diff --git a/README.md b/README.md
index 62ab1f6..7dca620 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,152 @@
 # Phomnemic
 
+A phonemic encoding/decoding system with dictionary management and REST API.
+
+## Configure and Run
+
+### Prerequisites
+
+- Rust 1.70 or later
+- SQLite (for local database)
+- Firebase Auth (optional, for JWT authentication)
+
+### Installation
+
+```bash
+cargo build --release
+```
+
+### Configuration
+
+Create a `config.toml` file in the project root:
+
+```toml
+[listen]
+host = "0.0.0.0"
+port = 3000
+
+log_level = "info"
+
+[auth]
+firebase_project_id = "your-firebase-project-id"
+firebase_emulator_url = "http://localhost:9099"
+api_tokens = ["your-api-key-1", "your-api-key-2"]
+
+[database]
+url = "sqlite:app.db"
+```
+
+#### Authentication Options
+
+The application supports two authentication methods:
+
+1. **Firebase JWT Authentication** (for frontend clients)
+   - Set `firebase_project_id` to your Firebase project ID
+   - Or use `firebase_emulator_url` for local development with Firebase Auth Emulator
+
+2. **API Key Authentication** (for server-to-server or CLI access)
+   - Add valid API keys to the `api_tokens` array
+   - Send requests with `X-API-Key` header containing your API key
+
+### Running with Firebase Auth Emulator
+
+1. Start the Firebase Auth Emulator:
+   ```bash
+   firebase emulators:start --only auth
+   ```
+   The emulator runs on port 9099 by default.
+
+2. Configure the application to use the emulator:
+   ```toml
+   [auth]
+   firebase_emulator_url = "http://localhost:9099"
+   api_tokens = ["dev-api-key"]
+   ```
+
+3. Get a test token from the emulator:
+   ```bash
+   # Using curl
+   curl -X POST "http://localhost:9099/identitytoolkit.googleapis.com/v1/accounts:signInWithPassword?key=fake-api-key" \
+     -H "Content-Type: application/json" \
+     -d '{
+       "email": "test@example.com",
+       "password": "password",
+       "returnSecureToken": true
+     }'
+   ```
+
+4. Make authenticated requests:
+   ```bash
+   curl -X GET "http://localhost:3000/api/v1/health" \
+     -H "Authorization: Bearer <your-firebase-token>"
+   ```
+
+### Running with API Keys
+
+1. Configure API keys in `config.toml`:
+   ```toml
+   [auth]
+   api_tokens = ["my-secret-api-key"]
+   ```
+
+2. Make authenticated requests:
+   ```bash
+   curl -X GET "http://localhost:3000/api/v1/health" \
+     -H "X-API-Key: my-secret-api-key"
+   ```
+
+### Starting the Server
+
+```bash
+cargo run --release -- listen
+```
+
+Or with custom options:
+
+```bash
+cargo run --release -- listen --host 127.0.0.1 --port 8080
+```
+
+### API Endpoints
+
+#### Health Check
+```bash
+GET /api/v1/health
+```
+
+#### Dictionary Management
+```bash
+GET /api/v1/dicts
+GET /api/v1/dicts/:name
+```
+
+#### Major System Encoding/Decoding
+```bash
+POST /api/v1/major/encode
+POST /api/v1/major/decode
+```
+
+#### Authentication
+```bash
+POST /api/v1/auth/login
+```
+
+### Development
+
+Run in development mode with auto-reload:
+
+```bash
+cargo run -- listen
+```
+
+### Testing
+
+Run tests:
+
+```bash
+cargo test
+```
+
+### License
+
+MIT
diff --git a/apps/app_api/config.toml.example b/apps/app_api/config.toml.example
index 0309283..8560164 100644
--- a/apps/app_api/config.toml.example
+++ b/apps/app_api/config.toml.example
@@ -2,4 +2,12 @@
 host = "0.0.0.0"
 port = 3000
 
-log_level = "info"
\ No newline at end of file
+log_level = "info"
+
+[auth]
+firebase_project_id = "your-firebase-project-id"
+firebase_emulator_url = "http://localhost:9099"
+api_tokens = ["your-api-key-1", "your-api-key-2"]
+
+[database]
+url = "sqlite:app.db"
\ No newline at end of file
diff --git a/apps/app_api/src/api.rs b/apps/app_api/src/api.rs
index 4370f79..18c3dff 100644
--- a/apps/app_api/src/api.rs
+++ b/apps/app_api/src/api.rs
@@ -4,6 +4,6 @@ use crate::state::AppState;
 use axum::Router;
 use std::sync::Arc;
 
