diff --git a/lite_bootstrap/bootstrappers/base.py b/lite_bootstrap/bootstrappers/base.py
index 881e42e..72b1b3b 100644
--- a/lite_bootstrap/bootstrappers/base.py
+++ b/lite_bootstrap/bootstrappers/base.py
@@ -9,7 +9,7 @@
     InstrumentDependencyMissingWarning,
     collect_teardown_errors,
 )
-from lite_bootstrap.instruments.base import BaseConfig, BaseInstrument
+from lite_bootstrap.instruments.base import BaseInstrument, ConfigT
 from lite_bootstrap.types import ApplicationT
 
 
@@ -19,12 +19,12 @@
 InstrumentT = typing.TypeVar("InstrumentT", bound=BaseInstrument)
 
 
-class BaseBootstrapper(abc.ABC, typing.Generic[ApplicationT]):
+class BaseBootstrapper(abc.ABC, typing.Generic[ApplicationT, ConfigT]):
     instruments_types: typing.ClassVar[list[type[BaseInstrument]]]
     not_ready_message: typing.ClassVar[str]
     instruments: list[BaseInstrument]
     skipped_instruments: list[tuple[type[BaseInstrument], str]]
-    bootstrap_config: BaseConfig
+    bootstrap_config: ConfigT
     _application: ApplicationT
 
     # Marker tagged on a user-supplied app (or its config) once this bootstrapper has
@@ -32,7 +32,7 @@ class BaseBootstrapper(abc.ABC, typing.Generic[ApplicationT]):
     # bootstrapper on the same app from re-attaching. Its accepted limits: ADR-0003.
     _TEARDOWN_MARKER: typing.ClassVar[str] = "_lite_bootstrap_teardown_attached"
 
-    def __init__(self, bootstrap_config: BaseConfig) -> None:
+    def __init__(self, bootstrap_config: ConfigT) -> None:
         self.is_bootstrapped = False
         self._torn_down = False
         # Set when another bootstrapper already owns this application; bootstrap() then refuses.
diff --git a/lite_bootstrap/bootstrappers/fastapi_bootstrapper.py b/lite_bootstrap/bootstrappers/fastapi_bootstrapper.py
index 2f58f04..24e352f 100644
--- a/lite_bootstrap/bootstrappers/fastapi_bootstrapper.py
+++ b/lite_bootstrap/bootstrappers/fastapi_bootstrapper.py
@@ -271,7 +271,7 @@ def bootstrap(self) -> None:
             enable_offline_docs(application, static_path=config.swagger_static_path)
 
 
-class FastAPIBootstrapper(BaseBootstrapper["fastapi.FastAPI"]):
+class FastAPIBootstrapper(BaseBootstrapper["fastapi.FastAPI", FastAPIConfig]):
     __slots__ = "bootstrap_config", "instruments"
 
     instruments_types: typing.ClassVar = [
@@ -284,7 +284,6 @@ class FastAPIBootstrapper(BaseBootstrapper["fastapi.FastAPI"]):
         FastAPIPrometheusInstrument,
         FastAPISwaggerInstrument,
     ]
-    bootstrap_config: FastAPIConfig  # ty: ignore[invalid-mutable-override]
     not_ready_message = "fastapi is not installed"
 
     @contextlib.asynccontextmanager
diff --git a/lite_bootstrap/bootstrappers/fastmcp_bootstrapper.py b/lite_bootstrap/bootstrappers/fastmcp_bootstrapper.py
index 47f7745..a67a421 100644
--- a/lite_bootstrap/bootstrappers/fastmcp_bootstrapper.py
+++ b/lite_bootstrap/bootstrappers/fastmcp_bootstrapper.py
@@ -381,7 +381,7 @@ def bootstrap(self) -> None:
         self.bootstrap_config.application.add_middleware(FastMcpLoggingMiddleware())
 
