diff --git a/src/app.rs b/src/app.rs
index 7cd4728..6a53942 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -2,12 +2,10 @@ mod components;
 mod retry;
 mod supervise;
 
-use crate::prelude::*;
-
 pub use retry::*;
 pub use supervise::*;
 
-#[async_trait]
+#[async_trait::async_trait]
 pub trait Component {
     type Output;
 
@@ -19,7 +17,7 @@ pub enum Transition<N, D> {
     Done(D),
 }
 
-#[async_trait]
+#[async_trait::async_trait]
 pub trait StateMachine: Sized {
     type Output;
 
@@ -39,7 +37,7 @@ pub async fn run<S: StateMachine>(mut machine: S) -> S::Output {
 mod tests {
     use super::*;
 
-    #[async_trait]
+    #[async_trait::async_trait]
     impl StateMachine for u32 {
         type Output = u32;
 
diff --git a/src/app/components.rs b/src/app/components.rs
index 6b47bca..60dd8b8 100644
--- a/src/app/components.rs
+++ b/src/app/components.rs
@@ -1,68 +1,7 @@
-use crate::exec::*;
-use crate::prelude::*;
+mod cmd_executor;
+mod cmd_not_found;
+mod wait;
 
-#[derive(new)]
-pub struct CmdExecutor {
-    pub command: String,
-    pub executor: Arc<dyn PipedCmdExecutor + Send + Sync>,
-}
-
-#[async_trait]
-impl super::Component for CmdExecutor {
-    type Output = Result<Exit>;
-
-    async fn handle(&self) -> Self::Output {
-        let output = self.executor.piped_exec(self.command.as_str()).await?;
-        Ok(output)
-    }
-}
-
-#[derive(new)]
-pub struct PrintableCmdNotFound<C> {
-    pub command: String,
-    pub inner: C,
-}
-
-#[async_trait]
-impl<T: 'static, C: super::Component<Output = Result<T>> + Send + Sync> super::Component
-    for PrintableCmdNotFound<C>
-{
-    type Output = Result<T>;
-
-    async fn handle(&self) -> Self::Output {
-        let result = self.inner.handle().await;
-
-        match &result {
-            Err(_) => {
-                if self.command.is_empty() {
-                    eprintln!("cx: no command entered")
-                } else {
-                    eprintln!(
-                        "cx: command not found '{}'",
-                        self.command
-                            .split(" ")
-                            .collect::<Vec<_>>()
-                            .get(0)
-                            .unwrap_or(&"")
-                    )
-                }
-            }
-            _ => (),
-        };
-
-        result
-    }
-}
-
-pub struct WaitSec {
-    pub sec: f64,
-}
-
-#[async_trait]
-impl super::Component for WaitSec {
-    type Output = ();
-
-    async fn handle(&self) -> Self::Output {
-        tokio::time::sleep(tokio::time::Duration::from_secs_f64(self.sec)).await
-    }
-}
+pub use cmd_executor::*;
+pub use cmd_not_found::*;
+pub use wait::*;
diff --git a/src/app/components/cmd_executor.rs b/src/app/components/cmd_executor.rs
new file mode 100644
index 0000000..e3f3c8c
--- /dev/null
+++ b/src/app/components/cmd_executor.rs
@@ -0,0 +1,18 @@
+use crate::app::*;
+use crate::exec::*;
+
+#[derive(new)]
+pub struct CmdExecutor {
+    pub command: String,
+    pub executor: std::sync::Arc<dyn PipedCmdExecutor + Send + Sync>,
+}
+
+#[async_trait::async_trait]
+impl Component for CmdExecutor {
+    type Output = anyhow::Result<Exit>;
+
+    async fn handle(&self) -> Self::Output {
+        let output = self.executor.piped_exec(self.command.as_str()).await?;
+        Ok(output)
+    }
+}
diff --git a/src/app/components/cmd_not_found.rs b/src/app/components/cmd_not_found.rs
new file mode 100644
index 0000000..51ff2ff
--- /dev/null
+++ b/src/app/components/cmd_not_found.rs
@@ -0,0 +1,38 @@
+use crate::app::*;
+
+#[derive(new)]
+pub struct PrintableCmdNotFound<C> {
+    pub command: String,
+    pub inner: C,
+}
+
+#[async_trait::async_trait]
+impl<T: 'static, C: Component<Output = anyhow::Result<T>> + Send + Sync> Component
+    for PrintableCmdNotFound<C>
+{
+    type Output = anyhow::Result<T>;
+
+    async fn handle(&self) -> Self::Output {
+        let result = self.inner.handle().await;
+
+        match &result {
+            Err(_) => {
+                if self.command.is_empty() {
+                    eprintln!("cx: no command entered")
+                } else {
+                    eprintln!(
+                        "cx: command not found '{}'",
+                        self.command
+                            .split(" ")
+                            .collect::<Vec<_>>()
+                            .get(0)
+                            .unwrap_or(&"")
+                    )
+                }
+            }
+            _ => (),
+        };
+
+        result
+    }
+}
diff --git a/src/app/components/wait.rs b/src/app/components/wait.rs
new file mode 100644
index 0000000..7c24242
--- /dev/null
+++ b/src/app/components/wait.rs
@@ -0,0 +1,14 @@
+use crate::app::*;
+
+pub struct WaitSec {
+    pub sec: f64,
+}
+
+#[async_trait::async_trait]
+impl Component for WaitSec {
+    type Output = ();
+
+    async fn handle(&self) -> Self::Output {
+        tokio::time::sleep(tokio::time::Duration::from_secs_f64(self.sec)).await
+    }
+}
diff --git a/src/app/retry.rs b/src/app/retry.rs
index 00909e4..73c3224 100644
--- a/src/app/retry.rs
+++ b/src/app/retry.rs
@@ -1,6 +1,5 @@
 use super::{components::*, *};
 use crate::exec::*;
-use crate::prelude::*;
 