-pub fn routes() -> Router<Arc<AppState>> {
-    Router::new().nest("/api/v1", v1::routes())
+pub fn routes(state: Arc<AppState>) -> Router<Arc<AppState>> {
+    Router::new().nest("/api/v1", v1::routes(state))
 }
diff --git a/apps/app_api/src/api/v1.rs b/apps/app_api/src/api/v1.rs
index 032d2f2..33690bf 100644
--- a/apps/app_api/src/api/v1.rs
+++ b/apps/app_api/src/api/v1.rs
@@ -4,13 +4,60 @@ pub mod health;
 pub mod major;
 
 use crate::state::AppState;
-use axum::Router;
+use axum::{
+    Router, extract::Request, extract::State, http::StatusCode, middleware::Next,
+    response::Response,
+};
 use std::sync::Arc;
 
-pub fn routes() -> Router<Arc<AppState>> {
+pub fn routes(state: Arc<AppState>) -> Router<Arc<AppState>> {
     Router::new()
         .nest("/health", health::routes())
+        .nest("/auth", auth::routes())
         .nest("/dicts", dictionary::routes())
         .nest("/major", major::routes())
-        .nest("/auth", auth::routes())
+        .route_layer(axum::middleware::from_fn_with_state(
+            state,
+            |state: State<Arc<AppState>>, request: Request, next: Next| async move {
+                auth_middleware_inner(state, request, next).await
+            },
+        ))
+}
+
+async fn auth_middleware_inner(
+    state: State<Arc<AppState>>,
+    mut request: Request,
+    next: Next,
+) -> Response {
+    let auth_header = request
+        .headers()
+        .get("Authorization")
+        .and_then(|h| h.to_str().ok());
+
+    let api_key_header = request
+        .headers()
+        .get("X-API-Key")
+        .and_then(|h| h.to_str().ok());
+
+    let token = if let Some(header) = auth_header {
+        header.to_string()
+    } else if let Some(key) = api_key_header {
+        key.to_string()
+    } else {
+        return Response::builder()
+            .status(StatusCode::UNAUTHORIZED)
+            .body("Missing authorization header or API key".into())
+            .unwrap();
+    };
+
+    match state.0.dependencies.auth_service.authenticate(&token).await {
+        Ok(claims) => {
+            request.extensions_mut().insert(claims);
+            next.run(request).await
+        }
+        Err(_) => Response::builder()
+            .status(StatusCode::UNAUTHORIZED)
+            .body("Unauthorized".into())
+            .unwrap(),
+    }
 }
diff --git a/apps/app_api/src/commands/listen.rs b/apps/app_api/src/commands/listen.rs
index 128a481..2ee2262 100644
--- a/apps/app_api/src/commands/listen.rs
+++ b/apps/app_api/src/commands/listen.rs
@@ -31,6 +31,7 @@ impl Configurable for ListenCmd {
         builder: ConfigBuilder<DefaultState>,
     ) -> Result<ConfigBuilder<DefaultState>> {
         builder
+            .set_default("log_level", defaults::LOG_LEVEL)?
             .set_default("listen.host", defaults::LISTEN_HOST)?
             .set_default("listen.port", defaults::LISTEN_PORT)
             .map_err(Into::into)
@@ -60,12 +61,13 @@ impl Executable for ListenCmd {
             .as_ref()
             .ok_or_else(|| anyhow::anyhow!("Listen config missing"))?;
 
-        let app = router::create_router().await?;
+        let app = router::create_router(config).await?;
         let addr = format!("{}:{}", listen_config.host, listen_config.port);
         let listener = TcpListener::bind(&addr).await?;
 
         info!("Starting server on {}", addr);
 
