diff --git a/crates/caldav/src/calendar/methods/mkcalendar.rs b/crates/caldav/src/calendar/methods/mkcalendar.rs
index b6a9110..ea801df 100644
--- a/crates/caldav/src/calendar/methods/mkcalendar.rs
+++ b/crates/caldav/src/calendar/methods/mkcalendar.rs
@@ -41,7 +41,7 @@ struct MkcalendarRequest {
 }
 
 #[instrument(parent = root_span.id(), skip(store, root_span))]
-pub async fn route_mkcalendar<C: CalendarStore + ?Sized>(
+pub async fn route_mkcalendar<C: CalendarStore>(
     path: Path<(String, String)>,
     body: String,
     user: User,
diff --git a/crates/caldav/src/calendar/methods/post.rs b/crates/caldav/src/calendar/methods/post.rs
index 32749ba..0574c9a 100644
--- a/crates/caldav/src/calendar/methods/post.rs
+++ b/crates/caldav/src/calendar/methods/post.rs
@@ -10,7 +10,7 @@ use tracing::instrument;
 use tracing_actix_web::RootSpan;
 
 #[instrument(parent = root_span.id(), skip(store, subscription_store, root_span, req))]
-pub async fn route_post<C: CalendarStore + ?Sized, S: SubscriptionStore + ?Sized>(
+pub async fn route_post<C: CalendarStore, S: SubscriptionStore>(
     path: Path<(String, String)>,
     body: String,
     user: User,
diff --git a/crates/caldav/src/calendar/methods/report/calendar_multiget.rs b/crates/caldav/src/calendar/methods/report/calendar_multiget.rs
index aaf0778..46faa19 100644
--- a/crates/caldav/src/calendar/methods/report/calendar_multiget.rs
+++ b/crates/caldav/src/calendar/methods/report/calendar_multiget.rs
@@ -24,7 +24,7 @@ pub(crate) struct CalendarMultigetRequest {
     pub(crate) href: Vec<String>,
 }
 
-pub async fn get_objects_calendar_multiget<C: CalendarStore + ?Sized>(
+pub async fn get_objects_calendar_multiget<C: CalendarStore>(
     cal_query: &CalendarMultigetRequest,
     path: &str,
     principal: &str,
@@ -52,7 +52,7 @@ pub async fn get_objects_calendar_multiget<C: CalendarStore + ?Sized>(
     Ok((result, not_found))
 }
 
-pub async fn handle_calendar_multiget<C: CalendarStore + ?Sized>(
+pub async fn handle_calendar_multiget<C: CalendarStore>(
     cal_multiget: CalendarMultigetRequest,
     req: HttpRequest,
     user: &User,
diff --git a/crates/caldav/src/calendar/methods/report/calendar_query.rs b/crates/caldav/src/calendar/methods/report/calendar_query.rs
index 6d8e127..a584076 100644
--- a/crates/caldav/src/calendar/methods/report/calendar_query.rs
+++ b/crates/caldav/src/calendar/methods/report/calendar_query.rs
@@ -175,7 +175,7 @@ pub struct CalendarQueryRequest {
     pub(crate) timezone_id: Option<String>,
 }
 
-pub async fn get_objects_calendar_query<C: CalendarStore + ?Sized>(
+pub async fn get_objects_calendar_query<C: CalendarStore>(
     cal_query: &CalendarQueryRequest,
     principal: &str,
     cal_id: &str,
@@ -188,7 +188,7 @@ pub async fn get_objects_calendar_query<C: CalendarStore + ?Sized>(
     Ok(objects)
 }
 
-pub async fn handle_calendar_query<C: CalendarStore + ?Sized>(
+pub async fn handle_calendar_query<C: CalendarStore>(
     cal_query: CalendarQueryRequest,
     req: HttpRequest,
     user: &User,
diff --git a/crates/caldav/src/calendar/methods/report/mod.rs b/crates/caldav/src/calendar/methods/report/mod.rs
index 8e6d6ed..ea338eb 100644
--- a/crates/caldav/src/calendar/methods/report/mod.rs
+++ b/crates/caldav/src/calendar/methods/report/mod.rs
@@ -22,7 +22,7 @@ pub(crate) enum ReportRequest {
 }
 