 pub enum RetryResult {
     Success,
@@ -17,10 +16,10 @@ pub struct RetryApp<E, S> {
     count: Option<usize>,
 }
 
-#[async_trait]
+#[async_trait::async_trait]
 impl<E, S> StateMachine for RetryApp<E, S>
 where
-    E: Component<Output = Result<Exit>> + Into<S> + Send + Sync,
+    E: Component<Output = anyhow::Result<Exit>> + Into<S> + Send + Sync,
     S: Component<Output = ()> + Into<E> + Send + Sync,
 {
     type Output = RetryResult;
@@ -56,11 +55,11 @@ where
 pub struct SharedParams<C> {
     command: String,
     interval: f64,
-    executor: Arc<dyn PipedCmdExecutor + Send + Sync>,
+    executor: std::sync::Arc<dyn PipedCmdExecutor + Send + Sync>,
     inner: C,
 }
 
-#[async_trait]
+#[async_trait::async_trait]
 impl<T: 'static, C: Component<Output = T> + Send + Sync> Component for SharedParams<C> {
     type Output = T;
 
@@ -101,7 +100,7 @@ impl From<SharedParams<WaitSec>> for SharedParams<PrintableCmdNotFound<CmdExecut
 
 impl RetryApp<SharedParams<PrintableCmdNotFound<CmdExecutor>>, SharedParams<WaitSec>> {
     pub fn new(command: String, count: Option<usize>, interval: f64) -> Self {
-        let executor = Arc::new(tokio_impl::TokioPipedCmdExecutor);
+        let executor = std::sync::Arc::new(tokio_impl::TokioPipedCmdExecutor);
 
         Self {
             state: State::ExecuteCommand(SharedParams::new(
@@ -120,12 +119,12 @@ mod tests {
     use super::*;
 
     struct TestE {
-        output: Box<dyn Fn() -> Result<Exit> + Send + Sync>,
+        output: Box<dyn Fn() -> anyhow::Result<Exit> + Send + Sync>,
     }
 