+        // axum::serve(listener, app.into_make_service()).await?;
         axum::serve(listener, app)
             .with_graceful_shutdown(shutdown_signal())
             .await?;
@@ -103,6 +105,7 @@ async fn shutdown_signal() {
 
 mod defaults {
     use const_format::formatcp;
+    pub const LOG_LEVEL: &str = "info";
     pub const LISTEN_HOST: &str = "0.0.0.0";
     pub const LISTEN_PORT: u16 = 3000;
     pub const HELP_LISTEN_HOST: &str = formatcp!("Host address [default: {}]", LISTEN_HOST);
diff --git a/apps/app_api/src/config/auth.rs b/apps/app_api/src/config/auth.rs
index 4ca0721..dee2101 100644
--- a/apps/app_api/src/config/auth.rs
+++ b/apps/app_api/src/config/auth.rs
@@ -3,6 +3,7 @@ use serde::Deserialize;
 #[derive(Debug, Deserialize, Clone)]
 pub struct AuthConfig {
     pub firebase_project_id: Option<String>,
+    pub firebase_emulator_url: Option<String>,
     pub api_tokens: Vec<String>,
 }
 
@@ -10,6 +11,7 @@ impl Default for AuthConfig {
     fn default() -> Self {
         Self {
             firebase_project_id: None,
+            firebase_emulator_url: None,
             api_tokens: Vec::new(),
         }
     }
diff --git a/apps/app_api/src/dependencies.rs b/apps/app_api/src/dependencies.rs
index b80c6d4..ee9262b 100644
--- a/apps/app_api/src/dependencies.rs
+++ b/apps/app_api/src/dependencies.rs
@@ -18,18 +18,23 @@ impl AppDependencies {
     pub async fn new(
         database_url: &str,
         firebase_project_id: Option<String>,
+        firebase_emulator_url: Option<String>,
+        api_tokens: Vec<String>,
     ) -> anyhow::Result<Self> {
         let repo_factory = Arc::new(SqliteDictRepository::new(database_url).await?);
 
         let dictionary_service = Arc::new(DictionaryService::new(repo_factory.clone()));
 
-        let jwt_auth: Arc<dyn Authenticator> = if let Some(project_id) = firebase_project_id {
+        let jwt_auth: Arc<dyn Authenticator> = if let Some(emulator_url) = firebase_emulator_url {
+            Arc::new(JwtAuthenticator::with_emulator(emulator_url))
+        } else if let Some(project_id) = firebase_project_id {
             Arc::new(JwtAuthenticator::new(project_id))
         } else {
             Arc::new(JwtAuthenticator::with_placeholder())
         };
 
-        let api_token_auth: Arc<dyn Authenticator> = Arc::new(ApiTokenAuthenticator::new());
+        let api_token_authenticator = ApiTokenAuthenticator::with_tokens(api_tokens);
+        let api_token_auth: Arc<dyn Authenticator> = Arc::new(api_token_authenticator);
         let token_store: Arc<dyn TokenStore> = Arc::new(InMemoryTokenStore::new());
 
         let auth_service = Arc::new(AuthService::new(jwt_auth, api_token_auth, token_store));
diff --git a/apps/app_api/src/error.rs b/apps/app_api/src/error.rs
index 2044e65..95e1884 100644
--- a/apps/app_api/src/error.rs
+++ b/apps/app_api/src/error.rs
@@ -34,7 +34,6 @@ impl ErrorResponse {
 
 impl From<ServiceError> for ErrorResponse {
     fn from(err: ServiceError) -> Self {
-        let message = err.to_string();
         match &err {
             ServiceError::Repository(e) => ErrorResponse {
                 error: "Repository error".to_string(),
diff --git a/apps/app_api/src/main.rs b/apps/app_api/src/main.rs
index d0596e4..cf28f90 100644
--- a/apps/app_api/src/main.rs
+++ b/apps/app_api/src/main.rs
@@ -4,7 +4,6 @@ mod commands;
 mod config;
 mod dependencies;
 mod error;
-mod middleware;
 mod router;
 mod state;
 