 #[instrument(skip(req, cal_store))]
-pub async fn route_report_calendar<C: CalendarStore + ?Sized>(
+pub async fn route_report_calendar<C: CalendarStore>(
     path: Path<(String, String)>,
     body: String,
     user: User,
diff --git a/crates/caldav/src/calendar/methods/report/sync_collection.rs b/crates/caldav/src/calendar/methods/report/sync_collection.rs
index 5227dda..adf5156 100644
--- a/crates/caldav/src/calendar/methods/report/sync_collection.rs
+++ b/crates/caldav/src/calendar/methods/report/sync_collection.rs
@@ -60,7 +60,7 @@ pub(crate) struct SyncCollectionRequest {
     pub(crate) limit: Option<u64>,
 }
 
-pub async fn handle_sync_collection<C: CalendarStore + ?Sized>(
+pub async fn handle_sync_collection<C: CalendarStore>(
     sync_collection: SyncCollectionRequest,
     req: HttpRequest,
     user: &User,
diff --git a/crates/caldav/src/calendar/resource.rs b/crates/caldav/src/calendar/resource.rs
index 53be000..1ddd4c4 100644
--- a/crates/caldav/src/calendar/resource.rs
+++ b/crates/caldav/src/calendar/resource.rs
@@ -255,12 +255,12 @@ impl Resource for CalendarResource {
     }
 }
 
-pub struct CalendarResourceService<C: CalendarStore + ?Sized, S: SubscriptionStore + ?Sized> {
+pub struct CalendarResourceService<C: CalendarStore, S: SubscriptionStore> {
     cal_store: Arc<C>,
     __phantom_sub: PhantomData<S>,
 }
 
-impl<C: CalendarStore + ?Sized, S: SubscriptionStore + ?Sized> CalendarResourceService<C, S> {
+impl<C: CalendarStore, S: SubscriptionStore> CalendarResourceService<C, S> {
     pub fn new(cal_store: Arc<C>) -> Self {
         Self {
             cal_store,
@@ -270,7 +270,7 @@ impl<C: CalendarStore + ?Sized, S: SubscriptionStore + ?Sized> CalendarResourceS
 }
 
 #[async_trait(?Send)]
-impl<C: CalendarStore + ?Sized, S: SubscriptionStore + ?Sized> ResourceService
+impl<C: CalendarStore, S: SubscriptionStore> ResourceService
     for CalendarResourceService<C, S>
 {
     type MemberType = CalendarObjectResource;
diff --git a/crates/caldav/src/calendar_object/methods.rs b/crates/caldav/src/calendar_object/methods.rs
index aa38c4b..d60ac15 100644
--- a/crates/caldav/src/calendar_object/methods.rs
+++ b/crates/caldav/src/calendar_object/methods.rs
@@ -12,7 +12,7 @@ use tracing_actix_web::RootSpan;
 use super::resource::CalendarObjectPathComponents;
 
 #[instrument(parent = root_span.id(), skip(store, root_span))]
-pub async fn get_event<C: CalendarStore + ?Sized>(
+pub async fn get_event<C: CalendarStore>(
     path: Path<CalendarObjectPathComponents>,
     store: Data<C>,
     user: User,
@@ -42,7 +42,7 @@ pub async fn get_event<C: CalendarStore + ?Sized>(
 }
 
 #[instrument(parent = root_span.id(), skip(store, req, root_span))]
-pub async fn put_event<C: CalendarStore + ?Sized>(
+pub async fn put_event<C: CalendarStore>(
     path: Path<CalendarObjectPathComponents>,
     store: Data<C>,
     body: String,
diff --git a/crates/caldav/src/calendar_object/resource.rs b/crates/caldav/src/calendar_object/resource.rs
index bbf0442..1200370 100644
--- a/crates/caldav/src/calendar_object/resource.rs
+++ b/crates/caldav/src/calendar_object/resource.rs
@@ -14,11 +14,11 @@ use serde::Deserialize;
 use std::sync::Arc;
 use strum::{EnumDiscriminants, EnumString, IntoStaticStr, VariantNames};
 