 
-class FastMcpBootstrapper(BaseBootstrapper["FastMCP[typing.Any]"]):
+class FastMcpBootstrapper(BaseBootstrapper["FastMCP[typing.Any]", FastMcpConfig]):
     __slots__ = "bootstrap_config", "instruments"
 
     instruments_types: typing.ClassVar = [
@@ -392,7 +392,6 @@ class FastMcpBootstrapper(BaseBootstrapper["FastMCP[typing.Any]"]):
         FastMcpLoggingInstrument,
         FastMcpPrometheusInstrument,
     ]
-    bootstrap_config: FastMcpConfig  # ty: ignore[invalid-mutable-override]
     not_ready_message = "fastmcp is not installed"
 
     def is_ready(self) -> bool:
diff --git a/lite_bootstrap/bootstrappers/faststream_bootstrapper.py b/lite_bootstrap/bootstrappers/faststream_bootstrapper.py
index 1a20ab4..641c235 100644
--- a/lite_bootstrap/bootstrappers/faststream_bootstrapper.py
+++ b/lite_bootstrap/bootstrappers/faststream_bootstrapper.py
@@ -222,7 +222,7 @@ def bootstrap(self) -> None:
                 broker.add_middleware(middleware_cls(registry=self.collector_registry))
 
 
-class FastStreamBootstrapper(BaseBootstrapper["AsgiFastStream"]):
+class FastStreamBootstrapper(BaseBootstrapper["AsgiFastStream", FastStreamConfig]):
     __slots__ = "bootstrap_config", "instruments"
 
     instruments_types: typing.ClassVar = [
@@ -233,7 +233,6 @@ class FastStreamBootstrapper(BaseBootstrapper["AsgiFastStream"]):
         FastStreamLoggingInstrument,
         FastStreamPrometheusInstrument,
     ]
-    bootstrap_config: FastStreamConfig  # ty: ignore[invalid-mutable-override]
     not_ready_message = "faststream is not installed"
 
     def is_ready(self) -> bool:
diff --git a/lite_bootstrap/bootstrappers/free_bootstrapper.py b/lite_bootstrap/bootstrappers/free_bootstrapper.py
index 2da2fd6..2428ab5 100644
--- a/lite_bootstrap/bootstrappers/free_bootstrapper.py
+++ b/lite_bootstrap/bootstrappers/free_bootstrapper.py
@@ -12,7 +12,7 @@
 class FreeConfig(LoggingConfig, OpenTelemetryConfig, PyroscopeConfig, SentryConfig): ...
 
 
-class FreeBootstrapper(BaseBootstrapper[None]):
+class FreeBootstrapper(BaseBootstrapper[None, FreeConfig]):
     __slots__ = "bootstrap_config", "instruments"
 
     instruments_types: typing.ClassVar = [
@@ -21,7 +21,6 @@ class FreeBootstrapper(BaseBootstrapper[None]):
         OpenTelemetryInstrument,
         PyroscopeInstrument,
     ]
-    bootstrap_config: FreeConfig  # ty: ignore[invalid-mutable-override]
     not_ready_message = ""
 
     def is_ready(self) -> bool:
diff --git a/lite_bootstrap/bootstrappers/litestar_bootstrapper.py b/lite_bootstrap/bootstrappers/litestar_bootstrapper.py
index 95ccd7d..a912c27 100644
--- a/lite_bootstrap/bootstrappers/litestar_bootstrapper.py
+++ b/lite_bootstrap/bootstrappers/litestar_bootstrapper.py
@@ -479,7 +479,7 @@ def bootstrap(self) -> None:
             )
 
 
-class LitestarBootstrapper(BaseBootstrapper["litestar.Litestar"]):
+class LitestarBootstrapper(BaseBootstrapper["litestar.Litestar", LitestarConfig]):
     __slots__ = "bootstrap_config", "instruments"
 
     instruments_types: typing.ClassVar = [
@@ -492,7 +492,6 @@ class LitestarBootstrapper(BaseBootstrapper["litestar.Litestar"]):
         LitestarPrometheusInstrument,
         LitestarSwaggerInstrument,
     ]
-    bootstrap_config: LitestarConfig  # ty: ignore[invalid-mutable-override]
     not_ready_message = "litestar is not installed"
 
     def __init__(self, bootstrap_config: LitestarConfig) -> None:
diff --git a/tests/instruments/test_logging_record_filters.py b/tests/instruments/test_logging_record_filters.py
index 7acd109..979a7b5 100644
--- a/tests/instruments/test_logging_record_filters.py
+++ b/tests/instruments/test_logging_record_filters.py
@@ -349,7 +349,7 @@ def test_bootstrap_teardown_bootstrap_attaches_each_filter_once() -> None:
 
 BootstrapperBuilder = typing.Callable[
     [dict[str, tuple[logging.Filter, ...]]],
-    BaseBootstrapper[typing.Any],
+    BaseBootstrapper[typing.Any, typing.Any],
 ]