diff --git a/apps/app_api/src/middleware.rs b/apps/app_api/src/middleware.rs
deleted file mode 100644
index 27e516a..0000000
--- a/apps/app_api/src/middleware.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-pub mod auth;
-
-use crate::state::AppState;
-use axum::{
-    extract::{Request, State},
-    middleware::Next,
-    response::Response,
-};
-use std::sync::Arc;
-
-pub async fn auth_middleware(
-    State(state): State<Arc<AppState>>,
-    mut request: Request,
-    next: Next,
-) -> Result<Response, Response> {
-    let auth_header = request
-        .headers()
-        .get("Authorization")
-        .and_then(|h| h.to_str().ok());
-
-    if let Some(token) = auth_header {
-        match state.dependencies.auth_service.authenticate(token).await {
-            Ok(claims) => {
-                request.extensions_mut().insert(claims);
-                Ok(next.run(request).await)
-            }
-            Err(_) => Err(Response::builder()
-                .status(401)
-                .body("Unauthorized".into())
-                .unwrap()),
-        }
-    } else {
-        Err(Response::builder()
-            .status(401)
-            .body("Missing authorization header".into())
-            .unwrap())
-    }
-}
diff --git a/apps/app_api/src/middleware/auth.rs b/apps/app_api/src/middleware/auth.rs
deleted file mode 100644
index 4b0611a..0000000
--- a/apps/app_api/src/middleware/auth.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-use axum::http::HeaderMap;
-
-pub fn extract_token(headers: &HeaderMap) -> Option<String> {
-    headers
-        .get("Authorization")
-        .and_then(|h| h.to_str().ok())
-        .map(|s| s.to_string())
-}
diff --git a/apps/app_api/src/router.rs b/apps/app_api/src/router.rs
index eb1fbc3..f85c596 100644
--- a/apps/app_api/src/router.rs
+++ b/apps/app_api/src/router.rs
@@ -1,16 +1,25 @@
-use axum::Router;
 use std::sync::Arc;
 use tower_http::{cors::CorsLayer, trace::TraceLayer};
 
 use crate::api;
+use crate::config::AppConfig;
 use crate::dependencies::AppDependencies;
 use crate::state::AppState;
 
-pub async fn create_router() -> anyhow::Result<Router> {
-    let dependencies = AppDependencies::new("sqlite:app.db", None).await?;
+pub async fn create_router(config: &AppConfig) -> anyhow::Result<axum::Router> {
+    let database_url = &config.database.url;
+
+    let dependencies = AppDependencies::new(
+        database_url,
+        config.auth.firebase_project_id.clone(),
+        config.auth.firebase_emulator_url.clone(),
+        config.auth.api_tokens.clone(),
+    )
+    .await?;
+
     let state = Arc::new(AppState::new(dependencies).await);
 
-    Ok(api::routes()
+    Ok(api::routes(state.clone())
         .with_state(state)
         .layer(TraceLayer::new_for_http())
         .layer(CorsLayer::permissive()))
diff --git a/config.toml b/config.toml
index e8b4036..13e61f8 100644
--- a/config.toml
+++ b/config.toml
@@ -1 +1,13 @@
-log_level = "info"
+[listen]
+host = "0.0.0.0"
+port = 3000
+
+log_level = "trace"
+
+[auth]
+firebase_project_id = "test-project"
+firebase_emulator_url = "http://192.168.1.23:9099"
+api_tokens = ["dev-api-key"]
+
+[database]
+url = "sqlite:app.db"
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index a62f2e5..27487b7 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -19,6 +19,8 @@ async-trait = "0.1"
 parking_lot = "0.12"
 sqlx = { version = "0.8.6", features = ["runtime-tokio", "sqlite", "chrono", "migrate"] }
 futures = "0.3.31"
+jsonwebtoken = "9.3"
+reqwest = { version = "0.12", features = ["json"] }
 
 [dev-dependencies]
 mockall = "0.14.0"
diff --git a/lib/src/auth/infrastructure/jwt.rs b/lib/src/auth/infrastructure/jwt.rs
index 599820f..c70488c 100644
--- a/lib/src/auth/infrastructure/jwt.rs
+++ b/lib/src/auth/infrastructure/jwt.rs
@@ -1,22 +1,153 @@
 use crate::auth::domain::AuthClaims;
 use crate::auth::traits::Authenticator;
 use crate::common::errors::AuthError;
+use jsonwebtoken::{
+    Algorithm, DecodingKey, Validation, dangerous_insecure_decode, decode, decode_header,
+};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::sync::Arc;
+use std::time::Duration;
+use tokio::sync::RwLock;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+struct FirebaseClaims {
+    iss: String,
+    aud: String,
+    auth_time: i64,
+    user_id: String,
+    sub: String,
+    iat: i64,
+    exp: i64,
+    email: Option<String>,
+    email_verified: Option<bool>,
+    firebase: Option<FirebaseData>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+struct FirebaseData {
+    identities: Option<serde_json::Value>,
+    sign_in_provider: Option<String>,
+    tenant: Option<String>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+struct PublicKey {
+    n: String,
+    e: String,
+    kid: String,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+struct JwksResponse {
+    keys: Vec<PublicKey>,
+}
+
+#[derive(Clone)]
+struct KeyCache {
+    keys: HashMap<String, DecodingKey>,
+    expires_at: i64,
+}
 