-pub struct CalendarObjectResourceService<C: CalendarStore + ?Sized> {
+pub struct CalendarObjectResourceService<C: CalendarStore> {
     cal_store: Arc<C>,
 }
 
-impl<C: CalendarStore + ?Sized> CalendarObjectResourceService<C> {
+impl<C: CalendarStore> CalendarObjectResourceService<C> {
     pub fn new(cal_store: Arc<C>) -> Self {
         Self { cal_store }
     }
@@ -110,7 +110,7 @@ impl<'de> Deserialize<'de> for CalendarObjectPathComponents {
 }
 
 #[async_trait(?Send)]
-impl<C: CalendarStore + ?Sized> ResourceService for CalendarObjectResourceService<C> {
+impl<C: CalendarStore> ResourceService for CalendarObjectResourceService<C> {
     type PathComponents = CalendarObjectPathComponents;
     type Resource = CalendarObjectResource;
     type MemberType = CalendarObjectResource;
diff --git a/crates/caldav/src/calendar_set/mod.rs b/crates/caldav/src/calendar_set/mod.rs
index 2f7acee..01c71ef 100644
--- a/crates/caldav/src/calendar_set/mod.rs
+++ b/crates/caldav/src/calendar_set/mod.rs
@@ -67,18 +67,18 @@ impl Resource for CalendarSetResource {
     }
 }
 
-pub struct CalendarSetResourceService<C: CalendarStore + ?Sized> {
+pub struct CalendarSetResourceService<C: CalendarStore> {
     cal_store: Arc<C>,
 }
 
-impl<C: CalendarStore + ?Sized> CalendarSetResourceService<C> {
+impl<C: CalendarStore> CalendarSetResourceService<C> {
     pub fn new(cal_store: Arc<C>) -> Self {
         Self { cal_store }
     }
 }
 
 #[async_trait(?Send)]
-impl<C: CalendarStore + ?Sized> ResourceService for CalendarSetResourceService<C> {
+impl<C: CalendarStore> ResourceService for CalendarSetResourceService<C> {
     type PathComponents = (String,);
     type MemberType = CalendarResource;
     type Resource = CalendarSetResource;
diff --git a/crates/caldav/src/lib.rs b/crates/caldav/src/lib.rs
index 93d06ec..03ee7ba 100644
--- a/crates/caldav/src/lib.rs
+++ b/crates/caldav/src/lib.rs
@@ -30,9 +30,9 @@ pub fn configure_well_known(cfg: &mut web::ServiceConfig, caldav_root: String) {
 
 pub fn configure_dav<
     AP: AuthenticationProvider,
-    AS: AddressbookStore + ?Sized,
-    C: CalendarStore + ?Sized,
-    S: SubscriptionStore + ?Sized,
+    AS: AddressbookStore,
+    C: CalendarStore,
+    S: SubscriptionStore,
 >(
     cfg: &mut web::ServiceConfig,
     auth_provider: Arc<AP>,
diff --git a/crates/caldav/src/subscription.rs b/crates/caldav/src/subscription.rs
index f948150..829e4e7 100644
--- a/crates/caldav/src/subscription.rs
+++ b/crates/caldav/src/subscription.rs
@@ -8,7 +8,7 @@ use rustical_xml::{XmlRootTag, XmlSerialize};
 
 use crate::calendar::resource::CalendarProp;
 
-async fn handle_delete<S: SubscriptionStore + ?Sized>(
+async fn handle_delete<S: SubscriptionStore>(
     store: Data<S>,
     path: Path<String>,
 ) -> Result<HttpResponse, rustical_store::Error> {
@@ -17,7 +17,7 @@ async fn handle_delete<S: SubscriptionStore + ?Sized>(
     Ok(HttpResponse::NoContent().body("Unregistered"))
 }
 
-pub fn subscription_resource<S: SubscriptionStore + ?Sized>() -> actix_web::Resource {
+pub fn subscription_resource<S: SubscriptionStore>() -> actix_web::Resource {
     web::resource("/subscription/{id}")
         .name("subscription")
         .delete(handle_delete::<S>)
diff --git a/crates/carddav/src/address_object/methods.rs b/crates/carddav/src/address_object/methods.rs
index 4b6fd2c..fe64edf 100644
--- a/crates/carddav/src/address_object/methods.rs
+++ b/crates/carddav/src/address_object/methods.rs
@@ -11,7 +11,7 @@ use tracing::instrument;
 use tracing_actix_web::RootSpan;
 
