diff --git a/docs/instrumentation.html b/docs/instrumentation.html
index 3d898da..ad841b2 100644
--- a/docs/instrumentation.html
+++ b/docs/instrumentation.html
@@ -809,7 +809,7 @@ <h2 id="returns">Returns</h2>
 </details>
 </dd>
 <dt id="prometheus_fastapi_instrumentator.instrumentation.PrometheusFastApiInstrumentator.expose"><code class="name flex">
-<span>def <span class="ident">expose</span></span>(<span>self, app: fastapi.applications.FastAPI, should_gzip: bool = False, endpoint: str = '/metrics', include_in_schema: bool = True, tags: Union[List[str], NoneType] = None, **kwargs)</span>
+<span>def <span class="ident">expose</span></span>(<span>self, app: fastapi.applications.FastAPI, should_gzip: bool = False, endpoint: str = '/metrics', include_in_schema: bool = True, tags: Optional[List[str]] = None, **kwargs)</span>
 </code></dt>
 <dd>
 <div class="desc"><p>Exposes endpoint for metrics.</p>
diff --git a/docs/metrics.html b/docs/metrics.html
index 41ffa7d..06a6c31 100644
--- a/docs/metrics.html
+++ b/docs/metrics.html
@@ -1466,7 +1466,7 @@ <h2 class="section-title" id="header-classes">Classes</h2>
 <dl>
 <dt id="prometheus_fastapi_instrumentator.metrics.Info"><code class="flex name class">
 <span>class <span class="ident">Info</span></span>
-<span>(</span><span>request: starlette.requests.Request, response: Union[starlette.responses.Response, NoneType], method: str, modified_handler: str, modified_status: str, modified_duration: float)</span>
+<span>(</span><span>request: starlette.requests.Request, response: Optional[starlette.responses.Response], method: str, modified_handler: str, modified_status: str, modified_duration: float)</span>
 </code></dt>
 <dd>
 <div class="desc"><p>Creates Info object that is used for instrumentation functions.</p>