-    #[async_trait]
+    #[async_trait::async_trait]
     impl Component for TestE {
-        type Output = Result<Exit>;
+        type Output = anyhow::Result<Exit>;
         async fn handle(&self) -> Self::Output {
             (*self.output)()
         }
@@ -133,7 +132,7 @@ mod tests {
 
     struct TestS;
 
-    #[async_trait]
+    #[async_trait::async_trait]
     impl Component for TestS {
         type Output = ();
         async fn handle(&self) -> Self::Output {
diff --git a/src/app/supervise.rs b/src/app/supervise.rs
index d9a4517..3b53db9 100644
--- a/src/app/supervise.rs
+++ b/src/app/supervise.rs
@@ -1,6 +1,5 @@
 use super::{components::*, *};
 use crate::exec::*;
-use crate::prelude::*;
 
 enum State<E, S> {
     ExecuteCommand(E),
@@ -12,10 +11,10 @@ pub struct SuperviseApp<E, S> {
     count: Option<usize>,
 }
 
-#[async_trait]
+#[async_trait::async_trait]
 impl<E, S> StateMachine for SuperviseApp<E, S>
 where
-    E: Component<Output = Result<Exit>> + Into<S> + Send + Sync,
+    E: Component<Output = anyhow::Result<Exit>> + Into<S> + Send + Sync,
     S: Component<Output = ()> + Into<E> + Send + Sync,
 {
     type Output = ();
@@ -51,11 +50,11 @@ where
 pub struct SharedParams<C> {
     command: String,
     interval: f64,
-    executor: Arc<dyn PipedCmdExecutor + Send + Sync>,
+    executor: std::sync::Arc<dyn PipedCmdExecutor + Send + Sync>,
     inner: C,
 }
 
-#[async_trait]
+#[async_trait::async_trait]
 impl<T: 'static, C: Component<Output = T> + Send + Sync> Component for SharedParams<C> {
     type Output = T;
 
@@ -96,7 +95,7 @@ impl From<SharedParams<WaitSec>> for SharedParams<PrintableCmdNotFound<CmdExecut
 
 impl SuperviseApp<SharedParams<PrintableCmdNotFound<CmdExecutor>>, SharedParams<WaitSec>> {
     pub fn new(command: String, count: Option<usize>, interval: f64) -> Self {
-        let executor = Arc::new(tokio_impl::TokioPipedCmdExecutor);
+        let executor = std::sync::Arc::new(tokio_impl::TokioPipedCmdExecutor);
 
         Self {
             state: State::ExecuteCommand(SharedParams::new(
@@ -116,9 +115,9 @@ mod tests {
 
     struct TestE;
 
-    #[async_trait]
+    #[async_trait::async_trait]
     impl Component for TestE {
-        type Output = Result<Exit>;
+        type Output = anyhow::Result<Exit>;
         async fn handle(&self) -> Self::Output {
             Ok(Exit::new(0))
         }
@@ -126,7 +125,7 @@ mod tests {
 
     struct TestS;
 
-    #[async_trait]
+    #[async_trait::async_trait]
     impl Component for TestS {
         type Output = ();
         async fn handle(&self) -> Self::Output {
diff --git a/src/main.rs b/src/main.rs
index ad5bfef..699a304 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,15 +23,15 @@ extern crate derive_new;
 mod app;
 mod config;
 mod exec;
-mod prelude;
 
 use app::*;
 use config::*;
-use prelude::*;
-use structopt::StructOpt;
 
 #[tokio::main]
 async fn main() {
+    use futures::{future::Either, FutureExt};
+    use structopt::StructOpt;
+
     let config = Config::from_args();
 
     let state_machine = match config {
diff --git a/src/prelude.rs b/src/prelude.rs
deleted file mode 100644
index c53e269..0000000
--- a/src/prelude.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub use anyhow::*;
-pub use async_trait::*;
-pub use futures::{future::Either, FutureExt};
-pub use std::sync::Arc;