 #[instrument(parent = root_span.id(), skip(store, root_span))]
-pub async fn get_object<AS: AddressbookStore + ?Sized>(
+pub async fn get_object<AS: AddressbookStore>(
     path: Path<AddressObjectPathComponents>,
     store: Data<AS>,
     user: User,
@@ -43,7 +43,7 @@ pub async fn get_object<AS: AddressbookStore + ?Sized>(
 }
 
 #[instrument(parent = root_span.id(), skip(store, req, root_span))]
-pub async fn put_object<AS: AddressbookStore + ?Sized>(
+pub async fn put_object<AS: AddressbookStore>(
     path: Path<AddressObjectPathComponents>,
     store: Data<AS>,
     body: String,
diff --git a/crates/carddav/src/address_object/resource.rs b/crates/carddav/src/address_object/resource.rs
index 71af2a8..d586f73 100644
--- a/crates/carddav/src/address_object/resource.rs
+++ b/crates/carddav/src/address_object/resource.rs
@@ -1,7 +1,7 @@
 use crate::{principal::PrincipalResource, Error};
 use actix_web::dev::ResourceMap;
 use async_trait::async_trait;
-use derive_more::derive::{From, Into};
+use derive_more::derive::{Constructor, From, Into};
 use rustical_dav::{
     privileges::UserPrivilegeSet,
     resource::{Resource, ResourceService},
@@ -15,16 +15,11 @@ use strum::{EnumDiscriminants, EnumString, IntoStaticStr, VariantNames};
 
 use super::methods::{get_object, put_object};
 
-pub struct AddressObjectResourceService<AS: AddressbookStore + ?Sized> {
+#[derive(Constructor)]
+pub struct AddressObjectResourceService<AS: AddressbookStore> {
     addr_store: Arc<AS>,
 }
 
-impl<A: AddressbookStore + ?Sized> AddressObjectResourceService<A> {
-    pub fn new(addr_store: Arc<A>) -> Self {
-        Self { addr_store }
-    }
-}
-
 #[derive(XmlDeserialize, XmlSerialize, PartialEq, EnumDiscriminants, Clone)]
 #[strum_discriminants(
     name(AddressObjectPropName),
@@ -111,7 +106,7 @@ impl<'de> Deserialize<'de> for AddressObjectPathComponents {
 }
 
 #[async_trait(?Send)]
-impl<AS: AddressbookStore + ?Sized> ResourceService for AddressObjectResourceService<AS> {
+impl<AS: AddressbookStore> ResourceService for AddressObjectResourceService<AS> {
     type PathComponents = AddressObjectPathComponents;
     type Resource = AddressObjectResource;
     type MemberType = AddressObjectResource;
diff --git a/crates/carddav/src/addressbook/methods/mkcol.rs b/crates/carddav/src/addressbook/methods/mkcol.rs
index 46584da..6ba2fa0 100644
--- a/crates/carddav/src/addressbook/methods/mkcol.rs
+++ b/crates/carddav/src/addressbook/methods/mkcol.rs
@@ -32,7 +32,7 @@ struct MkcolRequest {
 }
 
 #[instrument(parent = root_span.id(), skip(store, root_span))]
-pub async fn route_mkcol<AS: AddressbookStore + ?Sized>(
+pub async fn route_mkcol<AS: AddressbookStore>(
     path: Path<(String, String)>,
     body: String,
     user: User,
diff --git a/crates/carddav/src/addressbook/methods/post.rs b/crates/carddav/src/addressbook/methods/post.rs
index af65569..1778a7a 100644
--- a/crates/carddav/src/addressbook/methods/post.rs
+++ b/crates/carddav/src/addressbook/methods/post.rs
@@ -10,7 +10,7 @@ use tracing::instrument;
 use tracing_actix_web::RootSpan;
 
