diff --git a/Cargo.toml b/Cargo.toml
index 5589e58..8869f94 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "actix-casbin"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Eason Chai <hackerchai.com@gmail.com>","Cheng JIANG <jiang.cheng@vip.163.com>"]
 edition = "2018"
 license = "Apache-2.0"
@@ -15,6 +15,7 @@ path = "src/lib.rs"
 [dependencies]
 actix =  "0.9.0"
 casbin = { version = "1.1.2", default-features = false, features = [ "incremental" ] }
+actix-casbin-auth = {version = "0.3.1", default-features = false }
 tokio = { version = "0.2.21", default-features = false, optional = true }
 async-std = { version = "1.6.2", default-features = false, optional = true }
 futures = "0.3"
@@ -29,4 +30,3 @@ runtime-async-std = ["casbin/runtime-async-std", "async-std/std", "actix-casbin-
 tokio = { version = "0.2.21", features = [ "full" ] }
 async-std = { version = "1.6.2", features = [ "attributes" ] }
 actix-rt = "1.1.1"
-actix-casbin-auth = {version = "0.3.0", default-features = false }
diff --git a/README.md b/README.md
index 00e7a45..1c0b466 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@
 Add it to `Cargo.toml`
 
 ```rust
-actix-casbin = "0.3.0"
+actix-casbin = "0.3.1"
 actix-rt = "1.1.1"
 ```
 
@@ -66,7 +66,7 @@ async fn main() -> Result<()> {
         .await?;
     let a = FileAdapter::new("examples/rbac_policy.csv");
 
-    let casbin_middleware = CasbinService::new(m, a).await;
+    let mut casbin_middleware = CasbinService::new(m, a).await;
     let enforcer = casbin_middleware.get_enforcer().await;
 
     let addr = CasbinActor::<CachedEnforcer>::set_enforcer(enforcer)
diff --git a/tests/test_set_enforcer.rs b/tests/test_set_enforcer.rs
index ba12039..8502309 100644
--- a/tests/test_set_enforcer.rs
+++ b/tests/test_set_enforcer.rs
@@ -9,7 +9,7 @@ async fn test_set_enforcer() {
         .unwrap();
     let a = FileAdapter::new("examples/rbac_policy.csv");
 
-    let casbin_middleware = CasbinService::new(m, a).await;
+    let mut casbin_middleware = CasbinService::new(m, a).await;
     let enforcer = casbin_middleware.get_enforcer().await;
 
     let addr = CasbinActor::<CachedEnforcer>::set_enforcer(enforcer)