diff --git a/Cargo.toml b/Cargo.toml
index b0f0e26..b44c0fb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "web-rwkv"
-version = "0.6.12"
+version = "0.6.13"
 edition = "2021"
 authors = ["Zhenyuan Zhang <cryscan@umich.edu>"]
 license = "MIT OR Apache-2.0"
@@ -17,9 +17,9 @@ exclude = ["assets/", "crates/", "screenshots/"]
 wgpu = "0.18"
 bytemuck = { version = "1.13", features = ["extern_crate_alloc"] }
 half = { version = "2.2", features = ["bytemuck"] }
-safetensors = "0.4.1"
+safetensors = "0.4"
 flume = "0.11.0"
-regex = "1.8.4"
+regex = "1.10"
 gpp = "0.6.2"
 uid = "0.1"
 ahash = "0.8"
diff --git a/src/model/mod.rs b/src/model/mod.rs
index e2c4115..93fe988 100644
--- a/src/model/mod.rs
+++ b/src/model/mod.rs
@@ -134,7 +134,11 @@ pub trait FromBuilder: Sized {
     fn from_builder(builder: Self::Builder<'_>) -> Result<Self, Self::Error>;
 }
 
-pub trait BackedState: for<'a> FromBuilder<Builder<'a> = StateBuilder, Error = Infallible> {
+pub trait BackedState:
+    Serialize
+    + for<'a> Deserialize<'a>
+    + for<'a> FromBuilder<Builder<'a> = StateBuilder, Error = Infallible>
+{
     fn num_batch(&self) -> usize;
     fn num_layer(&self) -> usize;
 
diff --git a/src/model/v4.rs b/src/model/v4.rs
index 266e891..61587e3 100644
--- a/src/model/v4.rs
+++ b/src/model/v4.rs
@@ -341,7 +341,7 @@ impl super::ModelState for ModelState {
     }
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BackedState {
     pub shape: Shape,
     pub data: Vec<f32>,
diff --git a/src/model/v5.rs b/src/model/v5.rs
index 8e9887b..c81495f 100644
--- a/src/model/v5.rs
+++ b/src/model/v5.rs
@@ -400,7 +400,7 @@ impl super::ModelState for ModelState {
     }
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BackedState {
     pub num_batch: usize,
     pub chunk_size: usize,
diff --git a/src/model/v6.rs b/src/model/v6.rs
index 18751ff..6bd7961 100644
--- a/src/model/v6.rs
+++ b/src/model/v6.rs
@@ -441,7 +441,7 @@ impl super::ModelState for ModelState {
     }
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BackedState {
     pub num_batch: usize,
     pub chunk_size: usize,