 #[instrument(parent = root_span.id(), skip(store, subscription_store, root_span, req))]
-pub async fn route_post<A: AddressbookStore + ?Sized, S: SubscriptionStore + ?Sized>(
+pub async fn route_post<A: AddressbookStore, S: SubscriptionStore>(
     path: Path<(String, String)>,
     body: String,
     user: User,
diff --git a/crates/carddav/src/addressbook/methods/report/addressbook_multiget.rs b/crates/carddav/src/addressbook/methods/report/addressbook_multiget.rs
index e4827d3..3d6742f 100644
--- a/crates/carddav/src/addressbook/methods/report/addressbook_multiget.rs
+++ b/crates/carddav/src/addressbook/methods/report/addressbook_multiget.rs
@@ -23,7 +23,7 @@ pub struct AddressbookMultigetRequest {
     href: Vec<String>,
 }
 
-pub async fn get_objects_addressbook_multiget<AS: AddressbookStore + ?Sized>(
+pub async fn get_objects_addressbook_multiget<AS: AddressbookStore>(
     addressbook_multiget: &AddressbookMultigetRequest,
     path: &str,
     principal: &str,
@@ -52,7 +52,7 @@ pub async fn get_objects_addressbook_multiget<AS: AddressbookStore + ?Sized>(
     Ok((result, not_found))
 }
 
-pub async fn handle_addressbook_multiget<AS: AddressbookStore + ?Sized>(
+pub async fn handle_addressbook_multiget<AS: AddressbookStore>(
     addr_multiget: AddressbookMultigetRequest,
     req: HttpRequest,
     user: &User,
diff --git a/crates/carddav/src/addressbook/methods/report/mod.rs b/crates/carddav/src/addressbook/methods/report/mod.rs
index 6bd1a98..40f57bd 100644
--- a/crates/carddav/src/addressbook/methods/report/mod.rs
+++ b/crates/carddav/src/addressbook/methods/report/mod.rs
@@ -19,7 +19,7 @@ pub(crate) enum ReportRequest {
 }
 
 #[instrument(skip(req, addr_store))]
-pub async fn route_report_addressbook<AS: AddressbookStore + ?Sized>(
+pub async fn route_report_addressbook<AS: AddressbookStore>(
     path: Path<(String, String)>,
     body: String,
     user: User,
diff --git a/crates/carddav/src/addressbook/methods/report/sync_collection.rs b/crates/carddav/src/addressbook/methods/report/sync_collection.rs
index d1888ba..80e204d 100644
--- a/crates/carddav/src/addressbook/methods/report/sync_collection.rs
+++ b/crates/carddav/src/addressbook/methods/report/sync_collection.rs
@@ -56,7 +56,7 @@ pub(crate) struct SyncCollectionRequest {
     pub(crate) limit: Option<u64>,
 }
 
-pub async fn handle_sync_collection<AS: AddressbookStore + ?Sized>(
+pub async fn handle_sync_collection<AS: AddressbookStore>(
     sync_collection: SyncCollectionRequest,
     req: HttpRequest,
     user: &User,
diff --git a/crates/carddav/src/addressbook/resource.rs b/crates/carddav/src/addressbook/resource.rs
index 3b99fb0..4f4fd2a 100644
--- a/crates/carddav/src/addressbook/resource.rs
+++ b/crates/carddav/src/addressbook/resource.rs
@@ -22,13 +22,13 @@ use std::str::FromStr;
 use std::sync::Arc;
 use strum::{EnumDiscriminants, EnumString, IntoStaticStr, VariantNames};
 
-pub struct AddressbookResourceService<AS: AddressbookStore + ?Sized, S: SubscriptionStore + ?Sized>
+pub struct AddressbookResourceService<AS: AddressbookStore, S: SubscriptionStore>
 {
     addr_store: Arc<AS>,
     __phantom_sub: PhantomData<S>,
 }
 
-impl<A: AddressbookStore + ?Sized, S: SubscriptionStore + ?Sized> AddressbookResourceService<A, S> {
+impl<A: AddressbookStore, S: SubscriptionStore> AddressbookResourceService<A, S> {
     pub fn new(addr_store: Arc<A>) -> Self {
         Self {
             addr_store,
@@ -174,7 +174,7 @@ impl Resource for AddressbookResource {
 }
 