 pub struct JwtAuthenticator {
     firebase_project_id: String,
+    issuer: String,
+    audience: String,
+    emulator_url: Option<String>,
+    key_cache: Arc<RwLock<Option<KeyCache>>>,
 }
 
 impl JwtAuthenticator {
     pub fn new(firebase_project_id: impl Into<String>) -> Self {
+        let project_id = firebase_project_id.into();
+        let issuer = format!("https://securetoken.google.com/{}", project_id);
+        Self {
+            firebase_project_id: project_id.clone(),
+            issuer,
+            audience: project_id,
+            emulator_url: None,
+            key_cache: Arc::new(RwLock::new(None)),
+        }
+    }
+
+    pub fn with_emulator(emulator_url: impl Into<String>) -> Self {
         Self {
-            firebase_project_id: firebase_project_id.into(),
+            firebase_project_id: "emulator".to_string(),
+            issuer: "https://securetoken.google.com/emulator".to_string(),
+            audience: "emulator".to_string(),
+            emulator_url: Some(emulator_url.into()),
+            key_cache: Arc::new(RwLock::new(None)),
         }
     }
 
     pub fn with_placeholder() -> Self {
         Self {
             firebase_project_id: "FIREBASE_PROJECT_ID_PLACEHOLDER".to_string(),
+            issuer: "https://securetoken.google.com/FIREBASE_PROJECT_ID_PLACEHOLDER".to_string(),
+            audience: "FIREBASE_PROJECT_ID_PLACEHOLDER".to_string(),
+            emulator_url: None,
+            key_cache: Arc::new(RwLock::new(None)),
+        }
+    }
+
+    async fn get_public_keys(&self) -> Result<HashMap<String, DecodingKey>, AuthError> {
+        let cache = self.key_cache.read().await;
+        if let Some(ref cached) = *cache {
+            let now = chrono::Utc::now().timestamp();
+            if cached.expires_at > now {
+                return Ok(cached.keys.clone());
+            }
+        }
+        drop(cache);
+
+        let url = if let Some(ref emulator) = self.emulator_url {
+            format!("{}/.well-known/jwks.json", emulator.trim_end_matches('/'))
+        } else {
+            format!(
+                "https://www.googleapis.com/robot/v1/metadata/x509/securetoken@system.gserviceaccount.com"
+            )
+        };
+
+        let client = reqwest::Client::builder()
+            .timeout(Duration::from_secs(10))
+            .build()
+            .map_err(|e| {
+                AuthError::AuthenticationFailed(format!("Failed to build HTTP client: {}", e))
+            })?;
+
+        let response = client.get(&url).send().await.map_err(|e| {
+            AuthError::AuthenticationFailed(format!("Failed to fetch public keys: {}", e))
+        })?;
+
+        if !response.status().is_success() {
+            return Err(AuthError::AuthenticationFailed(format!(
+                "Failed to fetch public keys: HTTP {}",
+                response.status()
+            )));
+        }
+
+        let body = response.text().await.map_err(|e| {
+            AuthError::AuthenticationFailed(format!("Failed to read response: {}", e))
+        })?;
+
+        let jwks: JwksResponse = serde_json::from_str(&body)
+            .map_err(|e| AuthError::AuthenticationFailed(format!("Failed to parse JWKS: {}", e)))?;
+
+        let mut keys = HashMap::new();
+        for key in jwks.keys {
+            let decoding_key = DecodingKey::from_rsa_components(&key.n, &key.e).map_err(|e| {
+                AuthError::AuthenticationFailed(format!("Failed to create decoding key: {}", e))
+            })?;
+            keys.insert(key.kid, decoding_key);
         }
+
+        let expires_at = chrono::Utc::now().timestamp() + 3600;
+        let new_cache = KeyCache { keys, expires_at };
+
+        let mut cache = self.key_cache.write().await;
+        *cache = Some(new_cache);
+
+        Ok(cache.as_ref().unwrap().keys.clone())
     }
 }
 
@@ -29,40 +160,53 @@ impl Authenticator for JwtAuthenticator {
             ));
         }
 
