diff --git a/crates/syn2mas/src/mas_writer/mod.rs b/crates/syn2mas/src/mas_writer/mod.rs
index 865bf02fe..fe52e0eed 100644
--- a/crates/syn2mas/src/mas_writer/mod.rs
+++ b/crates/syn2mas/src/mas_writer/mod.rs
@@ -46,7 +46,7 @@ pub enum Error {
     },
 
     #[error("writer connection pool shut down due to error")]
-    #[allow(clippy::enum_variant_names)]
+    #[expect(clippy::enum_variant_names)]
     WriterConnectionPoolError,
 
     #[error("inconsistent database: {0}")]
@@ -390,7 +390,6 @@ impl MasWriter {
     /// Errors are returned in the following conditions:
     ///
     /// - If the database connection experiences an error.
-    #[allow(clippy::missing_panics_doc)] // not real
     #[tracing::instrument(name = "syn2mas.mas_writer.new", skip_all)]
     pub async fn new(
         mut conn: LockedMasDatabase,
@@ -632,7 +631,6 @@ impl MasWriter {
     /// Errors are returned in the following conditions:
     ///
     /// - If the database writer connection pool had an error.
-    #[allow(clippy::missing_panics_doc)] // not a real panic
     #[tracing::instrument(skip_all, level = Level::DEBUG)]
     pub fn write_users(&mut self, users: Vec<MasNewUser>) -> BoxFuture<'_, Result<(), Error>> {
         self.writer_pool
@@ -711,7 +709,6 @@ impl MasWriter {
     /// Errors are returned in the following conditions:
     ///
     /// - If the database writer connection pool had an error.
-    #[allow(clippy::missing_panics_doc)] // not a real panic
     #[tracing::instrument(skip_all, level = Level::DEBUG)]
     pub fn write_passwords(
         &mut self,
diff --git a/crates/syn2mas/src/migration.rs b/crates/syn2mas/src/migration.rs
index 37612d1d3..6d0420077 100644
--- a/crates/syn2mas/src/migration.rs
+++ b/crates/syn2mas/src/migration.rs
@@ -140,7 +140,7 @@ struct MigrationState {
 ///
 /// - An underlying database access error, either to MAS or to Synapse.
 /// - Invalid data in the Synapse database.
-#[allow(clippy::implicit_hasher)]
+#[expect(clippy::implicit_hasher)]
 pub async fn migrate(
     mut synapse: SynapseReader<'_>,
     mas: MasWriter,
diff --git a/crates/syn2mas/src/synapse_reader/config.rs b/crates/syn2mas/src/synapse_reader/config.rs
index 2c413a1b9..789be6845 100644
--- a/crates/syn2mas/src/synapse_reader/config.rs
+++ b/crates/syn2mas/src/synapse_reader/config.rs
@@ -16,7 +16,7 @@ use sqlx::postgres::PgConnectOptions;
 ///
 /// See: <https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html>
 #[derive(Deserialize)]
-#[allow(clippy::struct_excessive_bools)]
+#[expect(clippy::struct_excessive_bools)]
 pub struct Config {
     pub database: DatabaseSection,
 
@@ -239,7 +239,7 @@ mod test {
     #[test]
     fn test_to_sqlx_postgres() {
         #[track_caller]
-        #[allow(clippy::needless_pass_by_value)]
+        #[expect(clippy::needless_pass_by_value)]
         fn assert_eq_options(config: DatabaseSection, uri: &str) {
             let config_connect_options = config
                 .to_sqlx_postgres()