 #[async_trait(?Send)]
-impl<AS: AddressbookStore + ?Sized, S: SubscriptionStore + ?Sized> ResourceService
+impl<AS: AddressbookStore, S: SubscriptionStore> ResourceService
     for AddressbookResourceService<AS, S>
 {
     type MemberType = AddressObjectResource;
diff --git a/crates/carddav/src/lib.rs b/crates/carddav/src/lib.rs
index 94cbccc..c1309e2 100644
--- a/crates/carddav/src/lib.rs
+++ b/crates/carddav/src/lib.rs
@@ -29,11 +29,7 @@ pub fn configure_well_known(cfg: &mut web::ServiceConfig, carddav_root: String)
     cfg.service(web::redirect("/carddav", carddav_root).permanent());
 }
 
-pub fn configure_dav<
-    AP: AuthenticationProvider,
-    A: AddressbookStore + ?Sized,
-    S: SubscriptionStore + ?Sized,
->(
+pub fn configure_dav<AP: AuthenticationProvider, A: AddressbookStore, S: SubscriptionStore>(
     cfg: &mut web::ServiceConfig,
     auth_provider: Arc<AP>,
     store: Arc<A>,
diff --git a/crates/carddav/src/principal/mod.rs b/crates/carddav/src/principal/mod.rs
index b0c3e0c..9d038e2 100644
--- a/crates/carddav/src/principal/mod.rs
+++ b/crates/carddav/src/principal/mod.rs
@@ -11,11 +11,11 @@ use rustical_xml::{XmlDeserialize, XmlSerialize};
 use std::sync::Arc;
 use strum::{EnumDiscriminants, EnumString, IntoStaticStr, VariantNames};
 
-pub struct PrincipalResourceService<A: AddressbookStore + ?Sized> {
+pub struct PrincipalResourceService<A: AddressbookStore> {
     addr_store: Arc<A>,
 }
 
-impl<A: AddressbookStore + ?Sized> PrincipalResourceService<A> {
+impl<A: AddressbookStore> PrincipalResourceService<A> {
     pub fn new(addr_store: Arc<A>) -> Self {
         Self { addr_store }
     }
@@ -102,7 +102,7 @@ impl Resource for PrincipalResource {
 }
 
 #[async_trait(?Send)]
-impl<A: AddressbookStore + ?Sized> ResourceService for PrincipalResourceService<A> {
+impl<A: AddressbookStore> ResourceService for PrincipalResourceService<A> {
     type PathComponents = (String,);
     type MemberType = AddressbookResource;
     type Resource = PrincipalResource;
diff --git a/crates/frontend/src/lib.rs b/crates/frontend/src/lib.rs
index 0589323..a835772 100644
--- a/crates/frontend/src/lib.rs
+++ b/crates/frontend/src/lib.rs
@@ -39,7 +39,7 @@ struct UserPage {
     pub deleted_addressbooks: Vec<Addressbook>,
 }
 
-async fn route_user<CS: CalendarStore + ?Sized, AS: AddressbookStore + ?Sized>(
+async fn route_user<CS: CalendarStore, AS: AddressbookStore>(
     path: Path<String>,
     cal_store: Data<CS>,
     addr_store: Data<AS>,
@@ -99,11 +99,7 @@ fn unauthorized_handler<B>(res: ServiceResponse<B>) -> actix_web::Result<ErrorHa
     Ok(ErrorHandlerResponse::Response(res))
 }
 
-pub fn configure_frontend<
-    AP: AuthenticationProvider,
-    CS: CalendarStore + ?Sized,
-    AS: AddressbookStore + ?Sized,
->(
+pub fn configure_frontend<AP: AuthenticationProvider, CS: CalendarStore, AS: AddressbookStore>(
     cfg: &mut web::ServiceConfig,
     auth_provider: Arc<AP>,
     cal_store: Arc<CS>,
diff --git a/crates/frontend/src/routes/addressbook.rs b/crates/frontend/src/routes/addressbook.rs
index a2b7a8c..0f61923 100644
--- a/crates/frontend/src/routes/addressbook.rs
+++ b/crates/frontend/src/routes/addressbook.rs
@@ -12,7 +12,7 @@ struct AddressbookPage {
     addressbook: Addressbook,
 }
 
