diff --git a/web/CHANGES.md b/web/CHANGES.md
index 43fc37a9..e2dd29d3 100644
--- a/web/CHANGES.md
+++ b/web/CHANGES.md
@@ -1,4 +1,6 @@
 # unreleased
+## Add
+- `StateRef` can used for extracting `?Sized` type from application state.
 
 # 0.2.1
 ## Add
diff --git a/web/Cargo.toml b/web/Cargo.toml
index d17700d1..81050972 100644
--- a/web/Cargo.toml
+++ b/web/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "xitca-web"
-version = "0.2.1"
+version = "0.2.2"
 edition = "2021"
 license = "Apache-2.0"
 description = "an async web framework"
diff --git a/web/src/handler/types/state.rs b/web/src/handler/types/state.rs
index 27da954f..c87f411a 100644
--- a/web/src/handler/types/state.rs
+++ b/web/src/handler/types/state.rs
@@ -6,7 +6,9 @@ use crate::{body::BodyStream, context::WebContext, error::Error, handler::FromRe
 
 /// App state extractor.
 /// S type must be the same with the type passed to App::with_xxx_state(S).
-pub struct StateRef<'a, S>(pub &'a S);
+pub struct StateRef<'a, S>(pub &'a S)
+where
+    S: ?Sized;
 
 impl<S: fmt::Debug> fmt::Debug for StateRef<'_, S> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -32,7 +34,7 @@ impl<'a, 'r, C, B, T> FromRequest<'a, WebContext<'r, C, B>> for StateRef<'a, T>
 where
     C: Borrow<T>,
     B: BodyStream,
-    T: 'static,
+    T: ?Sized + 'static,
 {
     type Type<'b> = StateRef<'b, T>;
     type Error = Error<C>;