
         return None
 
     def after(
-        self, hook_context: HookContext, details: FlagEvaluationDetails, hints: dict
-    ):
+        self,
+        hook_context: HookContext,
+        details: FlagEvaluationDetails[typing.Any],
+        hints: dict,
+    ) -> None:
         """
         Runs after a flag is resolved.
 
@@ -58,7 +61,9 @@ def after(
         """
         pass
 
-    def error(self, hook_context: HookContext, exception: Exception, hints: dict):
+    def error(
+        self, hook_context: HookContext, exception: Exception, hints: dict
+    ) -> None:
         """
         Run when evaluation encounters an error. Errors thrown will be swallowed.
 
@@ -68,7 +73,7 @@ def error(self, hook_context: HookContext, exception: Exception, hints: dict):
         """
         pass
 
-    def finally_after(self, hook_context: HookContext, hints: dict):
+    def finally_after(self, hook_context: HookContext, hints: dict) -> None:
         """
         Run after flag evaluation, including any error processing.
         This will always run. Errors will be swallowed.
diff --git a/openfeature/hook/hook_support.py b/openfeature/hook/hook_support.py
index e1432c80..1e530e6a 100644
--- a/openfeature/hook/hook_support.py
+++ b/openfeature/hook/hook_support.py
@@ -13,7 +13,7 @@ def error_hooks(
     exception: Exception,
     hooks: typing.List[Hook],
     hints: typing.Optional[typing.Mapping] = None,
-):
+) -> None:
     kwargs = {"hook_context": hook_context, "exception": exception, "hints": hints}
     _execute_hooks(
         flag_type=flag_type, hooks=hooks, hook_method=HookType.ERROR, **kwargs
@@ -25,7 +25,7 @@ def after_all_hooks(
     hook_context: HookContext,
     hooks: typing.List[Hook],
     hints: typing.Optional[typing.Mapping] = None,
-):
+) -> None:
     kwargs = {"hook_context": hook_context, "hints": hints}
     _execute_hooks(
         flag_type=flag_type, hooks=hooks, hook_method=HookType.FINALLY_AFTER, **kwargs
@@ -35,10 +35,10 @@ def after_all_hooks(
 def after_hooks(
     flag_type: FlagType,
     hook_context: HookContext,
-    details: FlagEvaluationDetails,
+    details: FlagEvaluationDetails[typing.Any],
     hooks: typing.List[Hook],
     hints: typing.Optional[typing.Mapping] = None,
-):
+) -> None:
     kwargs = {"hook_context": hook_context, "details": details, "hints": hints}
     _execute_hooks_unchecked(
         flag_type=flag_type, hooks=hooks, hook_method=HookType.AFTER, **kwargs
@@ -55,7 +55,7 @@ def before_hooks(
     executed_hooks = _execute_hooks_unchecked(
         flag_type=flag_type, hooks=hooks, hook_method=HookType.BEFORE, **kwargs
     )
-    filtered_hooks = list(filter(lambda hook: hook is not None, executed_hooks))
+    filtered_hooks = [result for result in executed_hooks if result is not None]
 
     if filtered_hooks:
         return reduce(lambda a, b: a.merge(b), filtered_hooks)
@@ -64,7 +64,10 @@ def before_hooks(
 
 
 def _execute_hooks(
-    flag_type: FlagType, hooks: typing.List[Hook], hook_method: HookType, **kwargs
+    flag_type: FlagType,
+    hooks: typing.List[Hook],
+    hook_method: HookType,
+    **kwargs: typing.Any,
 ) -> list:
     """
     Run multiple hooks of any hook type. All of these hooks will be run through an
@@ -84,8 +87,11 @@ def _execute_hooks(
 
 
 def _execute_hooks_unchecked(
-    flag_type: FlagType, hooks, hook_method: HookType, **kwargs
-) -> list:
+    flag_type: FlagType,
+    hooks: typing.List[Hook],
+    hook_method: HookType,
+    **kwargs: typing.Any,
+) -> typing.List[typing.Optional[EvaluationContext]]:
     """
     Execute a single hook without checking whether an exception is thrown. This is
     used in the before and after hooks since any exception will be caught in the
@@ -104,7 +110,9 @@ def _execute_hooks_unchecked(
     ]
 
 
-def _execute_hook_checked(hook: Hook, hook_method: HookType, **kwargs):
+def _execute_hook_checked(
+    hook: Hook, hook_method: HookType, **kwargs: typing.Any
+) -> typing.Optional[EvaluationContext]:
     """
     Try and run a single hook and catch any exception thrown. This is used in the
     after all and error hooks since any error thrown at this point needs to be caught.
@@ -115,6 +123,10 @@ def _execute_hook_checked(hook: Hook, hook_method: HookType, **kwargs):
     :return: the result of the hook method
     """
     try:
-        return getattr(hook, hook_method.value)(**kwargs)
+        return typing.cast(
+            "typing.Optional[EvaluationContext]",
+            getattr(hook, hook_method.value)(**kwargs),
+        )
     except Exception:  # pragma: no cover
         logging.error(f"Exception when running {hook_method.value} hooks")
+        return None
diff --git a/openfeature/provider/in_memory_provider.py b/openfeature/provider/in_memory_provider.py
index 2495d2dc..7fe7e735 100644
--- a/openfeature/provider/in_memory_provider.py
+++ b/openfeature/provider/in_memory_provider.py
@@ -32,7 +32,7 @@ class State(StrEnum):
     state: State = State.ENABLED
     context_evaluator: typing.Optional[
         typing.Callable[
-            ["InMemoryFlag", EvaluationContext], FlagResolutionDetails[T_co]
+            ["InMemoryFlag[T_co]", EvaluationContext], FlagResolutionDetails[T_co]
         ]
     ] = None
 
@@ -52,7 +52,7 @@ def resolve(
         )
 
 
-FlagStorage = typing.Dict[str, InMemoryFlag]
+FlagStorage = typing.Dict[str, InMemoryFlag[typing.Any]]
 
 V = typing.TypeVar("V")
 
@@ -60,7 +60,7 @@ def resolve(
 class InMemoryProvider(AbstractProvider):
     _flags: FlagStorage
 
-    def __init__(self, flags: FlagStorage):
+    def __init__(self, flags: FlagStorage) -> None:
         self._flags = flags.copy()
 
     def get_metadata(self) -> Metadata:
diff --git a/openfeature/provider/provider.py b/openfeature/provider/provider.py
index 73ce37b5..625b7f6b 100644
--- a/openfeature/provider/provider.py
+++ b/openfeature/provider/provider.py
@@ -8,10 +8,10 @@
 
 
 class AbstractProvider:
-    def initialize(self, evaluation_context: EvaluationContext):
+    def initialize(self, evaluation_context: EvaluationContext) -> None:
         pass
 
-    def shutdown(self):
+    def shutdown(self) -> None:
         pass
 
     @abstractmethod
diff --git a/pyproject.toml b/pyproject.toml
index c92bfdfd..bd236e71 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,9 @@ Homepage = "https://github.com/open-feature/python-sdk"
 files = "openfeature"
 namespace_packages = true
 explicit_package_bases = true
+pretty = true
+strict = true
+disallow_any_generics = false
 
 [tool.ruff]
 exclude = [