-        let parts: Vec<&str> = token.split('.').collect();
-        if parts.len() != 3 {
-            return Err(AuthError::InvalidToken);
-        }
+        let header = decode_header(token).map_err(|e| {
+            tracing::debug!("Failed to decode header: {}", e.to_string());
+            AuthError::InvalidToken
+        })?;
 
-        let claims = AuthClaims::new("firebase_user_123")
-            .with_email("user@example.com")
-            .with_role("user");
+        let kid = header
+            .kid
+            .ok_or_else(|| AuthError::AuthenticationFailed("Token missing key ID".to_string()))?;
 
-        Ok(claims)
-    }
-}
+        let public_keys = self.get_public_keys().await?;
+        let decoding_key = public_keys
+            .get(&kid)
+            .ok_or_else(|| AuthError::AuthenticationFailed("Unknown key ID".to_string()))?;
 
-pub struct JwtConfig {
-    pub firebase_project_id: String,
-    pub issuer: String,
-    pub audience: String,
-}
+        let mut validation = Validation::new(Algorithm::RS256);
+        validation.set_audience(&[&self.audience]);
+        validation.set_issuer(&[&self.issuer]);
+        validation.validate_exp = true;
 
-impl JwtConfig {
-    pub fn new(firebase_project_id: String) -> Self {
-        let issuer = format!("https://securetoken.google.com/{}", firebase_project_id);
-        Self {
-            firebase_project_id: firebase_project_id.clone(),
-            issuer,
-            audience: firebase_project_id,
+        let token_data =
+            decode::<FirebaseClaims>(token, decoding_key, &validation).map_err(|e| {
+                AuthError::AuthenticationFailed(format!("Token validation failed: {}", e))
+            })?;
+
+        let mut claims = AuthClaims::new(token_data.claims.user_id)
+            .with_expiration(token_data.claims.exp)
+            .with_iat(token_data.claims.iat);
+
+        if let Some(email) = token_data.claims.email {
+            claims = claims.with_email(email);
         }
-    }
 
-    pub fn placeholder() -> Self {
-        Self {
-            firebase_project_id: "FIREBASE_PROJECT_ID_PLACEHOLDER".to_string(),
-            issuer: "https://securetoken.google.com/FIREBASE_PROJECT_ID_PLACEHOLDER".to_string(),
-            audience: "FIREBASE_PROJECT_ID_PLACEHOLDER".to_string(),
+        if let Some(ref firebase) = token_data.claims.firebase {
+            if let Some(ref provider) = firebase.sign_in_provider {
+                claims = claims.with_role(format!("auth:{}", provider));
+            }
         }
+
+        claims = claims.with_role("authenticated");
+
+        Ok(claims)
+    }
+}
+
+impl AuthClaims {
+    pub fn with_iat(mut self, iat: i64) -> Self {
+        self.iat = iat;
+        self
     }
 }
diff --git a/lib/src/common.rs b/lib/src/common.rs
index fd7d794..52acd32 100644
--- a/lib/src/common.rs
+++ b/lib/src/common.rs
@@ -2,6 +2,5 @@ pub mod entities;
 pub mod errors;
 pub mod traits;
 
-pub use self::errors::{AuthError, ServiceError};
 pub use self::traits::SystemDecoder;
 pub use self::traits::SystemEncoder;
diff --git a/lib/src/dictionary/infrastructure/sqlite_dict_repository.rs b/lib/src/dictionary/infrastructure/sqlite_dict_repository.rs
index 124e272..c75bc0c 100644
--- a/lib/src/dictionary/infrastructure/sqlite_dict_repository.rs
+++ b/lib/src/dictionary/infrastructure/sqlite_dict_repository.rs
@@ -6,7 +6,6 @@ use futures::stream::BoxStream;
 use sqlx::{Row, SqlitePool, sqlite::SqliteConnectOptions};
 use std::collections::HashMap;
 use std::str::FromStr;
-use std::sync::Arc;
 
 #[derive(sqlx::FromRow)]
 struct SqliteEntryDto {
@@ -250,7 +249,7 @@ impl DictRepository for SqliteDictRepository {
 #[async_trait::async_trait]
 impl DictRepositoryFactory for SqliteDictRepository {
     async fn create(&self, dict_name: &str) -> Result<Box<dyn DictRepository>, RepositoryError> {
-        let mut repo = Self {
+        let repo = Self {
             pool: self.pool.clone(),
             dict_name: dict_name.to_string(),
         };