diff --git a/crates/caldav/src/lib.rs b/crates/caldav/src/lib.rs
index 72e5071..d527551 100644
--- a/crates/caldav/src/lib.rs
+++ b/crates/caldav/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 use axum::{Extension, Router};
 use derive_more::Constructor;
 use principal::PrincipalResourceService;
diff --git a/crates/carddav/src/lib.rs b/crates/carddav/src/lib.rs
index 1cb8f54..ce87be6 100644
--- a/crates/carddav/src/lib.rs
+++ b/crates/carddav/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 use axum::response::Redirect;
 use axum::routing::any;
 use axum::{Extension, Router};
diff --git a/crates/dav/src/lib.rs b/crates/dav/src/lib.rs
index e23d682..3d2c179 100644
--- a/crates/dav/src/lib.rs
+++ b/crates/dav/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 pub mod error;
 pub mod extensions;
 pub mod header;
diff --git a/crates/dav_push/src/lib.rs b/crates/dav_push/src/lib.rs
index e27b394..835c530 100644
--- a/crates/dav_push/src/lib.rs
+++ b/crates/dav_push/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 mod extension;
 mod prop;
 pub mod register;
diff --git a/crates/frontend/src/lib.rs b/crates/frontend/src/lib.rs
index 8486500..c16a58d 100644
--- a/crates/frontend/src/lib.rs
+++ b/crates/frontend/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 use axum::{
     Extension, RequestExt, Router,
     body::Body,
diff --git a/crates/ical/src/lib.rs b/crates/ical/src/lib.rs
index 623c088..a02d1c8 100644
--- a/crates/ical/src/lib.rs
+++ b/crates/ical/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 mod timestamp;
 mod timezone;
 pub use timestamp::*;
diff --git a/crates/oidc/src/lib.rs b/crates/oidc/src/lib.rs
index 0299fd4..b86b463 100644
--- a/crates/oidc/src/lib.rs
+++ b/crates/oidc/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 use axum::{
     Extension, Form,
     extract::Query,
diff --git a/crates/store/src/lib.rs b/crates/store/src/lib.rs
index fb95fec..73ac4d2 100644
--- a/crates/store/src/lib.rs
+++ b/crates/store/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 pub mod addressbook;
 pub mod addressbook_store;
 pub mod calendar_store;
diff --git a/crates/store_sqlite/src/lib.rs b/crates/store_sqlite/src/lib.rs
index 3a911ac..eb0e0c6 100644
--- a/crates/store_sqlite/src/lib.rs
+++ b/crates/store_sqlite/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 pub use error::Error;
 use serde::Serialize;
 use sqlx::{Pool, Sqlite, SqlitePool, sqlite::SqliteConnectOptions};
diff --git a/crates/xml/src/lib.rs b/crates/xml/src/lib.rs
index b28737a..271efc8 100644
--- a/crates/xml/src/lib.rs
+++ b/crates/xml/src/lib.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 use quick_xml::name::Namespace;
 use std::collections::HashMap;
 use std::hash::Hash;
diff --git a/src/main.rs b/src/main.rs
index b5b3a4d..ace4304 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,4 @@
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
 use crate::config::Config;
 use anyhow::Result;
 use app::make_app;