-pub async fn route_addressbook<AS: AddressbookStore + ?Sized>(
+pub async fn route_addressbook<AS: AddressbookStore>(
     path: Path<(String, String)>,
     store: Data<AS>,
     _user: User,
@@ -23,7 +23,7 @@ pub async fn route_addressbook<AS: AddressbookStore + ?Sized>(
     })
 }
 
-pub async fn route_addressbook_restore<AS: AddressbookStore + ?Sized>(
+pub async fn route_addressbook_restore<AS: AddressbookStore>(
     path: Path<(String, String)>,
     req: HttpRequest,
     store: Data<AS>,
diff --git a/crates/frontend/src/routes/calendar.rs b/crates/frontend/src/routes/calendar.rs
index ae92eac..931b5e4 100644
--- a/crates/frontend/src/routes/calendar.rs
+++ b/crates/frontend/src/routes/calendar.rs
@@ -12,7 +12,7 @@ struct CalendarPage {
     calendar: Calendar,
 }
 
-pub async fn route_calendar<C: CalendarStore + ?Sized>(
+pub async fn route_calendar<C: CalendarStore>(
     path: Path<(String, String)>,
     store: Data<C>,
     _user: User,
@@ -23,7 +23,7 @@ pub async fn route_calendar<C: CalendarStore + ?Sized>(
     })
 }
 
-pub async fn route_calendar_restore<CS: CalendarStore + ?Sized>(
+pub async fn route_calendar_restore<CS: CalendarStore>(
     path: Path<(String, String)>,
     req: HttpRequest,
     store: Data<CS>,
diff --git a/crates/store/src/contact_birthday_store.rs b/crates/store/src/contact_birthday_store.rs
index c3e93c0..1701ece 100644
--- a/crates/store/src/contact_birthday_store.rs
+++ b/crates/store/src/contact_birthday_store.rs
@@ -8,7 +8,7 @@ use derive_more::derive::Constructor;
 use sha2::{Digest, Sha256};
 
 #[derive(Constructor, Clone)]
-pub struct ContactBirthdayStore<AS: AddressbookStore + ?Sized>(Arc<AS>);
+pub struct ContactBirthdayStore<AS: AddressbookStore>(Arc<AS>);
 
 fn birthday_calendar(addressbook: Addressbook) -> Calendar {
     Calendar {
@@ -35,7 +35,7 @@ fn birthday_calendar(addressbook: Addressbook) -> Calendar {
 }
 
 #[async_trait]
-impl<AS: AddressbookStore + ?Sized> CalendarStore for ContactBirthdayStore<AS> {
+impl<AS: AddressbookStore> CalendarStore for ContactBirthdayStore<AS> {
     async fn get_calendar(&self, principal: &str, id: &str) -> Result<Calendar, Error> {
         let addressbook = self.0.get_addressbook(principal, id).await?;
         Ok(birthday_calendar(addressbook))
diff --git a/src/app.rs b/src/app.rs
index df8623d..bf9e9a9 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -8,11 +8,7 @@ use rustical_store::{AddressbookStore, CalendarStore, SubscriptionStore};
 use std::sync::Arc;
 use tracing_actix_web::TracingLogger;
 
-pub fn make_app<
-    AS: AddressbookStore + ?Sized,
-    CS: CalendarStore + ?Sized,
-    S: SubscriptionStore + ?Sized,
->(
+pub fn make_app<AS: AddressbookStore, CS: CalendarStore, S: SubscriptionStore>(
     addr_store: Arc<AS>,
     cal_store: Arc<CS>,
     subscription_store: Arc<S>,
diff --git a/src/main.rs b/src/main.rs
index d292af5..71ad0b2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -46,9 +46,9 @@ async fn get_data_stores(
     migrate: bool,
     config: &DataStoreConfig,
 ) -> Result<(
-    Arc<dyn AddressbookStore>,
-    Arc<dyn CalendarStore>,
-    Arc<dyn SubscriptionStore>,
+    Arc<impl AddressbookStore>,
+    Arc<impl CalendarStore>,
+    Arc<impl SubscriptionStore>,
     Receiver<CollectionOperation>,
 )> {
     Ok(match &config {